International Journal of Hydrogen Energy, Vol.42, No.12, 8392-8398, 2017
Room temperature hydrogen gas sensors of functionalized carbon nanotubes based hybrid nanostructure: Role of Pt sputtered nanoparticles
Fast detection of H-2 gas at room temperature has constantly remained a challenge. The metal-oxide based gas sensors have shown excellent sensing properties for gases like H-2, NO, CO and NH3. In the present work, the H-2 gas sensing characteristics of multiwalled carbon nanotubes based hybrid sensor (F-MWCNTs/TiO2/Pt) has been reported. The fabricated sensor shows 3.9% sensitivity for low concentration i.e. 0.05% of H-2 with good repeatability and stability at room temperature. The sensing response of F-MWCNTs/TiO2/ Pt is interrelated to change in their resistance on the introduction of H-2 gas and this phenomenon is required for deep understanding the effect of H-2 adsorption on their electronic conduction. The improvement in sensitivity of F-MWCNTs/TiO2/Pt as compared to MWCNTs/TiO2 towards H-2 is because of the catalytic role of dispersed Pt nanoparticles deposited by sputtering. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.