Highly sensitive and fast responding CO sensor using SnO2 nanosheets

Chang Sup Moon, Hae Ryong Kim, Graeme Auchterlonie, John Drennan, Jong Heun Lee

Research output: Contribution to journalArticle

136 Citations (Scopus)

Abstract

A highly sensitive and fast responding CO sensor was fabricated from a sheet-like SnO2. The SnO sheets were prepared by a room temperature reaction between SnCl2, hydrazine and NaOH, and they were subsequently oxidized into SnO2 sheets at high temperature (600 °C). The morphology and size of the SnO2 sheets could be controlled during the formation of SnO, which influence the sensor response (Ra/Rg) and response time to a great extent. The sensor response of SnO nanosheets to 10 ppm CO was enhanced up to 2.34, and the 90% sensor response time could be reduced to 6 s, which are significantly higher and shorter than those of SnO2 powders (1.57 and 88 s), respectively. The realization of both a high sensitivity and rapid response were explained in terms of rapid gas diffusion onto the entire sensing surface due to the less-agglomerated and very thin structure of SnO2 nanosheets and the catalytic effect of Pt.

Original languageEnglish
Pages (from-to)556-564
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume131
Issue number2
DOIs
Publication statusPublished - 2008 May 14

Keywords

  • Gas sensor
  • Nanosheets
  • SnO
  • SnO
  • Solution reduction method

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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