Ultraselective and ultrasensitive detection of trimethylamine using MoO3 nanoplates prepared by ultrasonic spray pyrolysis

Yoon Ho Cho, You Na Ko, Yun Chan Kang, Il Doo Kim, Jong Heun Lee

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83 Citations (Scopus)


An ultraselective and ultrasensitive trimethylamine (TMA) sensor was achieved using MoO3 nanoplates-prepared by ultrasonic spray pyrolysis followed by a heat treatment at 450 C. The small and thin MoO3 nanoplates with gas-accessible structures showed an unusually high response to 5 ppm TMA (ratio of resistance to air and gas = 373.74) at 300 C with detection limit as low as 45 ppb. Moreover, the ratios of the cross-responses to interfering gases (i.e., 5 ppm C2H5OH, CO, CH4, C3H8, H2, and NO2) to the response to 5 ppm TMA were extremely low (0.008-0.016). The source of the ultraselective and highly sensitive detection of TMA with negligible interference from other gases is discussed with respect to the acid/base properties, size, and morphology of the MoO3 sensing materials.

Original languageEnglish
Pages (from-to)189-196
Number of pages8
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 2014 May


  • Gas sensors
  • MoO nanoplates
  • Selective detection
  • Trimethylamine
  • Ultrasonic spray pyrolysis

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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