Organic vapor detection by QCM sensors using CNT-composite films

TitleOrganic vapor detection by QCM sensors using CNT-composite films
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2012
AuthorsAlvisi, Marco, Aversa P., Cassano Gennaro, Serra Emanuele, Tagliente M.A., Schioppa M., Rossi R., Suriano Domenico, Piscopiello E., and Penza Michele
JournalLecture Notes in Electrical Engineering
Volume109 LNEE
ISBN Number9781461409342
KeywordsAcetone, Active material, Alumina, Alumina substrates, Buffer materials, Cadmium, Carbon films, Carbon nanotubes, Chemical sensors, Chemical vapor deposition, Ethanol, Ethyl-acetate, Fast response, Fe catalyst, Gas detectors, High sensitivity, Langmuir Blodgett techniques, Layered films, m-Xylene, Mass sensitivity, Methanol, Microsystems, Multilayers, Nanocomposite films, Nanomaterial, Natural frequencies, Organic-vapor detection, QCM sensors, Quartz, Quartz crystal microbalances, Quartz substrate, Range detection, Room temperature, Sensing property, Substrates, Ternary systems, Toluene, Vapors, Xylene

A Quartz Crystal Microbalance (QCM) gas sensor coated with carbon nanotubes (CNTs) layered films as chemically interactive nanomaterial is described. A QCM resonator integrated on AT-cut quartz substrate has been functionally characterized as oscillator at the resonant frequency of 10 MHz. The CNTs have been grown by chemical vapor deposition (CVD) system onto alumina substrates, coated with 2.5 nm thick Fe catalyst, at a temperature of 750°C in H 2/C 2H 2 gaseous ambient as active materials for gas sensors. CNTs multilayers, with and without buffer layer of cadmium arachidate (CdA), have been prepared by the Langmuir-Blodgett (LB) technique to coat at the double-side the QCM sensors for organic vapor detection, at room temperature. It was demonstrated that the highest mass sensitivity has been achieved for CNTs multilayer onto CdA buffer material due to the greatest gas adsorbed mass. The sensing properties of the CNTs-sensors at enhanced mass sensitivity have been investigated for different vapors of ethanol, methanol, acetone, m-xylene, toluene and ethylacetate in a wide range of concentration from 10 to 800 ppm. The CNTs-based QCM-sensors exhibit high sensitivity (e.g., 5.55 Hz/ppm to m-xylene of the CNTs-multilayer) at room temperature, fast response, linearity, reversibility, repeatability, low drift of the baseline frequency, potential sub-ppm range detection limit. © 2012 Springer Science+Business Media, LLC.


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