Hydrothermal synthesis and chromic properties of hexagonal WO3 nanowires

doi:10.1088/1674-1056/20/3/036103

Abstract This paper reports that highly purified hexagonal WO₃ nanowires are synthesized by a simple hydrothermal method. The as-synthesized WO₃ nanowires are investigated in detail by ultraviolet–visible–near infrared spectroscopy and electrical transport measurements under different conditions. It finds that the optical band gap and the diffuse reflection coefficient in the wavelength region above 450 nm of WO₃ nanowires decrease observably upon exposure to ultraviolet light or NH₃ gas. It is also found that there are electrons being trapped or released in individual WO₃ nanowires when scanning bias voltage in different directions upon exposure to ultraviolet and NH₃ gas. The experimental results suggest that the chromic properties might be attributed to the injection/extraction of hydrogen ions induced by ultraviolet light irradiation in air or creation/annihilation of oxygen vacancies induced by NH₃ gas exposure, which serve as colour centres and trap electrons as polarons. The experimental results also suggest that the hexagonal WO₃ nanowires will be a good candidate for sensing reduced gas such as NH₃.

Keywords: hydrothermal method nanostructures chromic property gas adsorption

Received: 01 February 2010
Revised: 23 September 2010
Accepted manuscript online:

PACS:	61.46.Km	(Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires))
	61.72.jd	(Vacancies)
	73.23.-b	(Electronic transport in mesoscopic systems)
	81.07.Gf	(Nanowires)

Fund: Project supported by the Program for New Century Excellent Talents in University (Grant No. NCET-07-0278), the Hunan Provincial Natural Science Fund of China (Grant Nos. 08JJ1001 and 07JJ6009), the Major Research plan of National Natural Science Foundation of China (Grant No. 90606010) and the Program for Excellent Talents in Hunan Normal University, China(Grant No. 070623).

Cite this article:

Yuan Hua-Jun(袁华军), Chen Ya-Qi(陈亚琦), Yu Fang(余芳), Peng Yue-Hua(彭跃华), He Xiong-Wu(何熊武), Zhao Ding(赵丁), and Tang Dong-Sheng(唐东升) Hydrothermal synthesis and chromic properties of hexagonal WO₃ nanowires 2011 Chin. Phys. B 20 036103

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Hydrothermal synthesis and chromic properties of hexagonal WO3 nanowires

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Hydrothermal synthesis and chromic properties of hexagonal WO₃ nanowires