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Structure and optical properties of tungsten oxide nanomaterials prepared by a modified plasma arc gas condensation technique

Su, Cherng-Yuh and Lin, Hsuan-Ching and Yang, Tsung-Kun and Lin, Chung-Kwei (2010) Structure and optical properties of tungsten oxide nanomaterials prepared by a modified plasma arc gas condensation technique. Journal of Nanoparticle Research, 12 (5). pp. 1755-1763.

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Abstract

With the use of a modified plasma arc gas condensation technique and control of the processing parameters, namely, plasma current and chamber pressure, we synthesized tungsten oxide nanomaterials with aspect ratios ranging from 1.1 (for equiaxed particles with the length and width of 48 nm and 44 nm, respectively) to 12.7 (for rods with the length and width of 266 nm and 21 nm, respectively). The plasma current and chamber pressure, respectively, ranged from 70 to 90 A and from 200 to 600 Torr. We then characterized the tungsten oxide nanomaterials by means of X-ray diffraction, high-resolution transmission electron microscope, UV–visible spectroscope, and photoluminescence (PL) spectroscope. Experimental results show that equiaxed tungsten oxide nanoparticles were produced at a relatively low plasma current of 70 A, whereas nanorods were produced when plasma currents or chamber pressures were increased. All of the as-prepared tungsten oxide nanomaterials exhibited a WO2.8 phase. Compared to the nanoparticles, the nanorods exhibited unique properties, such as a redshift in the UV–visible spectrum, a blue emission in PL spectrum, and a good performance in field emission. With respect to the field emission, the turn-on voltage for WO2.8 nanorods was found to be as low as 1.7 V/μm.

Item Type:Article
Uncontrolled Keywords:Plasma arc gas condensation technique - Tungsten oxide - Nanomaterials - Nanorods - Optical properties - Nanomanufacturing
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
ID Code:9259
Deposited By:SPI
Deposited On:08 Jun 2010 17:53
Last Modified:08 Jun 2010 17:53

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