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

THIN SOLID FILMS

卷:618

Article; Proceedings Paper

Annanouch, F. E.^1,2  Roso, S.¹  Haddi, Z.^1,3  Vallejos, S.⁴  Umek, P.⁵  Bittencourt, C.⁶  Blackman, C.⁷  Vilic, T.¹  Llobet, E.¹ 

[1] Univ Rovira & Virgili, Minos EMaS, Avda Paisos Catalans 26, E-43007 Tarragona, Spain

[2] Univ Toulon & Var, CNRS, Aix Marseille Univ, IM2NP UMR 7334, Marseille, France

[3] Aix Marseille Univ, LSIS, Marseille, France

[4] Brno Univ Technol, SIX Res Ctr, Tech 10, CZ-61600 Brno, Czech Republic

[5] Jozef Stefan Inst, Dept Solid State Phys, Jamova Cesta 39, Ljubljana 1000, Slovenia

[6] Univ Mons, Mat Nova, Parc Initialis,Av N Copernic 1, B-7000 Mons, Belgium

[7] UCL, Dept Chem, 20 Gordon St, London WC1H 0AJ, England

关键词: Aerosol-assisted chemical vapor desposition;    Hydrogen sensor;    Palladium oxide;    Tungsten oxide;    Nanoneedles;   

DOI  :  10.1016/j.tsf.2016.08.053

来源: Elsevier

【 摘 要 】

We report the synthesis of palladium nanopartide (NP) decorated WO3 nanoneedles (NNs) employing a singlestep, 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. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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