25 results on '"Lv, Yi"'
Search Results
2. Recent advances in chemiluminescence and cataluminescence for the detection of volatile sulfur compounds.
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Pu, Sirui, Pan, Yi, Zhang, Lichun, and Lv, Yi
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CHEMILUMINESCENCE ,GAS detectors ,SULFUR compounds ,POLLUTION ,HEALTH products - Abstract
The emission of volatile sulfur compounds (VSCs) could cause environmental pollution, low-grade products and human health risks. Accordingly, it is of great significance to establish some sensitive and convenient analytical methods for their identification and determination. With the advantages of fast response, high sensitivity and simple instrument, chemiluminescence (CL) and cataluminescence (CTL) are promising for the detection of VSCs. So far, CL analysis of VSCs has been widely applied in various fields based on auxiliary CL methods and sulfur chemiluminescence detector (SCD), while CTL detection is prosperous in the construction of gas sensors, including the exploration of sensing materials and detection modes. Herein, this mini review briefly summarized the progresses, difficulties and future developments of CL analysis and CTL sensor in the detection of VSCs. [ABSTRACT FROM AUTHOR]
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- 2023
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3. Recent advances in cataluminescence gas sensor: Materials and methodologies.
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Hu, Jiaxi, Zhang, Lichun, and Lv, Yi
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CATALYTIC oxidation ,DETECTORS ,MATERIALS ,CHEMILUMINESCENCE ,HETEROGENEOUS catalysts - Abstract
Cataluminescence (CTL), one kind of the chemiluminescence, generates on the surface of solid catalyst during a heterogeneous catalytic oxidation reaction with the advantages of high sensitivity, fast response, simple instrument and longtime stability. This review provides the advances in CTL, mainly discussed the developments of sensing materials, detection technologies and application of CTL in recent 3 years. Also, we proposed various prospects and expectations of CTL-based sensor system at the end of this paper. [ABSTRACT FROM AUTHOR]
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- 2019
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4. Cataluminescence sensing of carbon disulfide based on CeO2 hierarchical hollow microspheres.
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Cai, Pingyang, Yi, Xiaofeng, Song, Hongjie, and Lv, Yi
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CARBON disulfide ,CERIUM oxides ,GAS detectors ,MICROSPHERES ,CHEMICAL reactions - Abstract
Material morphology-dependent cataluminescence (CTL) sensing characteristic and application are presented in this work. Hierarchical hollow microspheres CeO
2 were synthesized via the hydrothermal reaction of glucose and N, N-dimethyl-formamide (Glu-DMF). SEM, XRD, TEM, HRTEM and BET were used to characterize the prepared CeO2 materials. Compared with CeO2 cubics (CeO2 Cubs), CeO2 hierarchical hollow microspheres (CeO2 HMs) show an enhanced CTL response to carbon disulfide. The response and recovery times of CeO2 HMs-based CTL sensor towards carbon disulfide are about 8 s and 20 s, respectively. CeO2 HMs exhibits a linear CTL response to carbon disulfide in the concentration range of 0.50~10 μg•mL-1 with an excellent sensitivity and selectivity. These results suggest that CeO2 HMs will be a highly promising CTL sensing material for the detection and monitoring carbon disulfide.CeO2 hierarchical hollow microspheres (CeO2 HMs) were synthesized via the hydrothermal reaction of glucose and N, N-dimethyl-formamide (Glu-DMF). Meanwhile, the prepared CeO2 HMs shows commendable CTL response towards carbon disulfide. Due to the excellent analytical performance of designed CeO2 HMs-based sensor for carbon disulfide, it has potential application value in various locations[ABSTRACT FROM AUTHOR]
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- 2018
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5. Recent Progress in Chemiluminescence for Gas Analysis.
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Zhang, Lichun, Hu, Jing, Lv, Yi, and Hou, Xiandeng
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CHEMILUMINESCENCE ,GAS analysis ,OZONE ,SPECTRUM analysis ,DETECTORS ,ELECTRIC discharges - Abstract
Chemiluminescence is frequently used as a powerful analytical tool for gas analysis. In this mini-review with 102 references, we summarize the recent advances in chemiluminescence-based analytical methodologies and their application in gas/volatile species analysis, mainly including applications of ozone-induced chemiluminescence, cataluminescence-based gas sensors and arrays, and dielectric barrier discharge-induced chemiluminescence for gas analysis. Efforts in the innovation of the methodologies, the exploration of new sensing materials, and the mechanism studies are discussed in detail. [ABSTRACT FROM AUTHOR]
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- 2010
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6. A new alcohols sensor based on cataluminescence on nano-CdS.
