22 results on '"Yang, Ziyin"'
Search Results
2. Ru Nanoclusters on MnO2 Nanotubes for Boosting Electrochemical Nonenzymatic H2O2 Sensing.
- Author
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Yang, Ziyin, Tian, Zhigao, and Qi, Chengcheng
- Abstract
The development of a high-performance electrocatalyst is the key to the construction of highly sensitive electrochemical sensing methods. In this work, we design Ru nanoclusters supported on MnO
2 nanotubes (c-Ru/MnO2 ) as an electrocatalyst for boosting electrochemical nonenzymatic hydrogen peroxide (H2 O2 ) sensing. c-Ru/MnO2 is synthesized based on a facile hydrothermal method, followed by cation exchange and calcination. The obtained c-Ru/MnO2 nanocomposite is characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical methods. Electrochemical studies and theoretical calculations reveal that the anchoring of Ru nanoclusters not only makes MnO2 nanotubes exhibit higher electrochemical surface area and faster electron transfer rate but also promotes the strong adsorption of H2 O2 and optimizes the interactions with the key intermediates OOH*/OO*. Thanks to the synergistic effect between Ru nanoclusters and MnO2 nanotubes, the sensor based on c-Ru/MnO2 exhibits a low anode peak potential of 0.42 V and an extremely high sensitivity of 2967.9 μA mM–1 cm–2 toward H2 O2 . Therefore, c-Ru/MnO2 is demonstrated to be an advanced electrocatalyst for sensitive electrochemical sensing of H2 O2 . [ABSTRACT FROM AUTHOR]- Published
- 2023
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- View/download PDF
3. One-pot synthesis of Fe3O4/polypyrrole/graphene oxide nanocomposites for electrochemical sensing of hydrazine
- Author
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Yang, Ziyin, Sheng, Qinglin, Zhang, Sai, Zheng, Xiaohui, and Zheng, Jianbin
- Published
- 2017
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4. Sensing hydrogen peroxide with a glassy carbon electrode modified with silver nanoparticles, AlOOH and reduced graphene oxide
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Yang, Ziyin, Qi, Chengcheng, Zheng, Xiaohui, and Zheng, Jianbin
- Published
- 2016
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5. Tuning Electrochemical Properties of Silver Nanomaterials by Doping with Boron: Application for Highly Non‐enzymatic Sensing of Hydrogen Peroxide.
- Author
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Yin, Hang, Zhang, Chongchao, Bai, Xiao, Yang, Ziyin, and Liu, Zhe
- Subjects
HYDROGEN peroxide ,ELECTROCHEMICAL sensors ,NANOSTRUCTURED materials ,X-ray powder diffraction ,TRANSMISSION electron microscopy ,SURFACE plasmon resonance ,SILVER nanoparticles - Abstract
A new type of enzyme‐free electrochemical sensor with B−Ag nanomaterials as electrocatalyst was designed. The obtained nanomaterials were characterized by transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and powder X‐ray diffraction (XRD). The results show that B was successfully doped onto the surface of Ag, which reduces the particle size of Ag nanoparticles and expands the crystal plane spacing of Ag, therefore making Ag display larger specific surface area and faster electron transfer rate. The new enzyme‐free electrochemical sensor based on B−Ag shows high electrocatalytic activity for the H2O2 reduction and exhibits excellent sensing performance for the electrochemical detection of H2O2 with a wide range from 0.01 mM to 5.55 mM, a high sensitivity of 68.3 μA⋅mM−1cm−2 and a low detection limit of 0.04 μM. This study demonstrated B−Ag is a promising sensing material for electrochemical enzyme‐free sensors. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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- View/download PDF
6. Quench-induced the formation of enriched oxygen vacancies on the surface of Co3O4 for boosting electrochemical sensing of glucose.
