Tham khảo tài liệu 'báo cáo hóa học: " growth and structure analysis of tungsten oxide nanorods using environmental tem"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Tokunaga et al. Nanoscale Research Letters 2012 7 85 http content 7 1 85 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Growth and structure analysis of tungsten oxide nanorods using environmental TEM 1 11 1 2 Tomoharu Tokunaga Tadashi Kawamoto Kenta Tanaka Naohiro Nakamura Yasuhiko Hayashi Katsuhiro Sasaki1 Kotaro Kuroda1 and Takahisa Yamamoto1 Abstract WO3 nanorods targeted for applications in electric devices were grown from a tungsten wire heated in an oxygen atmosphere inside an environmental transmission electron microscope which allowed the growth process to be observed to reveal the growth mechanism of the WO3 nanorods. The initial growth of the nanorods did not consist of tungsten oxide but rather crystal tungsten. The formed crystal tungsten nanorods were then oxidized resulting in the formation of the tungsten oxide nanorods. Furthermore it is expected that the nanorods grew through cracks in the natural surface oxide layer on the tungsten wire. Keywords tungsten oxide nanorod environmental TEM Background Metal oxides such as ZnO In2O3 and WO3 are well known as bandgap semiconductors which led to the development of many growth methods. During the studies into these growth methods nanoscale metal oxides were discovered. These nanoscale materials have been widely studied since the electronic characteristics of nanoscale materials are different from those of bulkscale materials 1-5 . In particular metal oxides with nanorod structures were studied because they have a one-dimensional structure and are thus able to be applied for electrical components such as nanoscale wires. Tungsten oxide nanorods are one of the metal oxide semiconductors that can be easily made 6-8 . Therefore due to its semiconducting properties it is applied in electrical devices. However the growth mechanism of tungsten oxide nanorods has not yet been clarified and the growth of tungsten oxide nanorods has not been successfully .
