One-pot hydrothermal synthesis of CuO-ZnO composite hollow spheres for selective H 2S detection

Sun Jung Kim, Chan Woong Na, In Sung Hwang, Jong Heun Lee

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

Pure ZnO and CuO-ZnO composite hollow spheres were prepared by one-pot, glucose-mediated hydrothermal reaction with subsequent heat treatment. The pure ZnO hollow spheres could selectively detect C 2H 5OH at 475 °C. The CuO-ZnO hollow spheres prepared from the solutions with the compositions of [Cu 2+]/([Cu 2+] + [Zn 2+]) = 0.02 and 0.04 showed high responses to 5 ppm H 2S (R a/R g = 13.3 and 32.4, R a: resistance in air, R g: resistance in gas) with negligible cross responses to 100 ppm C 2H 5OH, C 3H 8, CO and H 2 (R a/R g = 1.4-1.8) at 336°C. They also showed selective C 2H 5OH detection at 475°C. The dual selective detection of H 2S and C 2H 5OH by the composite particles was due to electrochemical interactions with H 2S of nano-scale p(CuO)-n(ZnO) junctions within the hollow spheres.

Original languageEnglish
Pages (from-to)83-89
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume168
DOIs
Publication statusPublished - 2012 Jun 20

Keywords

  • Gas sensors
  • H S detection
  • Hollow spheres
  • Selectivity
  • ZnO-CuO

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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