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Jiao, Xue, Zhang, Lichun, Lv, Yi, and Su, Yingying
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CADMIUM selenide , *GAS detectors , *LUMINESCENCE spectroscopy , *NANOPARTICLES , *CATALYTIC activity , *OPTICAL interference - Abstract
Abstract: A novel and highly sensitive gas sensor for alcohols (methanol, ethanol, propanol, isopropanol, butanol, and isobutanol) was proposed based on cataluminescence (CTL) on the surface of nano-CdS. Using cetrimonium bromide (CTAB) as template, the nano-sized sensing material CdS was successfully obtained by a simple hydrothermal synthesis process. The luminescence characteristics and the experiment conditions were investigated in detail. Under the optimized conditions, little interference was observed while eleven foreign substances were passing through the sensor. It demonstrated that this gas sensor has high selectivity for alcohols. The calibration curve (y = kx + b) of the relative CTL intensity versus the concentration of methanol was made, with the linear range of 1.2–76.1μgmL−1 and the detection limit of 0.5μgmL−1 (S/N=3). The relative standard deviation (R.S.D.) (n =7) of relative cataluminescence intensity for 58.5μgmL−1 methanol was 4.3%. There was no significant change of the catalytic activity of the sensor for a week, with R.S.D. less than 5% by collecting the CTL intensity every hour. The method can be applied to detect alcohols in the air. The possible mechanism of CTL on the surface of nano-CdS was discussed preliminarily. [Copyright &y& Elsevier]
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- 2013
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7. Cataluminescence gas sensor for ketones based on nanosized NaYF4:Er.
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Tang, Jie, Song, Hongjie, Zeng, Binrong, Zhang, Lichun, and Lv, Yi
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LUMINESCENCE , *GAS detectors , *KETONES , *METAL nanoparticles , *SODIUM compounds , *ERBIUM - Abstract
A novel gas sensor toward ketones based on cataluminescence generated on the surface of nanosized NaYF 4 :Er was developed. The sensing materials NaYF 4 :Er was synthesized by a simple hydrothermal method and characterized by powder X-ray diffraction, scanning electron microscope and energy dispersive X-ray spectroscopy. The effect of Er 3+ doping concentration and crystallinity of NaYF 4 :Er on the CTL intensity were studied. When the Er 3+ doping concentration reaches 20%, the materials show excellent sensing characteristics for ketones. Under the optimal experimental conditions, as represented by the acetone and butanone, the gas sensor has fast responses (3 s) and relatively low work temperature (250 °C). The linear range of cataluminescence intensity versus concentration were 2.388–143.28 μg mL −1 for acetone and 2.45–49.0 μg mL −1 for butanone, with a detection limit (signal-to-noise ratio is 3) of 1.7 μg mL −1 and 0.7 μg mL −1 , respectively. Foreign 11 substances in common have little interference which indicates the high selectivity of the CTL sensor for ketones. [ABSTRACT FROM AUTHOR]
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- 2016
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8. Novel metal-organic frameworks-based hydrogen sulfide cataluminescence sensors.
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Wan, Xiangyu, Wu, Liqian, Zhang, Lichun, Song, Hongjie, and Lv, Yi
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METAL-organic frameworks , *HYDROGEN sulfide , *LUMINESCENCE spectroscopy , *CHEMISTRY experiments , *CALIBRATION - Abstract
In the present work, a novel H 2 S cataluminescence (CTL) sensor based on metal-organic frameworks (MOFs) was established. Four MOFs, including MIL-100(Fe), MIL-101(Cr), Zn 3 (BTC) 2 ·12H 2 O and ZIF-8 were tested as CTL sensing materials. Among them, MIL-100(Fe) showed high CTL intensity for H 2 S, but it would be damaged after CTL experiment. MIL-101(Cr) showed just a low CTL signal and also destructed after contacting with H 2 S. Excitingly, Zn 3 (BTC) 2 ·12H 2 O and ZIF-8 displayed good sensitivity and stability for H 2 S. Then, the CTL characteristics and optimal parameters of these two MOFs were investigated in detail and the possible CTL mechanism was also discussed. Under the optimized conditions, the calibration curves of CTL intensity versus H 2 S concentration have linear regression coefficients ( R ) of >0.99 at low concentration, which renders MOFs interesting candidates for constructing H 2 S CTL sensor. [ABSTRACT FROM AUTHOR]
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- 2015
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9. A novel Ce(IV)-MOF-based cataluminescence sensor for detection of hydrogen sulfide.
