Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 6, Pages 5778-5784Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c00592
Keywords
PEC detection; S2-; signal-on strategy; nonstoichiometric Bi2O2.33; type-II heterojunction
Funding
- National Natural Science Foundation of China [51674298]
- National Key Research and Development Program of China [2018YFE0203400]
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A signal-on strategy for soluble sulfide detection has been designed using a Bi2O2.33 nanostructure-based photoanode, which promotes sensitivity and extends light-harvesting ability by inducing the formation of surface Bi2S2.33 through specific interaction with S2-. This strategy allows for selective detection of sulfide ions, with a low detection limit of 0.22 mu M and a wide linear range from 1 to 1000 mu M, making the photoanode a potential alternative for trace sulfide monitoring.
Since soluble sulfide ions (S-2(-)) even in low concentration can cause irreversible damage to human beings and the ecosystem, effective monitoring of S2- becomes a priority. Thus, a signal-on strategy for soluble sulfide detection has been designed using a Bi2O2.33 nanostructure-based photoanode. The enlarged PEC activity of nonstoichiometric Bi2O2.33 promotes the sensitivity within the detection process. The specific interaction with S2- induces the in situ formation of surface Bi2S2.33, which extends the light-harvesting ability and inhibits charge recombination. As a result, the PEC signal increases gradually with the increased S2-, making the selective signal-on strategy available. A low detection limit of 0.22 mu M and superior wide linear range (1-1000 mu M) are obtained, making the photoanode a potential alternative in trace sulfide monitoring.
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