Hybrid multiwalled carbon nanotubes and trioxide tungsten nanoparticles for hydrogen gas sensing

Abstract

The WO3/multiwalled carbon nanotubes (MWNTs) hybrid films were fabricated by spin-coating on an alumina substrate. The structure, morphology, chemical composition and quality of the as-prepared WO3 nanoparticles, functionalized MWNTs and WO3/MWNTs hybrid films were studied by SEM, TEM, XRD, XPS, DLS and Raman spectroscopy methods. Results show that WO3 nanoparticles were nucleated on oxygenated functionalized MWNTs in hybrid suspension. After coating and annealing the films at 350 °C, the hybrid WO3/MWNTs films present rather linear gas sensitivity as a function of hydrogen concentrations at 300 °C. Results are discussed based on surface increase as well as development of two types of Schottky potential barrier height, one at the n-WO3/p-MWNTs hetero-junction and the other at WO3 grain boundaries.

Functionalization of tungsten oxide into MWCNT and its application for sunlight-induced degradation of rhodamine B

“…Recently composites of semiconductors with MWCNTs have been reported [19][20][21][22][23]. It has been reported that MWCNTs could enhance photocatalytic activity.…”

Present Advancement in Production of Carbon Nanotubes and Their Derivatives from Industrial Waste with Promising Applications

“…It could be expected that derivation of novel applications of carbonaceous nanomaterials by integration with other technologies, such as sensor or quantum electronic technology, would cover much broader perspectives (Bittencourt et al, 2006;Espinosa et al, 2007;Balazsi et al, 2008;Hashishin, and Tamaki, 2008;Ghasempour and Zad, 2009). In this review, some typical examples of novel applications of carbonaceous nanomaterials are summarized.…”

Improved H2-sensing performance of nanocluster-based highly porous tungsten oxide films operating at moderate temperature

“…We further compare S 80 and t R 80 of a Pd/SCBD WO 3 film with those of other nano H 2 sensors operating at T sen ≥ 200 • C [25][26][27][28][29][30][31][32][33][34][35]. Data are plotted in Fig.…”