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Pd-WO3/reduced graphene oxide hierarchical nanostructures as efficient hydrogen gas sensors
, Article International Journal of Hydrogen Energy ; Volume 39, Issue 15 , 15 May , 2014 , Pages 8169–8179 ; Iraji Zada, A. (Azam) ; Akhavana, O. (Omid) ; Ghasemic, S. (Shahnaz) ; Gholami, M. R. (Mohammad Reza) ; Sharif University of Technology
Abstract
Pd–WO3 nanostructures were incorporated on graphene oxide (GO) and partially reduced graphene oxide (PRGO) sheets using a controlled hydrothermal process to fabricate effective hydrogen gas sensors. Pd–WO3 nanostructures showed ribbon-like morphologies and Pd–WO3/GO presented an irregular nanostructured form, while Pd–WO3/PRGO exhibited a hierarchical nanostructure with a high surface area. Gas sensing properties of thin films of these materials were studied for different hydrogen concentrations (from 20 to 10,000 ppm) at various temperatures (from room temperature to 250 °C). Although adding GO in the Pd–WO3, after hydrothermal process could increase the film conductivity, gas sensitivity...