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Li, Qiuyan, Sun, Mingxia, Zhang, Lichun, Song, Hongjie, and Lv, Yi
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HYDROGEN detectors , *HYDROGEN sulfide , *GAS detectors , *DETECTION limit , *SURFACE area , *CATALYTIC activity - Abstract
Cataluminescence (CTL) was regarded as a simple and efficient sensing method and had made great contributions in gas sensing. Herein, a novel CTL sensor based on Ce(IV)-MOF was designed for detection of H 2 S. The sensor shows outstanding selectivity, high sensitivity and excellent stability in CTL towards H 2 S due to the large surface area and excellent stability of Ce(IV)-MOF. A good linear curve (R2 =0.997) between CTL intensity and H 2 S in the range of 1.04–21.0 μg/mL was obtained with the detection limit of 0.035 μg/mL. Besides, the investigation of the CTL mechanism provides more theoretical support for catalytic reaction. This work broadened the application field of MOF and provided a new clue for the development of catalytic materials in CTL. • Cataluminescence gas sensor with outstanding selectivity, high sensitivity and excellent stability towards H 2 S. • The CTL sensor has excellent thermal stability, porous structure, large surface area and high catalytic activity. • The catalytic oxidization and luminescence mechanism of H 2 S on Ce(Ⅳ)-MOF was investigated in detail. [ABSTRACT FROM AUTHOR]
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- 2022
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10. Fabrication of α-Fe2O3/g-C3N4 composites for cataluminescence sensing of H2S.
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Zeng, Binrong, Zhang, Lichun, Wan, Xiangyu, Song, Hongjie, and Lv, Yi
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NANOFABRICATION , *IRON oxides , *LUMINESCENCE spectroscopy , *IRON catalysts , *X-ray photoelectron spectroscopy , *CHEMICAL detectors - Abstract
α-Fe 2 O 3 /g-C 3 N 4 composites catalysts were prepared through a facile method of refluxing. Thermogravimetric analysis (TG), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) were employed to characterize the as prepared α-Fe 2 O 3 /g-C 3 N 4 , which displayed distinguished cataluminescence (CTL) properties in the process of detecting H 2 S gas. When the α-Fe 2 O 3 content in the composite reaches 5.97%, the most outstanding CTL responses are observed. Under the optimized conditions, the linear detection range of the H 2 S gas sensor was 0.88–7.01 μg mL −1 ( r = 0.998) with the detection limit of 0.5 μg mL −1 ( S / N = 3). Furthermore, the H 2 S gas sensor showed superior selectivity to H 2 S gas compared with other fourteen kinds of common volatile organic compounds (VOCs), as well as fast response (0.1 s) and recovery (0.6 s). These properties render α-Fe 2 O 3 /g-C 3 N 4 composite promising candidate for applications in various fields. [ABSTRACT FROM AUTHOR]
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- 2015
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11. Advances in nanomaterial-assisted cataluminescence and its sensing applications.
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Zhang, Lichun, Song, Hongjie, Su, Yingying, and Lv, Yi
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NANOSTRUCTURED materials , *ANALYTICAL chemistry , *GENETIC transduction , *REMOTE sensing , *VOLATILE organic compounds - Abstract
Cataluminescence (CTL) emitted on the surface of solid materials during a catalytic reaction is a very interesting phenomenon, which gives a novel, powerful tool for chemical analysis. Nanomaterial-assisted CTL is a promising transduction principle for gas sensing, and its main features of high sensitivity and long lifetime are also favorable for developing a wide array of analytical devices. This review summarizes advances in nanomaterial-assisted CTL methodologies, including the working mechanism, exploration of sensing materials, innovations in strategy and instrumentation, new types of CTL-based sensing system, and their application to analysis of complex gases and volatile organic compounds. Finally, we discuss some critical challenges and prospects in this field. [ABSTRACT FROM AUTHOR]
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- 2015
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12. A Y-doped metal-organic framework-based cataluminescence gas sensor for isobutanol.
