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

56 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

Keywords

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

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

Fingerprint Dive into the research topics of 'Highly selective and sensitive detection of trimethylamine using wo3 hollow spheres prepared by ultrasonic spray pyrolysis'. Together they form a unique fingerprint.

  • Cite this