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Title: Electrical characterization of H{sub 2}S adsorption on hexagonal WO{sub 3} nanowire at room temperature

We have characterized the electrical transport properties of Au/WO{sub 3} nanowire/Au devices in ambient air and gaseous H{sub 2}S to investigate the adsorption kinetics of H{sub 2}S molecules on the surface of WO{sub 3} nanowire at room temperature. The WO{sub 3} nanowire devices exhibit increasing linear conductance and electrical hysteresis in H{sub 2}S. Furthermore, the contact type between Au electrode and WO{sub 3} nanowire can be converted from original ohmic/Schottky to Schottky/ohmic after being exposed to H{sub 2}S. These results suggest that adsorbed H{sub 2}S molecules are oxidized by holes to form hydrogen ions and S atoms, which will result in formation of hydrogen tungsten bronze and desorption of previously chemically adsorbed H{sub 2}O molecules. Adsorbed H{sub 2}S molecules can also oxidize previously adsorbed and ionized oxygen, which will release the electrons from the ionized oxygen and then weaken upward band bending at the surface of WO{sub 3} nanowire.
Authors:
; ; ; ; ; ; ;  [1]
  1. Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, College of Physics and Information Science, Hunan Normal University, Changsha 410081 (China)
Publication Date:
OSTI Identifier:
22308185
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ADSORPTION; ATOMS; DESORPTION; ELECTRIC CONDUCTIVITY; ELECTRODES; GOLD; HOLES; HYDROGEN IONS; HYDROGEN SULFIDES; HYSTERESIS; MOLECULES; NANOWIRES; OXYGEN; SCHOTTKY BARRIER DIODES; SURFACES; TEMPERATURE RANGE 0273-0400 K; TUNGSTEN BRONZE; TUNGSTEN OXIDES