Ultraselective and ultrasensitive detection of H2S in highly humid atmosphere using CuO-loaded SnO2 hollow spheres for real-time diagnosis of halitosis

Kwon Il Choi, Hyo Joong Kim, Yun Chan Kang, Jong Heun Lee

Research output: Contribution to journalArticle

89 Citations (Scopus)


The CuO-loaded SnO2 hollow spheres were prepared by ultrasonic spray pyrolysis and their H2S sensing characteristics in dry and humid atmospheres for the diagnosis of halitosis were investigated. The loading of CuO to SnO2 hollow spheres decreased the humidity dependence of H2S sensing characteristics down to negligible level, increased the gas response (ratio of resistance to air and gas) in highly humid atmosphere (relative humidity 80%) to 1 ppm H2S from 3.13 to 22.4, and enhanced the selectivity to H2S over CO, NH3, CH 3COCH3, C6H6, CH3C 6H5, (CH3)2C6H 4, and NO at 300 C. Ultraselective and ultrasensitive detection of H2S under highly humid atmosphere with negligible interferences from other biomarker gases provides a promising and reliable analysis tool for real-time diagnosis of halitosis from exhaled breath.

Original languageEnglish
Pages (from-to)371-376
Number of pages6
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 2014 Apr 1



  • CuO-loaded SnO
  • Gas sensor
  • HS
  • Halitosis
  • Humidity dependence

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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