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Wan, Xiangyu, Song, Hongjie, Zhao, Di, Zhang, Lichun, and Lv, Yi
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METAL-organic frameworks , *YTTRIUM , *DOPED semiconductors , *LUMINESCENCE , *GAS detectors , *ISOBUTANOL , *NITROGEN absorption & adsorption , *X-ray diffraction - Abstract
Abstract: In the present work, Y-doped metal-organic framework-5 (MOF-5) was synthesized by a simple solvothermal method and characterized by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy and nitrogen adsorption–desorption measurements, and firstly used as gas sensor materials based on cataluminescence (CTL). When isobutanol passed through the surface of the material, CTL emission was observed. The luminescence characteristics and optimal parameters were investigated in detail. Under the optimized conditions, the present gas sensor exhibited a linear range of 6.4–80.1mgL−1 toward isobutanol and with a limit of detection of 3.7mgL−1. The designed CTL sensor based on Y-doped MOF-5 shows no or weak sensing performance for foreign common volatile organic compounds. Moreover, compared with pure MOF-5, Y-doped MOF-5 exhibited a better CTL response to isobutanol under the same conditions. This work exploits a new application domain of metal-organic frameworks (MOFs). [Copyright &y& Elsevier]
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- 2014
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13. Cataluminescence on 2D WS2 nanosheets surface for H2S sensing.
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Zhou, Qin, Song, Hongjie, Sun, Tong, Zhang, Lichun, and Lv, Yi
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NANOSTRUCTURED materials , *GAS detectors , *TUNGSTEN trioxide , *TRANSITION metals , *LOW temperatures , *DETECTION limit , *SULFUR compounds - Abstract
In the present work, two-dimensional (2D) transition metal dichalcogenides (TMDs) WS 2 nanosheets, which was synthesized through simple ultrasonic-assisted liquid exfoliation, was used for constructing H 2 S CTL gas sensor for the first time. With respect to other H 2 S CTL gas sensors based on metal oxides and metal-free materials, this sensor based on WS 2 nanosheets is outstanding in H 2 S sensing with excellent properties at relative low temperature of 187 ℃. Furthermore, both of the response and recovery time are as fast as 0.2 s with linear range of 0.26–6.38 µg mL−1 (R2 =0.9933) and detection limit of 0.06 µg·mL−1 (S/N = 3). The characterization results showed that as-prepared WS 2 nanosheets had larger surface, richer edges and more sulfur defects by comparing with bulk WS 2 , which are beneficial for catalytic performance improving. Importantly, the possible mechanism is proposed. In detail, some amount of WO 3 were in-situ generated forming WS 2 /WO 3 hybrids, and WO 3 could keep exchange balance with WS 2 during H 2 S sensing attributed to repeatable S-O bonding exchange. This is crucial for the repeatability of the sensor. This work provides a new view for CTL gas sensing mechanism and may open a new avenue of applying TMDs in H 2 S CTL sensors. • Two-dimensional WS 2 nanosheets was applied to build H 2 S CTL sensor for the first time. • With respect to other H 2 S CTL sensors, this sensor not only reduce the sensing temperature as low as 187 ℃, but also overcome the drawback of poisoning of sulfur compounds. • The mechanism study showed WO 3 were in-situ generated and balanced coexist with WS 2 during H 2 S sensing may due to the repeatable O-S binding exchange, which is crucial to sensor repeatability. [ABSTRACT FROM AUTHOR]
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- 2022
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14. A cataluminescence gas sensor for triethylamine based on nanosized LaF3–CeO2
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Xu, Liu, Song, Hongjie, Hu, Jing, Lv, Yi, and Xu, Kailai
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GAS detectors , *LUMINESCENCE , *TRIETHYLAMINE , *NANOPARTICLES , *LANTHANUM compounds , *CATALYTIC oxidation , *CERIUM oxides , *SURFACE chemistry - Abstract
Abstract: A novel and highly sensitive gas sensor for triethylamine (TEA) was proposed based on its cataluminescence (CTL) from the catalytic oxidation on the surface of nano-sized LaF3–CeO2. The LaF3–CeO2 nanoparticles were successfully prepared by using a calcination method. The luminescence characteristics and the optimal conditions were investigated in detail. Under the optimal conditions, the present gas sensor exhibited a linear range of 0.9–54ppm, with a correlation coefficient (R) of 0.9987 and a limit of detection (S/N=3) of 0.2ppm. The relative standard deviation (R.S.D.) for 36.5ppm triethylamine was 4.3% (n =6). There was no significant change in the catalytic activity of the sensor after 6 days, with a R.S.D. less than 5%. The proposed triethylamine sensor showed the advantages of good sensitivity and high selectivity. [Copyright &y& Elsevier]
