Layered SAW gas sensor with single-walled carbon nanotube-based nanocomposite coating

M. Penza, P. Aversa, G. Cassano, W. Wlodarski, K. Kalantar-Zadeh

Research output: Contribution to journalArticle

79 Citations (Scopus)


A Surface acoustic wave (SAW) sensor using a ZnO guiding layer on 36° Y-cut X-propagation LiTaO3piezoelectric substrate has been designed and fabricated. Single-walled carbon nanotube (SWCNT)-based nanocomposite coatings have been deposited using the Langmuir-Blodgett technique. The sensor was tested towards H2, NH3, NO2gases, in the range of 0.030-1%, 30-1000 ppm, 1-10 ppm, respectively. The output signal was the phase of the SAW device, which was monitored using a network analyzer. The developed sensor has a high sensitivity, good repeatability and low detection limit at sub-ppm levels, at room temperature. The experimental results obtained are compared to a theoretical model and the SAW gas sensing mechanisms are discussed with the acoustoelectric effect that appears to be dominant in the SAW response. © 2007 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)168 - 178
Number of pages11
JournalSensors and Actuators, B: Chemical
Issue number1
Publication statusPublished - 20 Oct 2007
Externally publishedYes


All Science Journal Classification (ASJC) codes

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

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