title: Platelike WO3 sensitized with CdS quantum dots heterostructures for photoelectrochemical dynamic sensing of H2O2 based on enzymatic etching.
abstract: A platelike tungsten trioxide (WO3) sensitized with CdS quantum dots (QDs) heterojunction is developed for solar-driven, real-time, and selective photoelectrochemical (PEC) sensing of H2O2 in the living cells. The structure is synthesized by hydrothermally growing platelike WO3 on fluorine doped tin oxide (FTO) and subsequently sensitized with CdS QDs. The as-prepared WO3-CdS QDs heterojunction achieve significant photocurrent enhancement, which is remarkably beneficial for light absorption and charge carrier separation. Based on the enzymatic etching of CdS QDs enables the activation of quenching the charge transfer efficiency, thus leading to sensitive PEC recording of H2O2 level in buffer and cellular environments. The results indicated that the proposed method will pave the way for the development of excellent PEC sensing platform with the quantum dot sensitization. This study could also provide a new train of thought on designing of self-operating photoanode in PEC sensing, promoting the application of semiconductor nanomaterials in photoelectrochemistry.
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Yanhu
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Chaomin
authors.initials: C
authors.lastname: Gao
authors.affiliation: Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, PR China.
authors.forename: Shenguang
authors.initials: S
authors.lastname: Ge
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Yu
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China. Electronic address: chm_yanm@126.com.
authors.forename: Mei
authors.initials: M
authors.lastname: Yan
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D019187:Cadmium Compounds / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000295:instrumentation* / Q000379:methods; D006735:Horseradish Peroxidase / Q000737:chemistry; D006801:Humans; D006861:Hydrogen Peroxide / Q000032:analysis*; D057230:Limit of Detection; D061986:MCF-7 Cells; D010087:Oxides / Q000737:chemistry*; D045663:Quantum Dots / Q000737:chemistry* / Q000648:ultrastructure; D013440:Sulfides / Q000737:chemistry*; D014159:Transducers; D014414:Tungsten / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D010087:Oxides; D013440:Sulfides; C034939:cadmium sulfide; C511604:tungsten oxide; D006861:Hydrogen Peroxide; D006735:Horseradish Peroxidase; D014414:Tungsten
keywords: CdS quantum dots; Photoelectrochemical; Platelike tungsten trioxide; Quantum dot sensitization