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p-Type PdO nanoparticles supported on n-type WO3 nanoneedles for hydrogen sensing

Annanouch, FE; Roso, S; Haddi, Z; Vallejos, S; Umek, P; Bittencourt, C; Blackman, C; ... Llobet, E; + view all (2016) p-Type PdO nanoparticles supported on n-type WO3 nanoneedles for hydrogen sensing. Thin Solid Films , 618 (Part B) pp. 238-245. 10.1016/j.tsf.2016.08.053. Green open access

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Abstract

We report the synthesis of palladium nanoparticle (NP) decorated WO3 nanoneedles (NNs) employing a single-step, aerosol assisted chemical vapor deposition approach. Two different Pd precursors were investigated in view of optimizing the morphology and the gas sensing performance of the resulting nanostructured films. In particular, palladium acetylacetonate was found to be more suitable than ammonium hexachloropalladate for obtaining n-type WO3 NNs uniformly decorated with well dispersed p-type PdO NPs. The active films could be directly deposited on the electrode area of microelectromechanical system-based resistive transducers. The morphology and chemical composition of the films was investigated by scanning electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy analysis. PdO-decorated WO3 NNs show a response toward hydrogen that is about 680 times higher than that of bare WO3 NNs. Finally, PdO-loaded sensors display extremely low-cross sensitivity to water vapor, which makes them remarkably immune to changes in the background humidity.

Type: Article
Title: p-Type PdO nanoparticles supported on n-type WO3 nanoneedles for hydrogen sensing
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.tsf.2016.08.053
Publisher version: http://dx.doi.org/10.1016/j.tsf.2016.08.053
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Aerosol-assisted chemical vapor desposition; Hydrogen sensor; Palladium oxide; Tungsten oxide; Nanoneedles
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1530787
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