Mohanty Paritosh, Kang Taejoon, Kim Bongsoo, Park Jeunghee
Department of Chemistry, KAIST, Daejeon 305-701, Korea.
J Phys Chem B. 2006 Jan 19;110(2):791-5. doi: 10.1021/jp0551364.
Single crystalline tellurium (Te) nanotubes with triangular cross sections were successfully synthesized for the first time by a simple approach of vaporizing tellurium metal and condensing the vapor in an inert atmosphere onto a suitable substrate. Tellurium gas was evaporated by heating at 350 degrees C and was condensed on the Si (100) substrate at 150-200 degrees C, in the downstream of argon (Ar) gas at a flow rate of 25 sccm for 10 min. This led to the production of nanotubes of triangular cross section along with some hexagonal ones. The formation of the nanotubes was highly dependent upon the structure of the substrate surface, Ar gas flow rate, and the deposition temperature. When the substrate is Si (111) or sapphire (0001) or when the argon flow rate is increased to 500 sccm, nanowires and nanorods were exclusively formed. Irrespective of the morphologies, all the observed Te nanostructures grew in a regular [0001] direction. The facile approach to nanotubes with a triangular cross section may facilitate some new applications as well as stimulate theoretical studies pertaining to the stability of this high-energy configuration.
首次通过一种简单的方法成功合成了具有三角形横截面的单晶碲（Te）纳米管，该方法是在惰性气氛中将碲金属汽化并将蒸汽冷凝到合适的衬底上。碲气在350摄氏度下加热蒸发，并在150 - 200摄氏度下在硅（100）衬底上冷凝，位于氩气（Ar）气流下游，流速为25标准立方厘米每分钟，持续10分钟。这导致了三角形横截面纳米管以及一些六边形纳米管的产生。纳米管的形成高度依赖于衬底表面结构、氩气流速和沉积温度。当衬底是硅（111）或蓝宝石（0001）时，或者当氩气流速增加到500标准立方厘米每分钟时，仅形成纳米线和纳米棒。无论形态如何，所有观察到的碲纳米结构都沿规则的[0001]方向生长。这种制备具有三角形横截面纳米管的简便方法可能会促进一些新的应用，并激发有关这种高能构型稳定性的理论研究。
