Convenient detection of H2S based on the photothermal effect of Au@Ag nanocubes using a handheld thermometer as readout

Yingzhou Tao, Yisheng Lin, Fang Luo*, Caili Fu, Cuiying Lin*, Yu He, Zongwei Cai, Bin Qiu, Zhenyu Lin*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

16 Citations (Scopus)


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 ∼450 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.

Original languageEnglish
Article number338211
JournalAnalytica Chimica Acta
Early online date12 Jan 2021
Publication statusPublished - 8 Mar 2021

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

User-Defined Keywords

  • Au@Ag nanocubes
  • Hydrogen sulfide
  • Photothermal effect
  • Temperature
  • Thermometer


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