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- 2012
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15. Synthesis of Ag2Se nanomaterial by electrodeposition and its application as cataluminescence gas sensor material for carbon tetrachloride
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Xu, Shuxia, Zhang, Lichun, Zhang, Xinfeng, He, Chunlan, and Lv, Yi
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SILVER compounds , *NANOSTRUCTURED materials , *CARBON tetrachloride , *GAS detectors , *ELECTROFORMING , *SCANNING electron microscopy , *LUMINESCENCE , *X-ray photoelectron spectroscopy - Abstract
Abstract: In this paper, we presented a carbon tetrachloride gas sensor with strong cataluminescence response based on Ag2Se nanomaterial, which was synthesized via the electrodeposition on the surface of Al foil by directly using a non-aqueous dimethyl sulfoxide (DMSO) solution with CH3COOAg and SeCl4. The deposited Ag2Se material was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Then, the prepared Ag2Se material along with the Al foil substrate was employed to design the carbon tetrachloride gas sensor. Under the optimized conditions, the present gas sensor exhibited a broad linear range of 0.9–228μgmL−1, with a limit of detection of 0.3μgmL−1 (S/N=3). The proposed gas sensor showed good characteristics with high selectivity, fast response and long lifetime. [Copyright &y& Elsevier]
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- 2011
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16. A cataluminescence gas sensor based on nanosized V2O5 for tert-butyl mercaptan
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Zhang, Huili, Zhang, Lichun, Hu, Jing, Cai, Pingyang, and Lv, Yi
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LUMINESCENCE , *GAS detectors , *VANADIUM pentoxide , *THIOLS , *SULFUR compounds , *OXIDATION , *TEMPERATURE effect - Abstract
Abstract: This work proposed a gas sensor for the determination of tert-butyl mercaptan, one of the highly toxic volatile sulfur compounds, which was based on cataluminescence emission during its catalytic oxidation on the surface of nanosized V2O5. The cataluminescence characteristics and the optimum conditions, including the morphology of sensing material, the wavelength of cataluminescence emission, the oxygen flow rate and working temperature were investigated in detail. Under the optimized conditions, the calibration curve of the relative cataluminescence intensity versus the concentration of tert-butyl mercaptan vapor was made, with the linear range of 5.6–196μgmL−1 and the detection limit of 0.5μgmL−1 (S/N =3). The relative standard deviation (R.S.D.) (n =5) of relative cataluminescence intensity for 84μgmL−1 tert-butyl mercaptan was 3.6%. There is no or weak response to some common substances, such as formic acid, alcohol (methanol, ethanol, propanol, isopropanol, n-butanol, isoamyl alcohol), o-dichlorobenzene, acetonitrile, ethyl acetate, aldehyde (formaldehyde, acetaldehyde and propanal), 1,2-dichloroethane and ammonia. Furthermore, the proposed sensor was successfully used for determining tert-butyl mercaptan in four artificial samples, with a good recovery. The results demonstrated that the proposed gas sensor had a promising capability for the tert-butyl mercaptan in routine monitoring. [Copyright &y& Elsevier]
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- 2010
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17. An ethanol gas sensor using energy transfer cataluminescence on nanosized YVO4:Eu3+ surface
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Zhou, Qin, Zhang, Lichun, Fan, Hanyu, Wu, Lan, and Lv, Yi
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GAS detectors , *VANADATES , *ALCOHOL , *ENERGY transfer , *LUMINESCENCE , *RARE earth ions , *METALLIC surfaces , *NANOCRYSTALS - Abstract
Abstract: In the present work, a novel and highly sensitive gas sensor for ethanol was demonstrated based on the intensive cataluminescence emission on the surface of YVO4:Eu3+ luminescent nanocrystals. By a hydrothermal synthesis process with surfactant (PEG 4000), the rice-like sensing material (YVO4:Eu3+) was successfully obtained. Considering the cataluminescence spectra and the fluorescence spectra of YVO4:Eu3+ nanocrystals, an energy transfer mechanism from excited intermediates to the YVO4:Eu3+ nanocrystals was proposed. Under the optimized conditions, the present gas sensor exhibited a linear range of 0.2–31.5μgmL−1, with a limit of detection of 0.03μgmL−1 (S/N=3). The proposed gas sensor showed good characteristics with fast response, high sensitivity and good stability. [Copyright &y& Elsevier]
