Carbon nanotubes as SAW chemical sensors materials

M. Penza, F. Antolini, M. Antisari Vittori

Research output: Contribution to journalArticle

153 Citations (Scopus)

Abstract

We have designed, fabricated and characterized surface acoustic waves (SAWs) sensors coated by either single-wall carbon nanotubes (SWCNTs) or multi-wall carbon nanotubes (MWCNTs) for chemical detection of volatile organic compounds (VOCs), at room temperature. The carbon nanotubes (CNTs) were deposited by a spray-painting method onto ST,X-quartz substrates, coated by SiO2films, used to implement the SAW sensors configured as 433.92MHz two-port resonator-based oscillators. Upon individual exposure to tested VOCs such as ethanol, ethylacetate and toluene in nitrogen, the resonance frequency of the SAW oscillating sensor exhibits high downshift of a few hundreds (a few tens) of kHz for SWCNTs (MWCNTs) films dispersed into solvent of ethanol. High sensitivity of carbon nanotubes-coated SAW sensors has been achieved, at room temperature. The selectivity to VOCs under test can be controlled by the type of organic solvent used to disperse the carbon nanotubes as sensing materials onto SAW sensors. Preliminarily, some sensing mechanisms between chemical species to be detected and the carbon nanotubes will be discussed. © 2003 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)47 - 59
Number of pages13
JournalSensors and Actuators, B: Chemical
Volume100
Issue number1-2
DOIs
Publication statusPublished - 1 Jun 2004
Externally publishedYes

    Fingerprint

All Science Journal Classification (ASJC) codes

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

Cite this