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Engineering interfacial band hole extraction on chemical-vapor-deposited MoS 2/CdS core-shell heterojunction photoanode:The junction thickness effects on photoelectrochemical performance

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Journal of Materials Science & Technology 2023年第36期167卷 107-118页

作者： Zhiyuan Peng Yilu Su Maziar Jafari mohamed siaj Department of Chemistry and Biochemistry Universitédu QuébecàMontréalMontréalQC H3C 3P8Canada

Heterojunction fabrication is a promising strategy that can greatly boost the charge carrier separation and improve the solar-to-hydrogen conversion efficiency of photoelectrochemical(PEC)***,such technology still suffers from limited contact *** this study,the chemical vapor deposition(CVD)technique was for the first time used to construct the CdS/MoS_(2)heterojunction photoanode with a unique core-shell nanoarchitecture,in which a continuous crystalline MoS_(2)nanosheet layer was grown directly on one-dimensional(1D)oriented CdS nanorods(NRs)in a plane-to-plane stacking *** optimization of junction thickness with adjustable MoS_(2)loading from mono to a few layers was achieved by experimental parameters *** characterizations show that the MoS_(2)shell plays a dual role as an optical absorption booster for more photo-exciton generation and a surface passivator of trap ***,the formed heterojunction helps regulate the unidirectional charge migration for a significantly suppressed electron-hole recombination process,which synergistically contributes to higher quantum yield and *** a result,the optimized CdS/MoS_(2)heterojunction photoanode with 3-layered MoS_(2)wrapping exhibits the highest photocurrent density and photoconversion efficiency,over a two-fold increase,compared to those of pristine CdS and the previously reported CdS/MoS_(2)***,due to the rapid hole extraction from CdS and transferred surface oxidation sites,the present CdS/MoS_(2)heterostructure demonstrates better corrosion resistance and higher *** present work is expected to provide a versatile platform for exploiting the CVD technique to develop other MoS_(2)-based heterojunction photoelectrodes with extensive PEC applications.

关键词： Photoelectrochemical Hydrogen evolution Heterojunction fabrication Photoanode Cadmium sulfide Molybdenum sulfide

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Functionalized CVD monolayer graphene for label-free impedimetric biosensing

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Nano Research 2015年第5期8卷 1698-1709页

作者： Shimaa Eissa Gaston Contreras Jimenez Farzaneh Mahvash Abdeladim Guermoune Chaker Tlili Thomas Szkopek Mohammed Zourob mohamed siaj Institut national de la recherche scientifique Centre - Energie Matefiaux et Telecommunications 1650 BouL Lionel Boulet Varennes (Quebec) J3X 1S2 Canada Departemen t de Chimie et Biochimie Universite du Quebec a Montreal Mon trial Quebec H3C 3P8 Canada Dept. ofElectricaland Computer Engineering McGill University Montreal Quebec H3A 2A7 Canada Cranfield Health Vincent Building Cranfield University Cranfield Bedfordshire UK

Recent advances in large area graphene growth have led to many applications in different areas. In the present study, chemical vapor deposited （CVD） monolayer graphene supported on glass substrate electrochemical biosensing applications was examined as electrode material for We report a facile strategy for covalent functionalization of CVD monolayer graphene by electrochemical reduction of carboxyphenyl diazonium salt prepared in situ in acidic aqueous solution. The carboxyphenyl-modified graphene is characterized using Raman spectroscopy, X-ray photoelectron spectroscopy （XPS）, and atomic force microscopy （AFM）, as well as electrochemical impedance spectroscopy （hIS）. We also show that the number of grafted carboxyphenyl groups on the graphene surface can be controlled by the number of cyclic voltammetry （CV） scans used for electrografting. We further present the fabrication and characterization of an immunosensor based on immobilization of ovalbumin antibody on the graphene surface after the activation of the grafted carboxylic groups via EDC/NHS chemistry. The binding between the surface-immobilized antibodies and ovalbumin was then monitored using Faradaic EIS in [Fe（CN）6]^3-/4- solution. The percentage change of charge transfer resistance （Rct） after binding exhibited a linear dependence for ovalbumin concentrations ranging from 1.0 pg·mL^-1 to 100 ng·mL^-1, with a detection limit of 0.9 pg·mL^-1. Our results indicate good sensitivity of the developed functionalized CVD graphene platform, paving the way for using CVD monolayer graphene in a variety of electrochemical biosensing devices.

关键词： CVD graphene electrochemical impedance spectroscopy Biosensor diazoniumfunctionalization

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