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Electroactive Au@Ag nanoparticles driven electrochemical sensor for endogenous H2S detection.

Yuan Zhao1, Yaxin Yang1, Linyan Cui1

  • 1Key Lab of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China.

Biosensors & Bioelectronics
|June 10, 2018
PubMed
Summary

A new electrochemical sensor uses gold-silver nanoparticles to detect hydrogen sulfide (H2S) with high sensitivity. This advancement offers a sensitive method for studying H2S in biological processes.

Keywords:
Au@Ag NPsElectroactivityHela cellsHydrogen sulfideSensitivity

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Area of Science:

  • Electrochemistry
  • Nanomaterials Science
  • Analytical Chemistry

Background:

  • Hydrogen sulfide (H2S) is a crucial signaling molecule in biological systems.
  • Accurate detection of H2S is vital for understanding its role in various physiological and pathological processes.

Purpose of the Study:

  • To develop a novel and facile electrochemical sensor for the selective and sensitive detection of dissolved hydrogen sulfide (H2S).
  • To investigate the electrochemical reaction mechanism between Au@Ag core-shell nanoparticles and H2S.

Main Methods:

  • Fabrication of Au@Ag core-shell nanoparticles (Au@Ag NPs).
  • Electrochemical characterization using differential pulse voltammetry (DPV).
  • Evaluation of sensor performance including selectivity, sensitivity, linear range, and limit of detection (LOD).

Main Results:

  • The Au@Ag NPs exhibited excellent conductivity and electrochemical reactivity.
  • A redox reaction between Au@Ag NPs and H2S was observed, leading to the oxidation of the Ag shell to Ag2S.
  • The sensor demonstrated a wide linear response range (0.1 nM to 500 nM) and a low LOD (0.04 nM) for H2S detection.

Conclusions:

  • The developed electrochemical sensor provides a highly selective and sensitive method for H2S detection.
  • The sensor shows significant potential for applications in studying the pathological processes involving H2S production.