Convenient detection of H2S based on the photothermal effect of Au@Ag nanocubes using a handheld thermometer as readout.
Anal Chim Acta
; 1149: 338211, 2021 Mar 08.
Article
em En
| MEDLINE
| ID: mdl-33551050
ABSTRACT
Hydrogen sulfide (H2S), as a hazardous gas, is often found around dump areas. Long term exposure can cause harm to health, it is highly necessary to develop some simple and sensitive methods for on-site H2S detection. Herein, a convenient photothermal assay has been designed for the quantitation of H2S using a handheld thermometer as readout. Au@Ag nanocubes (Au@Ag NCs), a core-shell nanocomposite with strong light absorption at â¼450 nm, was chosen as a novel photothermal agent in this study. Under the laser irradiation at 450 nm, the Au@Ag NCs show a strong photothermal effect, and a significant temperature enhancement can be measured by the thermometer easily. The presence of H2S can lead to the deposition of sulfur onto Au@Ag NCs, altering the localized surface plasmon resonance absorption, size, surface composition, and morphology of Au@Ag NCs and hence leading to the reduction of photothermal effect. The change of the temperature has a linear relationship with the H2S concentration in the range of 0.5-80.0 µM with a detection limit of 0.35 µM. By combining with simple sample purification procedures, the developed method has been applied to detect H2S in garbage odor gas with satisfactory results.
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MEDLINE
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En
Ano de publicação:
2021
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Article