- Author
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Yang, Ziyin, Kong, Yaqi, and Qi, Chengcheng
- Subjects
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OXYGEN detectors , *SURFACE defects , *ENERGY drinks , *STRUCTURE-activity relationships , *GLUCOSE - Abstract
This study regulates the electrocatalytic activity of Co 3 O 4 nanomaterials based on quench-induced oxygen vacancies for boosting electrochemical sensing of glucose. Two different types of Co 3 O 4 nanomaterials were synthesized by the hydrothermal method and high-temperature calcination. It was found that quenching induced abundant oxygen vacancy defects on the surface of Co 3 O 4 nanomaterial. The presence of oxygen vacancy defects not only improves the conductivity of Co 3 O 4 nanomaterials, but also enhances the adsorption of OH- and facilitates the creation of abundant active sites. The enriched oxygen vacancies boost the electrocatalytic activity of Co 3 O 4 nanomaterials, enabling the sensor to detect glucose with an extremely high sensitivity of 1528.1 µA·mM−1·cm−2. Furthermore, the sensor can be utilized for detecting glucose in energy drinks. This study explores the structure-activity relationship between oxygen vacancies and electrocatalytic activity, providing insights for the development of high-performance sensing materials through the oxygen vacancy regulation strategy. [Display omitted] • Quenching induced a large number of oxygen vacancy defects on the surface of Co 3 O 4 nanomaterial. • Oxygen vacancies improve the conductivity of Co 3 O 4 , enhance adsorption of OH- and facilitate the creation of active site. • Oxygen vacancies activate electrocatalytic activity of Co 3 O 4 and boost electrochemical sensing of glucose. • This study provides ideas for constructing high-performance sensing materials based on oxygen vacancies regulation strategy. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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7. A novel strategy for realizing highly sensitive nonenzymatic detection of H2O2 based on regulating crystallinity of CoO nanosheets.
- Author
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Yang, Ziyin, Tian, Zhigao, Zhang, Xinjin, and Qi, Chengcheng
- Subjects
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CRYSTALLINITY , *NANOSTRUCTURED materials , *ELECTROCHEMICAL sensors , *ELECTRON transport , *DETECTION limit , *ELECTROCATALYSTS - Abstract
This study reports a novel strategy to construct a highly sensitive H 2 O 2 electrochemical sensor by regulating the crystallinity of CoO nanosheets. [Display omitted] • This study reports a novel strategy to construct a highly sensitive electrochemical sensing method by regulating the crystallinity of CoO nanosheets. • It is interesting to find that the crystallinity has a significant effect on the electrochemical surface area and electron transport rate. • The sensor based on CoO nanosheets with low crystallinity exhibits excellent performance for H 2 O 2 analysis. • This study provides a novel strategy to design efficient electrocatalyst for applications. This study reports a novel strategy to construct a highly sensitive electrochemical sensing method based on crystallinity regulation. Two kinds of CoO nanosheets with different crystallinity were prepared by adjusting annealing temperature. The results show that decreasing crystallinity of CoO nanosheets not only increases electrochemical surface area but also accelerates electron transport rate. This is beneficial to improve the electrocatalytic activity of CoO nanosheets for electrochemical oxidation of H 2 O 2 , and therefore makes the sensor detect H 2 O 2 in a linear range of 0.2 µM to 11 mM, a sensitivity of 909.9 µA·mM−1·cm−2 and a low detection limit of 0.2 µM. This study provides a new perspective to regulate the electrocatalytic activity of nanomaterials for constructing highly sensitive electrochemical sensor. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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- View/download PDF
