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|Author(s):||P. M. Parthangal; Richard E. Cavicchi; Christopher B. Montgomery; Shirley Turner; Michael R. Zachariah;|
|Title:||Restructuring of Tungsten Thin Films Into Nanowires and Hollow Square Cross-Section Microducts|
|Published:||November 01, 2005|
|Abstract:||We report on the growth of nanowires and unusual hollow microducts of tungsten by thermal treatment of tungsten films in a RF H2/Ar plasma at temperatures between 550-620 C. Nanowires with diameters of 10-30 nm and lengths between 50-300 nm were formed directly from the tungsten film, while under certain specific operating conditions hollow microducts having edge lengths ~ 0.5 m and lengths between 10-200 m were observed. Presence of a reducing gas like H2 was crucial in growing these nanostructures. Preferential restructuring of the film surface into nanowires or microducts appears to be significantly influenced by the rate of mass-transfer of H2 to the surface. We also give an example of the gas sensing capabilities of tungsten nanowires.|
|Citation:||Journal of Materials Research|
|Pages:||pp. 2889 - 2894|
|Keywords:||hollow square microducts,nanowires,tungsten|
|DOI:||http://dx.doi.org/10.1557/Jmr.2005.0373 (Note: May link to a non-U.S. Government webpage)|
|PDF version:||Click here to retrieve PDF version of paper (3MB)|