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

Cherng Yuh Su, Hsuan Ching Lin, Tsung Kun Yang, Chung Kwei Lin

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 WO 2.8 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.

Original languageEnglish
Pages (from-to)1755-1763
Number of pages9
JournalJournal of Nanoparticle Research
Volume12
Issue number5
DOIs
Publication statusPublished - Jun 2010
Externally publishedYes

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Keywords

  • Nanomanufacturing
  • Nanomaterials
  • Nanorods
  • Optical properties
  • Plasma arc gas condensation technique
  • Tungsten oxide

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Modelling and Simulation
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering

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