8. Controllable synthesis of copper sulfide for nonenzymatic hydrazine sensing.
- Author
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Yang, Ziyin, Zhang, Sai, Zheng, Xiaohui, Fu, Yanyi, and Zheng, Jianbin
- Subjects
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COPPER sulfide , *CHEMICAL synthesis , *HYDRAZINE , *ELECTROCHEMICAL analysis , *NANOPARTICLES - Abstract
Constructing a novel enzyme-free electrode for sensitive and selective detection of hydrazine (N 2 H 4 ) in neutral medium is important. In this paper, Copper sulfide (CuS) with different morphologies were synthesized for electrochemical sensing of N 2 H 4 . A facile hydrothermal approach is developed for the shape-controlled synthesis of CuS architectures. The effects of reaction temperature, time, solvent and anion type on the morphologies of CuS were studied and it was found that CuS with flower-like, nanoparticle-like, rod-like and multilayered-like morphologies could be selectively prepared by just changing the type of metal precursor. The electrochemical performances of various CuS structures were investigated, which showed that flower-like CuS exhibited higher electrocatalytic activity toward N 2 H 4 oxidation and could offer superior analytical performances with a wide linear range of 0.5 μM to 4.775 mM, a high sensitivity of 359.3 μA mM −1 cm −2 and a low detection limit of 0.097 μM (S/N = 3). Moreover, the application of the sensor for detecting N 2 H 4 in tap water samples was demonstrated and the good recovery obtained made it a great potential for practical use. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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9. MnCo2S4 nanoparticle-assembled hierarchical porous sphere as an effective electrocatalyst for highly sensitive and selective nonenzymatic detection of hydrazine.
- Author
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Yang, Ziyin, Zheng, Xiaohui, and Zheng, Jianbin
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ELECTROCATALYSTS , *HYDRAZINE , *HYDROTHERMAL deposits , *OXIDATION , *ELECTROCHEMICAL analysis - Abstract
It is highly attractive to design and construct a novel enzyme-free electrode for sensitive and selective detection of hydrazine (N 2 H 4 ). In this paper, for the first time, porous MnCo 2 S 4 sphere was used as an excellent electrocatalyst for N 2 H 4 oxidation, which was synthesized through a facile hydrothermal method. The experiment results revealed that porous MnCo 2 S 4 sphere was constructed from interconnected nanoparticle with a three-dimensional porous structure. Electrochemical measurements demonstrate that the presence of MnCo 2 S 4 reduced the overpotential and accelerated kinetics of N 2 H 4 oxidation. The sensor based on porous MnCo 2 S 4 sphere exhibited an excellent performance for N 2 H 4 analysis with a wide linear range of 0.5 μM–4.78 mM, a high sensitivity of 1495.7 μA mM −1 cm −2 , a low detection limit of 0.33 μM (S/N = 3). Moreover, the application of the sensor for detection of N 2 H 4 in tap water samples was demonstrated, which indicates that MnCo 2 S 4 can be employed as the efficient material for electrochemical sensing of N 2 H 4 . [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
10. Shape-controlled synthesis of CuCo2S4 as highly-efficient electrocatalyst for nonenzymatic detection of H2O2.
- Author
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Yang, Ziyin, Zhang, Sai, Fu, Yanyi, Zheng, Xiaohui, and Zheng, Jianbin
- Subjects
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COPPER compounds synthesis , *ELECTROCATALYSTS , *ELECTROCHEMICAL sensors , *HYDROGEN peroxide , *OXIDATION , *HYDROTHERMAL synthesis - Abstract
Controllable synthesis of CuCo 2 S 4 was reported for electrochemical sensing of H 2 O 2 . It is the first time that CuCo 2 S 4 was explored as electrocatalyst for H 2 O 2 oxidation. A facile hydrothermal approach is developed for the shape-controlled synthesis of CuCo 2 S 4 by just changing the type of metal precursor. The structures, compositions and electrochemical properties of CuCo 2 S 4 were studied. Electrochemical studies showed that flower-like CuCo 2 S 4 with large surface area and three-dimensional porous structure exhibited excellent electrocatalytic activity toward H 2 O 2 oxidation and an excellent analytical performances with a high sensitivity of 857.1 μA mM −1 cm −2 , a low detection limit of 0.084 μM (S/N = 3) and a wide linear range of 4 orders of magnitude were achieved. These results demonstrated that CuCo 2 S 4 was a promising efficient sensing material for electrochemical sensing of H 2 O 2 . [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
11. Facile synthesis of three-dimensional porous Au@Pt core-shell nanoflowers supported on graphene oxide for highly sensitive and selective detection of hydrazine.