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- 2010
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18. A cataluminescence gas sensor for carbon tetrachloride based on nanosized ZnS
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Luo, Lan, Chen, He, Zhang, Lichun, Xu, Kailai, and Lv, Yi
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GAS detectors , *LUMINESCENCE , *CARBON tetrachloride , *ZINC sulfide , *OXIDATION , *NANOSTRUCTURED materials - Abstract
Abstract: A novel and sensitive gas sensor was proposed for the determination of carbon tetrachloride based on its cataluminescence (CTL) by oxidation in the air on the surface of nanosized ZnS. The luminescence characteristics and the optimal conditions were investigated in detail. Under the optimized conditions, the linear range of the CTL intensity versus the concentration of carbon tetrachloride was 0.4–114μgmL−1, with a correlation coefficient (R) of 0.9986 and a limit of detection (S/N=3) of 0.2μgmL−1. The relative standard deviation (R.S.D.) for 5.9μgmL−1 carbon tetrachloride was 2.9% (n =5). There was no or weak response to common foreign substances including methanol, ethanol, benzene, acetone, formaldehyde, acetaldehyde, dichloromethane, xylene, ammonia and trichloromethane. There was no significant change of the catalytic activity of the sensor for 40h over 4 days, with a R.S.D. of less than 5% by collecting the CTL intensity once an hour. The proposed method was simple and sensitive, with a potential of detecting carbon tetrachloride in environment and industry grounds. The possible mechanism was also discussed briefly. [Copyright &y& Elsevier]
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- 2009
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19. Development of sensitive carbon disulfide sensor by using its cataluminescence on nanosized-CeO2
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Xuan, Yuelan, Hu, Jing, Xu, Kailai, Hou, Xiandeng, and Lv, Yi
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GAS detectors , *CARBON disulfide , *CHEMILUMINESCENCE , *WAVELENGTHS , *HYDROGEN sulfide - Abstract
Abstract: When carbon disulfide (CS2) was passing through the surface of nanosized-CeO2 (nano-CeO2), strong chemiluminescence (CL) emission was observed. Based on this phenomenon, a novel sensitive gas sensor was demonstrated for the determination of CS2. The luminescence characteristics and optimal parameters, such as the morphology of the CeO2, wavelength, temperature and the flow rate of carrier gas, were investigated in detail. Under the optimal conditions, the CL intensity versus the concentration of CS2 was linear in the range of 0.9–12.6μgmL−1, with a linear correlation coefficient (R) of 0.999 and a limit of detection (S/N=3) of 3.7ngmL−1 for CS2. The relative standard deviation (R.S.D.) for the determination of 3.6μgmL−1 CS2 was 1.2% (n =5). There is no or weak response to foreign substances, such as alcohol (methanol, ethanol, and n-butanol), aldehyde (formaldehyde and acetaldehyde), acetone, ethyl acetate, chloroform, carbon tetrachloride, toluene, chlorobenzene, hexane and hydrogen sulfide. The stability and durability of the sensor were examined by sampling 7.2μgmL−1 CS2 vapor into the sensor everyday for 3h over two weeks, with a long-term R.S.D. of less than 6.0%. Finally, the proposed sensor was applied to the determination of CS2 in artificial air samples. [Copyright &y& Elsevier]
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- 2009
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20. Online evaluation of the catalytic performance of MnO2 and its application in H2S cataluminescence sensing.
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Pu, Sirui, Pan, Yi, Zhang, Lichun, and Lv, Yi
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CATALYSTS , *MANGANESE dioxide , *CATALYTIC oxidation , *REACTIVE oxygen species , *GAS detectors , *DETECTION limit - Abstract
As a catalyst widely used in industry, manganese dioxide (MnO 2) has different crystalline forms and shows excellent performance in catalytic reactions. Therefore, it is of significance to rapidly evaluate the catalytic performance of MnO 2 online. In this paper, a highly efficient evaluation method based on H 2 S cataluminescence (CTL) sensing was proposed for MnO 2 with different crystalline forms. Firstly, α-, β- and δ-MnO 2 were synthesized successfully and performed diacritical CTL behaviours in the catalytic oxidation of H 2 S. Based on these interesting phenomena, the catalytic performance of α-, β- and δ-MnO 2 was efficiently evaluated online through CTL method for the first time. Results showed that β-MnO 2 had the best catalytic oxidation performance, followed by α- and δ-MnO 2 , and the reactive oxygen species of MnO 2 was the most significant influencing factor. Subsequently, β-MnO 2 was selected to design a CTL sensor for H 2 S detection with a wide linear range (2.43–29.1 μg/mL) and a low limit of detection (LOD, S/N = 3, 0.280 μg/mL). This work not only provided a new and feasible method for online evaluation of the catalytic performance of materials, but also designed a CTL sensor for H 2 S determination with high selectivity and sensitivity. [Display omitted] • Cataluminescence was employed to evaluate materials and screen catalysts efficiently. • The correlation between structures and catalytic performances of MnO 2 was firstly investigated using H 2 S as the model gas. • β-MnO 2 was firstly selected to build a H 2 S CTL sensor with high sensitivity and selectivity. