Wen Xiaogang, Wang Suhua, Ding Yong, Wang Zhong Lin, Yang Shihe
Department of Chemistry, Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
J Phys Chem B. 2005 Jan 13;109(1):215-20. doi: 10.1021/jp0461448.
Vertically aligned iron oxide nanobelt and nanowire arrays have been synthesized on a large-area surface by direct thermal oxidation of iron substrates under the flow of O(2). The effects of reactive gas pressure, composition, and temperature have been systematically studied. It was found that nanobelts (width, tens of nanometers; thickness, a few nanometers) are produced in the low-temperature region (approximately 700 degrees C) whereas cylindrical nanowires tens of nanometers thick are formed at relatively higher temperatures (approximately 800 degrees C). Both nanobelts and nanowires are mostly bicrystallites with a length of tens of micrometers which grow uniquely along the [110] direction. The growth habits of the nanobelts and nanowires in the two temperature regions indicate the role of growth rate anisotropy and surface energy in dictating the ultimate nanomorphologies.
通过在氧气流中对铁基板进行直接热氧化，已在大面积表面上合成了垂直排列的氧化铁纳米带和纳米线阵列。系统研究了反应气体压力、成分和温度的影响。结果发现，在低温区域（约700摄氏度）产生纳米带（宽度为几十纳米；厚度为几纳米），而在相对较高温度（约800摄氏度）下形成几十纳米厚的圆柱形纳米线。纳米带和纳米线大多是长度为几十微米的双晶，它们沿[110]方向独特生长。两个温度区域中纳米带和纳米线的生长习性表明了生长速率各向异性和表面能在决定最终纳米形态方面的作用。