- Author
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Yang, Ziyin, Zheng, Xiaohui, and Zheng, Jianbin
- Subjects
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HYDRAZINE , *POROUS materials synthesis , *SILVER , *PLATINUM , *ELECTROCHEMICAL sensors , *CHITOSAN , *VITAMIN C - Abstract
A novel strategy is developed to synthesize three-dimensional porous Au@Pt core-shell nanoflowers supported on GO (Au@Pt-nFs/GO) for enhanced electrochemical sensing of hydrazine (N 2 H 4 ). Au@Pt-nFs/GO nanocomposite was synthesized through a facile and green method, where ascorbic acid and chitosan were employed as the reductant and linking agent, respectively. The experiment results revealed that a large numbers of Au@Pt-nFs with Au cores and Pt dendritic shells were distributed on the surface of GO sheets. Meanwhile, Au@Pt-nFs/GO with large surface area, abundant active sites and open structure reduced the overpotential and accelerated kinetics of N 2 H 4 oxidation, therefore making the sensor based on Au@Pt-nFs/GO exhibit an excellent performance for N 2 H 4 analysis with a wide linear range of 0.8 μM–0.429 mM, a high sensitivity of 1695.3 μA mM −1 cm −2 and a low detection limit of 0.43 μM (S/N = 3). Moreover, the sensor also exhibited good selectivity, repeatability and stability. Application of the sensor for the detection of N 2 H 4 in tap water samples was demonstrated. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
12. A facile one-step synthesis of Fe2O3/nitrogen-doped reduced graphene oxide nanocomposite for enhanced electrochemical determination of dopamine.
- Author
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Yang, Ziyin, Zheng, Xiaohui, and Zheng, Jianbin
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IRON oxide synthesis , *NITROGEN compounds , *DOPING agents (Chemistry) , *GRAPHENE oxide , *NANOCOMPOSITE materials , *ELECTROCHEMISTRY , *DOPAMINE - Abstract
Fe 2 O 3 /nitrogen-doped reduced graphene oxide (Fe 2 O 3 /N-rGO) was synthesized for enhanced electrochemical determination of dopamine (DA). The nanocomposite was synthesized through a facile one-step hydrothermal method, where ethylenediamine served as reducing agent, nitrogen source and coordinating agent, therefore making the reduction and nitrogen doping of GO and the formation of Fe 2 O 3 occur simultaneously. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction spectroscopy (XRD), fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and electrochemical techniques were employed to characterize Fe 2 O 3 /N-rGO. The results showed that large numbers of Fe 2 O 3 with spindle morphology were distributed on the surface of N-rGO and the synergetic effect between Fe 2 O 3 and N-rGO made the sensor based on Fe 2 O 3 /N-rGO exhibit an excellent performance toward DA detection with a wide linear range of 0.5 μM to 0.34 mM, a high sensitivity of 418.6 μA mM −1 cm −2 and a low detection limit of 0.49 μM (S/N = 3). Moreover, the sensor also exhibited good selectivity, reproducibility and stability. Therefore, Fe 2 O 3 /N-rGO can be applied as a promising type of sensing material for electrochemical detection of DA. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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13. A facile one-step synthesis of prussian blue/polyaniline/graphene oxide nanocomposites for electrochemical sensing of hydrogen peroxide.
- Author
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Yang, Ziyin, Zheng, Xiaohui, and Zheng, Jianbin
- Subjects
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PRUSSIAN blue , *POLYANILINES , *GRAPHENE oxide , *ELECTROCHEMICAL sensors , *HYDROGEN peroxide , *NANOCOMPOSITE materials - Abstract
Prussian blue/polyaniline/graphene oxide (PB/PANI/GO) nanocomposites were synthesized and used for electrochemical sensing of hydrogen peroxide (H 2 O 2 ). PB/PANI/GO nanocomposites were synthesized through a facile one-step approach, where aniline acted as both the precursor of PANI and the reductant for FeCl 3 –K 3 [Fe(CN) 6 ], therefore making polymerization of aniline and anchoring of PB nanoparticles on PANI/GO occur simultaneously. Then, the nanocomposites were characterized by transmission electron microscopy (TEM), X-ray diffraction spectroscopy (XRD), fourier transform infrared spectroscopy (FTIR) and electrochemical techniques. The results indicated that PB nanoparticles with the size of about 4.0 nm were homogeneously distributed on the surface of PANI/GO, which made the sensor based on PB/PANI/GO exhibit an excellent performance toward H 2 O 2 detection with a wide linear range of 5.0 μM to 1.275 mM, a sensitivity of 60.16 μA mM −1 cm −2 and a low detection limit of 1.9 μM (S/N = 3). [ABSTRACT FROM AUTHOR]
- Published
- 2016
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14. Synthesis of Ag/γ-AlOOH nanocomposites and their application for electrochemical sensing.
