Hydrogen sensors based on carbon nanotubes thin films |
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| Affiliation: | 1. Laboratorio de Sensores, Instituto de Física Aplicada, CSIC, Calle Serrano 144, Madrid 28006, Spain;2. Instituto de Carboquimica, CSIC, Miguel Luesma Castan 4, 50018 Zaragoza, Spain;3. Departamento de Química Inorgánica, Universidad de Zaragoza, ICMA, CSIC, 5009 Zaragoza, Spain;1. Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China;2. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;3. Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai 200062, China;1. Semiconductor Device Research Center, School of Electrical and Computer Engineering, Shiraz University, Shiraz 71345-1585, Iran;2. Department of Electrical and Computer Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada |
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| Abstract: | Single-walled carbon nanotubes (SWNTs) produced by arc-discharge have been researched as resistive gas sensors for H2 detection. Raw as well as modified single-walled carbon nanotubes were utilised as sensor material. Two types of modification treatments were carried out on the as grown SWNT material; chemical functionalization with palladium and doping with palladium by sputtering.CNTs were deposited on alumina substrates by airbrush. Two different alumina substrates (with and without heater element) were used to obtain the sensor devices.Conductance measurements were carried out in a N2 constant flow for H2 detection. The results demonstrate that the CNTs are p-type semiconductor materials, increasing their resistance with reducing gases. SWNTs functionalized with Pd show the best response when exposed to H2 at room temperature. |
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