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Organic-vapor detection using carbon-nanotubes nanocomposite microacoustic sensors

TitleOrganic-vapor detection using carbon-nanotubes nanocomposite microacoustic sensors
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2005
AuthorsPenza, Michele, Tagliente M.A., Aversa Patrizia, and Cassano Gennaro
JournalChemical Physics Letters
Volume409
Pagination349-354
ISSN00092614
KeywordsAcoustic surface wave devices, Carbon nanotubes, Electric charge, Electron guns, Light reflection, Linear dependence, Microacoustic sensors, Microsensors, molecular dynamics, Nanostructured materials, Organic-vapor detection, Oscillating frequency, X ray analysis
Abstract

We have developed highly sensitive microacoustic vapor sensors based on surface acoustic waves (SAWs) ST,X quartz 315 and 433 MHz two-port resonator oscillators. A nanocomposite film of single-walled carbon nanotubes (SWCNTs) embedded in a cadmium arachidate (CdA) amphiphilic matrix was prepared by Langmuir-Blodgett technique with a fixed SWCNTs weight filler-content as nanostructured and nanosensing interface, for vapor detection at room temperature. The structural properties and surface morphology of the nanocomposite have been examined by X-ray Specular Reflectivity and Field-Emission Gun Scanning Electron Microscopy, respectively. The measured acoustic sensing characteristics indicate that the SAW sensitivity to polar and nonpolar tested organic molecules (ethanol, ethylacetate, and toluene) of the SWCNTs/CdA nanocomposite is up to two times higher than that of unembedded CdA device; also the SWCNTs/CdA nanocomposite vapor sensitivity results significantly enhanced with respect to traditional organic molecular cavities materials and increases with SAW oscillating frequency with a linear dependence in the frequency change response up to a very low sub-ppm limit of detection. © 2005 Elsevier B.V. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-20444500532&doi=10.1016%2fj.cplett.2005.05.005&partnerID=40&md5=cd4087b2e2d20dd10e5dfdd0d6e9c082
DOI10.1016/j.cplett.2005.05.005
Citation KeyPenza2005349