- Author
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Yang, Ziyin, Qi, Chengcheng, Zheng, Xiaohui, and Zheng, Jianbin
- Subjects
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NANOSTRUCTURED materials synthesis , *SILVER nanoparticles , *HYDROGEN peroxide , *BOEHMITE , *SILVER catalysts , *SCANNING electron microscopes , *ELECTROCHEMICAL analysis - Abstract
Ag/γ-AlOOH nanocomposites were synthesized by employing γ-AlOOH as the support for Ag catalyst and then the nanocomposites were used for fabricating nonenzymatic H 2 O 2 sensor. Transmission electron microscopy and scanning electron microscope observations reveal that large numbers of silver nanoparticles were well distributed on the surface of γ-AlOOH and the electrochemical investigations indicate that the nanocomposites possess an excellent performance toward H 2 O 2. The linear range is estimated to be from 5.0 μM to 9.0 mM with a low detection limit of 1.1 μM (S/N = 3), a sensitivity of 64.4 μA mM − 1 cm − 2 and a response time of 3 s. These results indicated that Ag/γ-AlOOH nanocomposites were the promising electrocatalytic material for constructing sensors. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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15. Synthesis of silver nanoparticle at a gas/liquid interface in the presence of silver seeds and its application for electrochemical sensing.
- Author
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Yang, Ziyin, Qi, Chengcheng, Zheng, Xiaohui, and Zheng, Jianbin
- Subjects
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NANOSTRUCTURED materials synthesis , *SILVER nanoparticles , *GAS-liquid interfaces , *ELECTROCHEMICAL sensors , *TRANSMISSION electron microscopy , *HYDROGEN peroxide - Abstract
Silver nanoparticles were synthesized by reducing [Ag(NH 3 ) 2 ] + at a gas/liquid interface in the presence of silver seeds. Transmission electron microscopy (TEM) observations reveal that the size of these silver nanoparticles is around 35–40 nm with the average particle size of 37 nm. The silver nanoparticles were applied for the electrochemical sensor and electrochemical investigations indicate that the nanoparticles possess an excellent performance toward H 2 O 2 . The linear range is estimated to be from 5.0 μM to 4.0 mM with a low detection limit of 1.7 μM, a sensitivity of 166.7 μA mM −1 cm −2 and a response time of 3 s. Additionally, the sensor exhibits good anti-interference. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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16. Synthesis of a three-dimensional porous Co3O4 network interconnected by MWCNTs and decorated with Au nanoparticles for enhanced nonenzymatic glucose sensing.
