期刊
CHEMICAL ENGINEERING JOURNAL
卷 441, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136073
关键词
Photoelectrochemical sensor; Double heterostructure; CdS nanowires; ZnS quantum dots; Turn-on assay of mercury (II); Visible light illumination
资金
- National Natural Science Foundation of China [22074079]
- opening foundation from School of Chemistry and Chemical Engineering, Henan Normal University, P.R. China
An ultrasensitive and selective photoelectrochemical platform has been developed for determining Hg2+ using CdS nanowires and ZnS quantum dots synergistically. The platform shows great potential for wide applications in detecting heavy metals like Hg2+ with turn-on signal output.
An ultrasensitive and selective photoelectrochemical (PEC) platform has been developed for determining Hg2+ with turn-on signal output by synergistically using CdS nanowires (NWs) and ZnS quantum dots (QDs). CdS NWs was first prepared and then deposited with ZnS QDs to yield ZnS/CdS nanocomposite with type-II heterostructure. It was found that the as-constructed ZnS/CdS heterostructure can exhibit excellent photoelectrochemical characteristics by separately employing CdS NWs and ZnS QDs as the photosensitizer and Hg2+recognition probe. What's more, the constructed analysis platform could display specifically enhanced photocurrent responses to Hg2+ under the visible light via the selective ion-exchange reaction. The in-situ formation of ternary HgS/ZnS/CdS could be thus expected with double type-II heterostructures so as to further enhance the transferring and separation of charges. A linear response can be achieved for Hg2+ in the concentration range from 0.0010 to 5.0 nM, with a detection limit of 0.40 pM. Moreover, the application feasibility of the developed sensor with ZnS/CdS heterostructure could be testified by detecting Hg2+ ions in environmental waters. Such a route of in-situ formation of double type-II heterostructure might promise the wide applications for designing different visible light-driven PEC sensors for probing heavy metals like Hg2+ with the turn-on signal output.
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