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281 results on '"Han, De-Man"'

18. Molecule Engineering Metal–Organic Framework-Based Organic Photoelectrochemical Transistor Sensor for Ultrasensitive Bilirubin Detection

Author

Cai, Huihui, Zhang, Xiao-Cui, Zhang, Lin, Luo, Chen, Lin, Hui-Jin, Han, De-Man, Chen, Feng-Zao, and Huang, Chaobiao

Abstract

The functionalization of metal–organic frameworks (MOFs) with organic small molecules by in situ postsynthetic modification has garnered considerable attention. However, the precise engineering of recognition sites using this method remains rarely explored in optically controlled bioelectronics. Herein, employing the Schiff base reaction to embed the small molecule (THBA) into a Zr-MOF, we fabricated a hydroxyl-rich MOF on the surface of titanium dioxide nanorod arrays (U6H@TiO2NRs) to develop light-sensitive gate electrodes with tailored recognition capabilities. The U6H@TiO2NR gate electrodes were integrated into organic photoelectrochemical transistor (OPECT) sensing systems to tailor a sensitive device for bilirubin (I-Bil) detection. In the presence of I-Bil, coordination effects, hydrogen bonding, and π–π interactions facilitated strong binding between U6H@TiO2NRs and the target I-Bil. The electron-donating property of I-Bil influenced the gate voltage, enabling precise control of the channel status and modulation of the channel current. The OPECT device exhibited exceptional analytical performance toward I-Bil with wide linearity ranging from 1 × 10–16to 1 × 10–9M and a low limit detection of 0.022 fM. Leveraging the versatility of small molecules for boosting the functionalization of materials, this work demonstrates the great potential of the small molecule family for OPECT bioanalysis and holds promise for the advancement of OPECT sensors.

Published
2024
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32. Oxygen Vacancy-Mediated CuWO4/CuBi2O4Samples with Efficient Charge Transfer for Enhanced Catalytic Activity toward Photodegradation of Pharmacologically Active Compounds

Author

Chen, Wei, Zhang, Wen-Jie, Wang, Kai, Chang, Ling, Yan, Rui-Qiang, Xiong, Xianqiang, Huang, Guo-Bo, and Han, De-Man

Abstract

Photocatalytic degradation is a promising method for controlling the increasing contamination of the water environment due to pharmacologically active compounds (PHACs). Herein, oxygen vacancy (OV)-modulated Z-scheme CuWO4/CuBi2O4hybrid systems were fabricated viathermal treatment by loading of CuWO4nanoparticles with OVs on CuBi2O4surfaces. The synthesized CuWO4/CuBi2O4hybrid samples exhibited an enhanced photodegradation ability to remove PHACs under visible-light irradiation. More importantly, an optimized sample (10 wt % CuWO4/CuBi2O4) exhibited superior catalytic activity and excellent recycling stability for PHAC photodegradation. In addition, possible degradation paths for PHAC removal over the CuWO4/CuBi2O4hybrid systems were proposed. The enhanced photocatalytic performance could be attributed to the efficient separation and transfer of photoformed charge pairs viathe Z-scheme mechanism. This Z-scheme mechanism was systematically analyzed using trapping experiments of active species, ultraviolet photoelectron spectroscopy, electron spin resonance, and the photodepositions of noble metals. The findings of this study can pave the way for developing highly efficient Z-scheme photocatalytic systems for PHAC photodegradation.

Published
2023
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36. Atomistic structural engineering of conjugated organic polymer cathodes for high-performance Li-organic batteries.

Author

Li, Yuke, Ding, Yijiao, Wu, Juncheng, Wang, Yu, Chen, Lei, Jin, Yanxian, Zhang, Li, Ren, Shi-Bin, and Han, De-Man

Abstract

Conjugated organic polymers have been deemed as one type of the most promising electrode materials for lithium-ion batteries (LIBs) due to their structural diversity and functional designability. However, the poor conductivities and limited redox-active sites of these polymers severely impede their applications in LIBs. Herein, four novel pyrene-4,5,9,10-tetraone (PTO)-based polymers (namely PTO-Bz, PTO-Py, PTO-Pm, and PTO-Tz) were designed and synthesized as cathode materials with high electrochemical activity (four redox sites of PTO units) and superb structural/chemical stability. By changing the N content in aryl linkers, the electronic conduction and transportation of polymer structures could be readily adjusted, leading to enhanced electrochemical activity. As a result, the optimal PTO-Py polymer displays high electronic conductivity and enhanced pseudocapacitive behavior compared with the other samples. When evaluated as a cathode for LIBs, the PTO-Py electrode shows a high lithium storage performance of 220.4 mA h g−1 with an ICE of 97.0% at 0.1 A g−1, superior rate performance (153.1 mA h g−1 at 10 A g−1), and excellent cycling abilities (70.8% capacity retention over 2000 cycles at 1.0 A g−1). In addition, ex situ FT-IR and XPS analyses were also carried out to further understand the Li+ storage mechanism. This work unveils an efficacious strategy to exploit high-performance conjugated organic polymer electrodes for energy storage systems. [ABSTRACT FROM AUTHOR]

Published
2023
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46. Bandgap engineering of covalent organic frameworks for boosting photocatalytic hydrogen evolution from water.

Author

Chen, Yuxiang, Luo, Xiao, Zhang, Jiejie, Hu, Lu, Xu, Ting, Li, Wei, Chen, Lei, Shen, Mao, Ren, Shi-Bin, Han, De-Man, Ning, Guo-Hong, and Li, Dan

Abstract

Solar light-promoted hydrogen production from water using covalent organic frameworks (COFs) as a photocatalyst is an attractive technique for clean energy sources. To boost the photocatalytic performance of COFs, it is necessary to narrow their bandgap. However, the bandgap engineering of COFs at the molecular level is less explored. Here, we synthesized four COFs using 2,4,6-tris(4-aminophenyl)-1,3,5-triazine with 1,3,5-triformylbenzene, 2,4,6-triformylphloroglucinol, 2,4,6-triformylphenol, and 2,4,6-triformylresorcinol, respectively, denoted as COF-OH-n (n = 0–3, representing the number of –OH groups). The different degrees of proton tautomerism in COF-OH-n arise from the different numbers of β-ketoenamine linkages in their skeletons, leading to the regulation of the visible light absorbing ability, bandgap, and band edge positions of COF-OH-n. Due to irreversible proton tautomerism in COF-OH-3, it exhibited the most suitable band structures with a bandgap of 2.28 eV and a flat band of −0.62 eV among COF-OH-n , resulting in the highest photocatalytic hydrogen production rate from water (i.e., 9.89 mmol g−1 h−1), while the other COFs delivered significantly low photocatalytic performances (e.g., ∼0, 0.11, and 2.91 mmol g−1 h−1 for COF-OH-1, COF-OH-0 and COF-OH-2, respectively). [ABSTRACT FROM AUTHOR]

Published
2022
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