Highly selective and sensitive detection of trimethylamine using wo3 hollow spheres prepared by ultrasonic spray pyrolysis

Yoon Ho Cho, Yun Chan Kang, Jong Heun Lee

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

WO3 hollow spheres were prepared by ultrasonic spray pyrolysis of a citric-acid-containing precursor solution, and their trimethylamine-sensing characteristics were investigated. The WO3 hollow spheres showed a high response to 5 ppm of trimethylamine (Ra/Rg = 56.9, Ra: resistance in air, Rg: resistance in gas) with low cross-responses to 5 ppm C2H5OH, CO, CH4, C3H8, H2, NH3, and NO2. The high gas response observed was explained by the effective electron depletion of small primary particles and the enhanced gas accessibility of hollow structures with thin and porous shells. The enhanced trimethylamine selectivity was discussed in terms of the interaction between basic analyte gas and acidic sensing materials.

Original languageEnglish
Pages (from-to)971-977
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume176
DOIs
Publication statusPublished - 2013 Apr 2

Fingerprint

Spray pyrolysis
pyrolysis
sprayers
hollow
ultrasonics
Gases
Ultrasonics
gases
citric acid
Citric acid
Carbon Monoxide
Citric Acid
depletion
selectivity
trimethylamine
Electrons
air
Air
electrons
interactions

Keywords

  • Gas sensors
  • Selective detection
  • Trimethylamine
  • Ultrasonic spray pyrolysis
  • WO3 hollow spheres

ASJC Scopus subject areas

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

Cite this

Highly selective and sensitive detection of trimethylamine using wo3 hollow spheres prepared by ultrasonic spray pyrolysis. / Ho Cho, Yoon; Chan Kang, Yun; Lee, Jong Heun.

In: Sensors and Actuators, B: Chemical, Vol. 176, 02.04.2013, p. 971-977.

Research output: Contribution to journalArticle

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