High performance chemiresistive H2S sensors using Ag-loaded SnO2 yolk-shell nanostructures

Ji Wook Yoon, Young Jun Hong, Yun Chan Kang, Jong Heun Lee

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47 Citations (Scopus)

Abstract

SnO2 yolk-shell spheres uniformly loaded with Ag nanoparticles were prepared by a facile one-pot ultrasonic spray pyrolysis of the source solution and the H2S sensing characteristics were investigated. The Ag-loaded SnO2 yolk-shell spheres showed ultrahigh and reversible response (Ra/Rg - 1 = 613.9, where Ra is the resistance in air and Rg is the resistance in gas) to 5 ppm H 2S with negligible cross-responses (0.6-17.3) to eight other interference gases at 350 °C. In contrast, pure SnO2 spheres with dense inner structures and yolk-shell morphologies did not exhibit a high response/selectivity to H2S nor reversible H2S sensing. The highly sensitive, selective, and reversible H2S sensing characteristics were explained in terms of the gas-accessible yolk-shell morphology and uniform loading of catalytic Ag nanoparticles. Namely, the gas-accessible yolk-shell morphology facilitated the rapid and effective diffusion of the analyte/oxygen gases and the uniform loading of Ag nanoparticles promoted the H2S sensing reaction. This journal is

Original languageEnglish
Pages (from-to)16067-16074
Number of pages8
JournalRSC Advances
Volume4
Issue number31
DOIs
Publication statusPublished - 2014 Apr 14

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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