Improvement of dynamic gas sensing behavior of SnO2 acicular particles by microwave calcination

Pyeong Seok Cho, Ki Won Kim, Jong Heun Lee

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The CO response time of SnO2 acicular-particle-type gas sensors was shortened to a great extent using rapid microwave calcination. When SnO2 acicular particles were prepared by the slow heating (heating rate: 4.2 °C/min) of a SnC2O4 precursor to the calcination temperature (500 °C) using a conventional furnace, the 90% response time to 30 ppm CO (t90%(air-to-CO)) was 76 s at a sensing temperature of 450 °C. However, the t90%(air-to-CO) decreased markedly down to 5-27 s when the precursor was heated rapidly (heating rate: 25-100 °C/min) using a microwave furnace. The significant shortening of the response time was attributed to the formation of a mesoporous structure in the SnO2 acicular particles due to rapid gas evolution during the decomposition of the SnC2O4 precursor.

Original languageEnglish
Pages (from-to)1034-1039
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume123
Issue number2
DOIs
Publication statusPublished - 2007 May 21

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Keywords

  • Gas Sensors
  • Mesoporous structure
  • Microwave calcination
  • Response time
  • SnO acicular particles

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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