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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21. Sensitive and selective acetone sensor based on its cataluminescence from nano-La2O3 surface
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Tang, Li, Li, Yaming, Xu, Kailai, Hou, Xiandeng, and Lv, Yi
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ACETONE , *DETECTORS , *LUMINESCENCE , *AROMATIC compounds - Abstract
Abstract: In the present paper, a highly sensitive and selective sensor for acetone was demonstrated, which was based on intensive cataluminescence (CTL) emission on the surface of nano-sized La2O3. The CTL characteristics and the optimum conditions for the sensor, including La2O3 morphology, wavelength, working temperature, and airflow rate, were investigated in detail. Under the optimized conditions, the CTL intensity versus concentration of acetone was linear in the range of 0.19–140μgmL−1, with a correlation coefficient (r) of 0.9981 and a detection limit (signal-to-noise ratio is 3; and noise is the width of baseline) of 0.08μgmL−1. The relative standard deviation (R.S.D.) for 9.3μgmL−1 acetone (n =5) was 1.4%. There was no or weak response to common foreign substances, such as ammonia, toluene, benzene, formaldehyde, ethanol, methanol, ethyl acetate, and acetaldehyde. The gas sensor also exhibited good stability and durability for continuously introducing 19μgmL−1 acetone for 80h over 8 days, with a long-term R.S.D. less than 5%. [Copyright &y& Elsevier]
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- 2008
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22. Fluorine functionalized graphitic carbon nitride for cataluminescence sensing of H2S.
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Xiong, Suqin, Yan, Shuguang, Zhang, Lichun, and Lv, Yi
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NITRIDES , *FLUORINE , *ELECTRON density , *ELECTRONEGATIVITY , *DENSITY functional theory - Abstract
[Display omitted] • Fluorine functionalized graphitic carbon nitride (F-g-C 3 N 4) was successfully synthesized under mild and simple conditions. • F-g-C 3 N 4 -based CTL sensor exhibits lower LOD than metal-free-based sensors and equivalent sensitivity of metal-based sensors. • The CTL mechanism of H 2 S on F-g-C 3 N 4 and the role of fluorine were deeply explored by experiments and DFT. Graphitic carbon nitride, as an excellent metal-free catalyst, is a promising candidate for cataluminescence (CTL) sensing of H 2 S owing to its high sulfur tolerance, environmental friendliness and low cost. Herein, in view of inner chemical inertness and low special surface area of g-C 3 N 4 , fluorine with strong electronegativity was employed to adjust the electron density of g-C 3 N 4 to obtain fluorine functionalized graphitic carbon nitride (F-g-C 3 N 4) for H 2 S sensing. As expected, the CTL response of F-g-C 3 N 4 exhibits more than 30 times higher towards H 2 S by contrast with that of g-C 3 N 4. Results demonstrated that F-g-C 3 N 4 was more conducive to the adsorption of O 2 and H 2 S due to the enlarged special surface area, the easier formation of hydrogen bond and the changed electronic structure, which was also supported by density functional theory calculations. Additionally, the F-g-C 3 N 4 -based sensor exhibits as high sensitivity as that of metal catalyst-based sensors but a longer lifetime. Meanwhile, the F-g-C 3 N 4 -based sensor has much higher CTL responses in the range of 1.27∼64.00 μg mL−1, lower detection limit of 0.07 μg mL−1 when comparing with previously reported metal-free catalyst-based sensors. Undoubtedly, this work not only opened up a novel approach to improve the sensing performance of g-C 3 N 4 , but also proposed an efficient strategy for obtaining satisfying catalytic performance of other metal-free layered materials. [ABSTRACT FROM AUTHOR]
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- 2021
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23. Discrimination and Detection of Oxygenated Volatile Organic Compounds Utilizing Energy Transfer Cataluminescence of La2O2CO3:Eu3+.
