Metallic nanoparticles functionalizing carbon nanotube networks for gas sensing applications
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We report the fabrication of carbon nanotube (CNT) based gas sensors functionalized with different metallic nanoparticles (NPs) (Au, Pd, Ag) with exceptionally high responses towards four test gases (NH3, CO2, CO and ethanol). The CNT networks were fabricated through a low cost spray deposition process while the NPs were deposited by a thermal evaporation process. CNT based gas sensors functionalized with Au with a nominal thickness of 1.0 nm showed superior response towards NH3, CO and ethanol. The sensors' normalized responses reached 92%, 22% and 32% with concentrations of 100 ppm, 50 ppm and 100 ppm for NH3, CO and ethanol respectively. CNT based gas sensors functionalized with Pd with a nominal thickness of 1.5 nm showed the best performance with CO2. The normalized response reached 3%, 6%, 12% and 17% with concentrations of 500 ppm, 1000 ppm, 2500 ppm and 5000 ppm of CO2 respectively. We also investigated the morphological and optical changes that occur to the NPs upon thermal treatment. Functionalization of CNT films deposited on glass with Au and Ag showed surface plasmon resonance effects that are dependent on the nominal thickness of the functionalization layer. © 2014 IOP Publishing Ltd.
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Highly sensitive and selective carbon nanotube-based gas sensor arrays functionalized with different metallic nanoparticles Abdelhalim A; Winkler M; Loghin F; Zeiser C; Lugli P; Abdellah A (Elsevier, 2015)We present the fabrication and characterization of selective CNT-based gas sensor, which is capable of discriminating between four test gases (NH3, ethanol, CO and CO2). Different metals are utilized in order to alter the ...
Abdelhalim A; Loghin F; Winkler M; Zeiser C; Abdellah A; Lugli P (Institute of Electrical and Electronics Engineers Inc., 2015)We report a highly reproducible Carbon nanotube (CNT) based gas sensor arrays, which are able to discriminate between NH3, CO, CO2 and ethanol. Each sensor array is composed of four sensing elements where metallic nanoparticles ...
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