期刊
BIOSENSORS & BIOELECTRONICS
卷 149, 期 -, 页码 -出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2019.111843
关键词
Self-powered; Photoelectrochemical; Aptasensor; E. coli O157:H7
类别
资金
- National Key Research and Development Program of China [2017YFA0700500, 2018YFA0209101]
- Science Fund for Creative Research Groups of the National Natural Science Foundation of China [61821002, 11734005, 61704024, 11604114, 91644103, 41603104]
- Key research and development program of Jiangsu Province [BK20170696]
In this paper, the hydrothermally grown ZnO nanowire array (NWs) was modified by Au nanoparticles (NPs) and CdS quantum dots (QDs) to construct a high-performance photoelectrochemical (PEC) electrode. The aligned ZnO NWs, which decorated Au NPs and CdS QDs have the effective light absorption range from UV to visible region. This hybrid structure provided a self-powered PEC electrode with a favorable energy-band configuration for fast charge separation and transportation. Meanwhile, the Au NPs and CdS QDs also made increase of the surface area to improve the immobilization of the analytes. After assembling aptamer as recognition element, this composite nanoarray was further developed as a self-powered PEC biosensor by synergizing above multiple enhancement factors. The PEC aptasensor exhibited a rapid response in a wide linear range of 10-10(7) CFU/mL with the detection limit as low as 1.125 CFU/mL to Eschertchia coli O157:H7 (E. coli O157:H7). This approach would offer an alternative PEC transduction for fast environment monitoring and clinical diagnosis related to pathogenic bacteria.
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