- Author
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Yang, Ziyin and You, Jinmao
- Subjects
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GOLD nanoparticles , *GLUCOSE analysis , *GLUCOSE , *CHARGE exchange , *CARBON monoxide detectors , *PLATINUM nanoparticles , *DETECTION limit , *SURFACE plasmon resonance - Abstract
A three-dimensional interconnected electrically conducting network composed with porous Co 3 O 4 , MWCNTs and Au nanoparticles was synthesized as electrocatalyst for enhanced nonenzymatic glucose sensing. Possessing porous structure and fast electron transfer rate is vital for regulating electrocatalytic performance of nanomaterials. Considering the low conductivity and poor electrocatalytic activity of Co 3 O 4 , we report a hybrid composite of porous Co 3 O 4 interconnected by MWCNTs and decorated with Au nanoparticles (Co 3 O 4 /MWCNTs/Au) for nonenzymatic glucose sensing due to the importance of glucose in many fields. The nanocomposite is synthesized by inserting MWCNTs into ZIF-67 precursor, decorating Au3+ on ZIF-67/MWCNTs, and then calcinating at high temperature. TEM results reveal that MWCNTs were inserted into porous Co 3 O 4 and Au nanoparticles were successfully decorated on surface of Co 3 O 4 /MWCNTs, which made the nanocomposite look like a three-dimensional interconnected electrically conducting network. Electrochemical results display that the presence of MWCNTs and Au nanoparticles significantly facilitated electron transfer rate and improved electrocatalytic activity of Co 3 O 4 , therefore enabling the sensor based on Co 3 O 4 /MWCNTs/Au to detect glucose in a wide linear range of 0.2 μM - 1.1 mM with a high sensitivity of 1138.4 μA mM−1 cm-2 and a low detection limit of 0.1 μM (S/N = 3). This study provides a strategy to tailor electrocatalytic performance of nanomaterail and also provides a promising sensing material for glucose detection. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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- View/download PDF
17. Synthesis of Au core flower surrounding with sulphur-doped thin Co3O4 shell for enhanced nonenzymatic detection of glucose.
- Author
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Yang, Ziyin and Bai, Xiao
- Subjects
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GLUCOSE analysis , *GLUCOSE , *SULFUR , *TRANSMISSION electron microscopy , *X-ray microscopy , *OXIDATION-reduction reaction - Abstract
• Au core flower surrounding with sulphur-doped thin Co 3 O 4 shell was synthesized for electrochemical sensing of glucose. • Electrocatalytic activity of Co 3 O 4 was improved due to modification of Au and S doping. • The sensor based on Au@Co 3 O 4 -S exhibits excellent performance for glucose analysis. • This study provides a strategy for tailoring the catalytic performance of Co 3 O 4. This paper reports the synthesis of S-doped thin Co 3 O 4 shell with Au flower as core for nonenzymatic glucose sensing, where Au@Co 3 O 4 was obtained through assembly process triggered by redox reaction of Co2+ and Au3+, and then S was doped into Co 3 O 4 shell via a hydrothermal process. The morphology, composition and structure of Au@Co 3 O 4 -S were characterized by transmission electron microscopy and X-ray diffraction, which showed that the core–shell structure was composed with Au core flower and S-doped thin Co 3 O 4 shell. Electrochemical property of Au@Co 3 O 4 -S toward glucose was explored, and an excellent electrocatalytic performance with a wide linear range of 0.2 μM–3.1 mM, a high sensitivity of 1127.3 μA mM−1 cm−2 and a low detection limit of 0.09 μM (S/N = 3) was obtained, which may be due to that the low conductivity of Co 3 O 4 was mitigated by conductive Au core flower and S doping, therefore making thin Co 3 O 4 shell provide more effective active sites for glucose reaction. Considering such excellent results, Au@Co 3 O 4 -S was proven as a promising material for electrochemical sensing of glucose. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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18. A facile one-pot synthesis of Au core flower surrounding with thin Co3O4 shell for highly sensitive detection of hydrogen peroxide.
- Author
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Yang, Ziyin and Bai, Xiao
- Subjects
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CHARGE exchange , *FLOWERS , *DETECTION limit , *NANOCOMPOSITE materials , *LINEAR statistical models - Abstract
Au core flower surrounding with thin Co 3 O 4 shell for highly sensitive detection of hydrogen peroxide. In this study, we described the facile synthesis of Au core flower surrounding with thin Co 3 O 4 shell for enhanced electrochemical sensing of H 2 O 2. Such core-shell structure was obtained by employing Au3+ to oxidize Co2+ under alkaline conditions for triggering the redox assembly process. The experiment results revealed that conductive Au core flower was surrounded by thin Co 3 O 4 shell, and such structure not only accelerates electron transfer rate but also provides more effective active sites for H 2 O 2 reaction, therefore making the sensor based on Au@Co 3 O 4 exhibit an excellent performance for H 2 O 2 analysis with a linear range of 0.2 μM-7.1 mM, a high sensitivity of 722.4 μA mM−1 cm-2 and a low detection limit of 0.06 μM. The excellent experimental results implied that Au@Co 3 O 4 nanocomposite was a promising sensing material for electrochemical detection of H 2 O 2. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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19. Engineering Co3O4 with Co defects for highly sensitive nonenzymatic detection of glucose.
