Sublimation鈥揅ondensation of Multiscale Tellurium Structures

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• 作者：Brian J. Riley ; Bradley R. Johnson ; H. Todd Schaef ; Shanmugavelayutham K. Sundaram
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 16, 2013
• 年：2013
• 卷：117
• 期：19
• 页码：10128-10134
• 全文大小：400K
• 年卷期：v.117,no.19(May 16, 2013)
• ISSN：1932-7455

文摘

This paper presents a simple process for making tellurium (Te) nano- and microtubes of widely varying dimensions with the multiscale processing (MSP) technique. In this process, the Te metal was placed in a borosilicate glass reaction vessel and a fused quartz substrate was added. The vessel was evacuated and sealed under vacuum with a torch. Then, the vessel was heated under a temperature gradient where the portion of the tube with the substrate was under a decreasing temperature gradient. Scanning and transmission electron microscopies have shown that multifaceted crystalline tubes have been formed extending from nano- up to micrometer scale with diameters ranging from 51.2 卤 5.9 to 1042 卤 134 nm between temperatures of 157 and 224聽掳C, respectively. One-dimensional tubular features are seen at lower temperatures and three-dimensional features at the higher temperatures. These features were characterized with X-ray diffraction and found to be trigonal Te with space group P3121. Our results show that the MSP can adequately be described using a simple Arrhenius equation.