期刊
ACS SENSORS
卷 4, 期 10, 页码 2724-2729出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.9b01204
关键词
photoelectrochemical; plasmon; silver nanoparticles; sensing; formaldehyde
资金
- National Natural Science Foundation of China [21505117, 21675140, 21775135]
- Natural Science Foundation of Jiangsu Province [BK20161309]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX17_0686]
- Joint Open Fund of Jiangsu Collaborative Innovation Center for Ecological Building Material and Environmental Protection Equipments and Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [JH201852]
- Qinglan Project of Jiangsu Province
Trace concentration of formaldehyde can damage human health and environment. Consequently, it is of great significance to develop an ultrasensitive sensor for its determination. Herein, an ingenious and efficient photoelectrochemical sensor for formaldehyde was constructed by amorphous TiO2 hollow spheres incorporated with Ag+ ions, which were brought about by silica template etching and then the exchange of Ag+/Na+ ions. The amorphous TiO2 acted the dual role of Ag+ ion probe carriers and photoelectric materials. Upon exposure to the increased concentration of formaldehyde, the Ag nanoparticles were produced in situ, and photocurrent amplification was then achieved in a proportional manner. It is attributed to the injection of hot electrons from plasmonic Ag nanoparticles into the conduction band of amorphous titanium dioxide and therefore enhanced the photocurrent. The linear relationship between 1 and 400 pmol L-1 resulted from the enhanced photocurrent and increased formaldehyde, and the detection limit was 0.4 pmol L-1. Benefiting from an in situ and unique photoelectrochemical sensor exhibited many advantages such as sensitivity, selectivity, cost-effectiveness, fabrication, low power consumption, and stability.
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