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Pei, Xueyu, Pu, Sirui, Zhang, Lichun, and Lv, Yi
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ENERGY transfer , *VOLATILE organic compounds , *CHEMICAL detectors - Abstract
• A novel gas sensing principle based on the energy transfer cataluminescence phenomenon. • Simultaneous discrimination and detection of different OVOCs by cataluminescence ratios. • Eu3+ doped La 2 O 2 CO 3 gas sensor showed enhanced sensitivity. • Energy transfer process on sensing materials was explored. The discrimination and detection of oxygenated volatile organic compounds (OVOCs) is one of the most serious subjects in chemical sensing because OVOCs as a class of substances in volatile organic compounds (VOCs) are far more reactive than alkanes in the atmosphere. Herein, a novel ratio method based on cataluminescence (CTL) intensity on the surface of La 2 O 2 CO 3 (I 460) and La 2 O 2 CO 3 :Eu3+ (I 620) was reported and used for simultaneous discrimination and detection of OVOCs within different concentrations. To confirm the feasibility of the proposed method, six kinds of common OVOCs, including isomers and similar substances were selected as representatives. Results show that the CTL intensity ratios (R 620/460) at 620 nm and 460 nm were distinctive and notable (from 3.55 to 72.7), and the limits of detection (LOD) could be as low as 17.29 ng/mL (propanol). In addition, the principle of discrimination and detection was discussed briefly and the factors for energy transfer were preliminarily discussed to help explore energy transfer process between gas and solid interfaces. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
24. Photocatalysis enhanced cataluminescence gas sensor for carbon monoxide based on perylenetetracarboxylic diimide.
- Author
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Li, Li, Yang, Yongsheng, Deng, Dongyan, Song, Hongjie, and Lv, Yi
- Subjects
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CARBON monoxide detectors , *PHOTOCATALYSIS , *POLLUTION , *MANUFACTURING processes , *DETECTION limit - Abstract
• A novel photocatalysis enhanced cataluminescence (CTL) gas sensor with metal-free catalyst for CO was developed. • PDINH 50 -50, a metal-free catalyst was used as the sensing material in CTL for the first time. • Photocatalysis assisted gas sensor showed the enhanced sensitivity of CO. The rapid and sensitive detection techniques for CO are highly essential for public health and environmental pollution. Herein, a photocatalysis enhanced cataluminescence (CTL) gas sensor with metal-free catalyst for CO was developed. Due to the low CTL reaction activity of CO, photocatalysis which could activate CO was chosen as effective signal amplification technology to improve response sensitivity of CO. Meanwhile, self-assembled 3,4,9,10-Perylenetetracarboxylic Diimide (PDINH), which has stacked ordered structure with π-π stacking, was first used as metal-free catalyst for CO oxidation in CTL process. The π-π stacking and layered structure in PDINH are beneficial for the adsorption of O 2 and CO. Therefore, amplified CTL signal was acquired because of the important role of photocatalysis and the sensing material in CTL process. Under the optimal experimental conditions, a detection limit (3σ) of 0.002 μg mL−1 CO is found in the proposed method, which has been further improved comparing to that of without photocatalysis. The realization of combining photocatalysis with CTL for the first time gives us a perspective on building a new pretreatment strategy for CTL detection. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
25. Highly efficient cataluminescence gas sensor for acetone vapor based on UIO-66 metal-organic frameworks as preconcentrator.
- Author
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Huang, Xiaoying, Huang, Zili, Zhang, Lichun, Liu, Rui, and Lv, Yi
- Subjects
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ACETONE , *METAL-organic frameworks , *GASES , *DETECTORS , *DETECTION limit , *CHEMICAL preconcentration - Abstract
• A highly efficient CTL sensor for acetone vapor coupled with UIO-66 as the preconcentrator was established. • A simple and low-cost home-made adsorption apparatus with UIO-66 was fabricated. • The proposed CTL sensing platform demonstrated advantages of high sensitivity, selectivity, and speediness. Metal-organic frameworks (MOFs) showed a significant sorption potential in the gas capture and preconcentration during recent years because of its super porosity. Herein, we fabricated a simple and inexpensive home-made adsorption apparatus based on UIO-66 as the preconcentrator, which was firstly coupled with a rapid cataluminescence (CTL) sensor to determine acetone vapor. The CTL emission was enhanced by 25 times after the preconcentration of UIO-66, indicating the UIO-66 preconcentrator could efficiently ameliorate sensitivity. As for the adsorption mechanism of UIO-66 for acetone molecules, we deduced that acetone molecules were preferentially located on the Zr clusters with high hydrophilicity. The proposed CTL sensor in combine with UIO-66 adsorption granted a detection limit of acetone down to 2.79 ppm, and demonstrated good selectivity, simplicity, rapidity, and recyclability. This study provides appealing perspectives of UIO-66 as the preconcentrator for the improvement of analytical performance, and the prospect of a miniaturized portable acetone sensor. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
Catalog
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