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 H2/C2H2 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 three different vapors of ethylacetate, acetone and m-xylene in the range of gas 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.
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
This is a preview of subscription content, log in to check access.
Ballantine DS, White RM, Martin SJ, Ricco AJ, Zellers ET, Frye GC, Wohltjen H (1997) Acoustic wave sensors. Academic Press, San DiegoGoogle Scholar
Rabe J, Buttgenbach S, Schroder J, Hauptmann P (2003) Monolithic miniaturized quartz microbalance array and its application to chemical sensor systems for liquids. IEEE Sens J 3(4):361–368CrossRefGoogle Scholar
Penza M, Tagliente MA, Aversa P, Cassano G, Capodieci L (2006) Single-walled carbon nanotubes nanocomposite microacoustic organic vapor sensors. Mater Sci Eng C 26:1165–1170CrossRefGoogle Scholar
Penza M, Tagliente MA, Aversa P, Cassano G (2005) Organic vapor detection using carbon nanotube composites microacoustic sensors. Chem Phys Lett 409:349–354CrossRefGoogle Scholar
Penza M, Tagliente MA, Aversa P, Re M, Cassano G (2007) The effect of purification of single-walled carbon nanotube bundles on the alcohol sensitivity of nanocomposite Langmuir-Blodgett films for SAW sensing applications. Nanotechnology 18:185502CrossRefGoogle Scholar
Penza M, Aversa P, Cassano G, Wlodarski W, Kalantar-zadeh K (2007) Layered SAW gas sensor with single-walled carbon nanotube based nanocomposite coating. Sensor Actuat B 127:168–178CrossRefGoogle Scholar
Chen H-W, Wu R-J, Chan K-H, Sun Y-L, Su P-G (2005) The application of CNT/nafion composite material humidity sensing measurement. Sensor Actuat B 104:80–84CrossRefGoogle Scholar
Consales M, Campopiano S, Cutolo A, Penza M, Aversa P, Cassano G, Giordano M, Cusano A (2006) Sensing properties of buffered and not buffered carbon nanotubes by fiber optic and acoustic sensors. Meas Sci Technol 17:1220–1228CrossRefGoogle Scholar
Su P-G, Tsai J-F (2009) Low-humidity sensing properties of carbon nanotubes measured by a quartz crystal microbalance. Sensor Actuat B 135:506–511CrossRefGoogle Scholar