Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 11, Pages 11489-11496Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c02592
Keywords
BiOI; ZnAgInS; photoelectrochemical; bioanalysis; Z-scheme
Funding
- National Key Research and Development Program of China [2017YFA0700404]
- National Natural Science Foundation of China [21535003, 21575022]
- Key Research & Development Plan of Jiangsu Province [BE2018617]
- Fundamental Research Funds for the Central Universities [2242016K41055]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_0073]
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A ZnAgInS quantum dot (QD)-decorated BiOI microsphere (BiOI-ZAIS) heterostructure was first proposed and successfully employed for sensitive cathodic photoelectrochemical (PEC) bioanalysis. Specifically, the designed BiOI-ZAIS composite displayed significantly enhanced cathodic photocurrent response compared with individual BiOI microspheres and ZAIS QDs due to its improved charge separation efficiency. Furthermore, the Z-scheme migration mechanism of photoinduced carriers for the BiOI-ZAIS heterostructure was proposed according to the experimental results and energy level analysis. Notably, the fabricated PEC glucose oxidase assay system based on the BiOI-ZAIS heterostructure exhibited satisfactory sensitivity and anti-interference capability with a wide linear range from 0.03 to 30 mu g.mL(-1) and a low detection limit of 0.023 mu g.mL(-1) due to the favorable cathodic photoelectric property of the BiOI-ZAIS composite and the specificity of the enzymatic reaction. Moreover, this research is hoped to inspire interest in the design and development of other high-efficiency and nontoxic Z-scheme heterostructures for elegant PEC bioanalysis.
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