Enhanced H2S sensing characteristics of SnO2 nanowires functionalized with CuO

In Sung Hwang, Joong Ki Choi, Sun Jung Kim, Ki Young Dong, Jae Hong Kwon, Byeong Kwon Ju, Jong Heun Lee

Research output: Contribution to journalArticle

162 Citations (Scopus)

Abstract

The CuO-functionalized SnO2 nanowire (NW) sensors were fabricated by depositing a slurry containing SnO2 NWs on a polydimethylsiloxane (PDMS)-guided substrate and subsequently dropping Cu nitrate aqueous solution. The CuO coating increased the gas responses to 20 ppm H2S up to ∼74-fold. The Ra/Rg value of the CuO-doped SnO2 NWs to 20 ppm H2S was as high as 809 at 300 °C, while the cross-gas responses to 5 ppm NO2, 100 ppm CO, 200 ppm C2H5OH, and 100 ppm C3H8 were negligibly low (1.5-4.0). Moreover, the 90% response times to H2S were as short as 1-2 s at 300-400 °C. The selective detection of H2S and enhancement of the gas response were attributed to the uniform distribution of the sensitizer (CuO) on the surface of the less agglomerated network of the SnO2 NWs.

Original languageEnglish
Pages (from-to)105-110
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume142
Issue number1
DOIs
Publication statusPublished - 2009 Oct 12

Keywords

  • CuO-SnO
  • Gas sensors
  • HS detection
  • Selectivity
  • SnO nanowires

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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