Abstract
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A thin-film bulk acoustic resonator (TFBAR) based on a vibrating membrane of <formula formulatype="inline"><tex>$\hbox{AlN/Si}_{3}\hbox{N}_{4}$</tex> </formula> has been fabricated onto a silicon substrate and functionally characterized as gas sensor at a resonating frequency of 1.045 GHz. This novel TFBAR-based gas sensor has been functionalized by a sensing nanocomposite layer, prepared by a Langmuir–Blodgett (LB) technique, of single-walled carbon nanotubes (SWCNTs) embedded in a host matrix of organic material of cadmium arachidate. High-performance gas detection at room temperature of a SWCNT-coated TFBAR sensor has been reported. The sensing device exhibits high sensitivity (e.g., acetone: 12 kHz/ppm; ethylacetate: 17.3 kHz/ppm), fast response (within 2–3 min), slow reversibility (within 1 h), and good repeatability (<formula formulatype="inline"><tex>$\leq \hbox{5}\%$</tex> </formula> variation) of response toward tested organic vapors of acetone, ethylacetate, and toluene. </para>
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