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.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Atomic and Molecular Physics, and Optics
- Surfaces and Interfaces
- Condensed Matter Physics
Penza, M., Tagliente, M. A., Aversa, P., & Cassano, G. (2005). Organic-vapor detection using carbon-nanotubes nanocomposite microacoustic sensors. Chemical Physics Letters, 409(4-6), 349 - 354. https://doi.org/10.1016/j.cplett.2005.05.005