- Author
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Qi, Chengcheng, Zhang, Chongchao, and Yang, Ziyin
- Subjects
- *
TRANSITION metal oxides , *METAL defects , *X-ray photoelectron spectroscopy , *ENGINEERING , *OXIDATION of glucose , *GLUCOSE , *GLUCOSE oxidase - Abstract
Defect engineering was considered as an effective strategy to regulate electrocatalytic activities of transition metal oxides. However, there are seldom reports about metal defects in electrochemical sensing. In this work, Co-defected Co 3 O 4 was synthesized via thermal treatment of glycerolatocobalt (CoGly) precursor for constructing a novel electrochemical nonenzymatic glucose sensor. The obtained nanomaterials were characterized by transmission electron microscopy (TEM), powder X-ray diffractometry (XRD), Raman spectra, X-ray photoelectron spectroscopy (XPS) and electrochemical techniques. The presence of Co defects regulated electronic structure of Co 3 O 4 , which not only speeds up electron transfer rate but also exposes more high-valent Co sites, thus improving electrocatalytic activities. Under optimized conditions, Co-defected Co 3 O 4 electrode exhibited excellent performance for glucose analysis with a wide linear range of 0.2 µM to 0.5 mM, a low detection limit of 0.16 µM. Importantly, an ultrahigh sensitivity of 2595.7 µA·mM−1·cm−2 was also obtained, which was about 10 times higher than that of conventional Co 3 O 4. Therefore, engineering Co 3 O 4 with Co defects is an effective strategy to tailor electrocatalytic activity, which sheds light on the potential applications of metal defects in the field of electrochemical nonenzymatic sensing. [Display omitted] • There are seldom reports about metal defects in electrochemical sensing. • A novel electrochemical sensor based on Co-defected Co 3 O 4 was fabricated. • Co-defected Co 3 O 4 is employed as electrocatalyst for glucose oxidation. • The introduction of Co defects makes Co 3 O 4 exhibit remarkable catalytic performance for glucose detection. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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20. Constructing heterointerface of crystalline Au nanoparticles and amorphous porous CoSnO3 nanocubes for sensitive electrochemical detection of glucose.
- Author
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Qi, Chengcheng, Zhang, Chongchao, and Yang, Ziyin
- Subjects
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GOLD nanoparticles , *SURFACE plasmon resonance , *GLUCOSE , *CRYSTALLINE interfaces , *GLUCOSE analysis , *OXIDATION of glucose , *TRANSMISSION electron microscopy - Abstract
We constructed a unique heterointerface of crystalline Au nanoparticles and amorphous porous CoSnO 3 nanocubes for sensitive electrochemical detection of glucose. [Display omitted] • Au/CoSnO 3 was explored as a novel electrocatalyst for highly sensitive nonenzymatic detection of glucose. • It is the first time that CoSnO 3 is employed as electrocatalyst for glucose oxidation. • The formation of a unique amorphous/crystalline heterogeneous interface makes Au/CoSnO 3 exhibit remarkable catalytic performance for glucose detection. Au/CoSnO 3 was explored as a novel electrocatalyst for highly sensitive nonenzymatic detection of glucose. Au/CoSnO 3 was synthesized by a galvanic replacement strategy. The obtained nanomaterials were characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDS), X-ray diffractometry (XRD) and electrochemical techniques. The results display that a small amount of crystalline Au nanoparticles are decorated on the surface of amorphous porous CoSnO 3 nanocubes. The formation of such unique amorphous/crystalline heterogeneous interface makes Au/CoSnO 3 exhibit excellent electrocatalytic activity for the electrochemical oxidation of glucose. The sensor based on Au/CoSnO 3 can detect glucose with a wide linear detection range of 0.2 µM–0.11 mM, a high sensitivity of 2317.1 µA·mM−1·cm−2 and a low detection limit of 0.078 µM. This study demonstrates CoSnO 3 as an effective sensing material and also provides a way to improve electrocatalytic properties of nanomaterials through interfacial engineering. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
21. Fe doping induced formation of crystalline/amorphous NiCo2O4 core/shell heterostructure for highly sensitive nonenzymatic detection of glucose.
