Au/AgI Dimeric Nanoparticles for Highly Selective and Sensitive Colorimetric Detection of Hydrogen Sulfide

The development of Au/AgI dimeric nanoparticles (NPs) is reported for highly selective colorimetric detection of hydrogen sulfide (H2S). The detection mechanism is designed by taking advantage of the chemical transformation of AgI to Ag2S upon reacting with sulfide, which leads to a shift in the pla...

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Bibliographic Details
Published in:Advanced functional materials 2018-06, Vol.28 (26), p.n/a
Main Authors: Zeng, Jingbin, Li, Min, Liu, Ao, Feng, Fan, Zeng, Teng, Duan, Wei, Li, Mengmeng, Gong, Mingfu, Wen, Cong‐Ying, Yin, Yadong
Format: Article
Language:English
Subjects:
agarose gel strips
colorimetric detection
Colorimetry
Cultivation
dimeric nanoparticles
Gels
Gold
Hydrogen sulfide
Materials science
Nanoparticles
Organic chemistry
surface plasmon resonance
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Summary:The development of Au/AgI dimeric nanoparticles (NPs) is reported for highly selective colorimetric detection of hydrogen sulfide (H2S). The detection mechanism is designed by taking advantage of the chemical transformation of AgI to Ag2S upon reacting with sulfide, which leads to a shift in the plasmonic band of the attached Au NPs. The plasmonic shift is accompanied by a color change of the solution from purplish red to blue and finally to light green depending on the concentration of sulfide, thus enables a naked‐eye readout and UV–vis quantitation of the sulfide exposure. The Au/AgI dimeric NPs are further immobilized in agarose gels to produce test strips, which can be used for both naked‐eye readout and quantitative detection of sulfide using UV–vis spectroscopy thanks to its transparency in the visible region. Compared to commercial Pb(Ac)2 test papers, the agarose gel strip has superior performance for detecting sulfide in terms of sensitivity, selectivity, stability, and fidelity. The agarose gel is also capable of detecting gaseous H2S at important concentration thresholds, suggesting its practicability in real life applications. The potential of agarose gels is further highlighted by its ability in the enrichment and colorimetric detection of gaseous H2S released during cell cultivation. A highly selective colorimetric method for sulfide detection is developed based on the unique dimeric structure of Au/AgI hybrid nanoparticles and their plasmonic shift during the chemical transformation of AgI to Ag2S upon exposure to hydrogen sulfide.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201800515