- Author
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Qi, Chengcheng, Zhang, Chongchao, and Yang, Ziyin
- Subjects
- *
ELECTROCATALYSTS , *CATALYSTS , *GLUCOSE , *X-ray photoelectron spectroscopy , *CHARGE exchange , *TRANSMISSION electron microscopy , *CYCLIC voltammetry - Abstract
A novel strategy was reported to improve electrocatalytic activity of NiCo 2 O 4 by doping Fe. It is interesting to find that the doping of Fe induces formation of nanorod composing with crystalline core and thin amorphous shell. The composition, structure and properties of NiCo 2 O 4 are well characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry and amperometric method. The results display that the presence of thin amorphous shell is conducive to accelerating electron transfer rate and exposing more effective active sites, therefore making the sensor based on Fe-doped NiCo 2 O 4 detect glucose in a wide linear range from 0.2 μM to 3.1 mM with a high sensitivity of 3055.7 μA mM−1 cm−2 and a low detection limit of 0.19 μM. This unique crystalline core/amorphous shell-structured NiCo 2 O 4 demonstrates promising potential as an effective electrocatalyst for glucose sensing. • A unique NiCo 2 O 4 crystalline core/amorphous shell heterostructure is developed. • The doping of Fe induces the formation of crystalline core surrounding with thin amorphous shell. • The presence of thin amorphous shell is beneficial to improve electron transfer and increase active sites. • The sensor based on Fe-doped NiCo 2 O 4 exhibited remarkable catalytic performance for glucose detection. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
22. Ru doping induced lattice distortion of Cu nanoparticles for boosting electrochemical nonenzymatic hydrogen peroxide sensing.
- Author
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Zhang, Chongchao, Yin, Hang, Bai, Xiao, and Yang, Ziyin
- Subjects
- *
HYDROGEN peroxide , *SURFACE plasmon resonance , *NANOPARTICLES , *HYDROGEN detectors , *ELECTROCHEMICAL sensors , *TRANSMISSION electron microscopy - Abstract
In this paper, we report a new strategy to activate the electrocatalytic activity of Cu to realize the non-enzymatic detection of hydrogen peroxide. The Ru-doped copper nanoparticles were prepared on the surface of carbon materials by direct pyrolysis of Ru in exchange for Cu-BTC metal-organic framework. The materials were characterized by transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and x-ray diffraction (XRD). Surprisingly, Ru doping induced obvious lattice distortion of Cu nanoparticles, which made Cu nanoparticles exhibit excellent electrocatalytic activity for hydrogen peroxide reduction. The sensor based on Ru-doped Cu nanoparticles can detect hydrogen peroxide in a wide linear range from 0.01 mM to 5.55 mM. Moreover, as a hydrogen peroxide sensor, it has a high sensitivity of 327.14 µA·mM−1·cm−2 and a low detection limit of 8.9 µM. Therefore, Cu nanoparticles with the lattice distortion was demonstrated to be a potential material for hydrogen peroxide electrochemical sensor. [Display omitted] • A highly sensitive electrochemical H 2 O 2 sensor based on Ru-Cu/C is proposed. • Ru-Cu/C was synthesized by direct pyrolysis of Ru-exchanged Cu-BTC metal-organic framework. • Ru doping induce lattice distortion of Cu nanoparticles, increases active area and speeds up electron transfer rate. • It provides a novel strategy to activate electrocatalytic activity of metallic nanomaterials via lattice distortion. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
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