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题名: Fabrication of Nanotubules of Thermoelectric γ-Na0.7CoO2 Using Porous Aluminum Oxide Membrane as Supporting Template
作者: Liu, Chia-Jyi;Chen, Shu-Yo;Shih, Long-Jiann;Huang, Hsueh-Jung
贡献者: 物理學系
关键词: Nanomaterial;Thermoelectric oxide;AAO template aided sol-gel synthesis
日期: 2010-02
上传时间: 2012-09-10T06:16:10Z
出版者: Elsevier
摘要: We report the successful synthesis of nanotubules of thermoelectric materials γ-NaxCoO2 using two different sol–gel routes aided by porous anodized aluminium oxide (AAO) membrane as supporting templates. The γ-NaxCoO2 nanotubule using urea-based route can be achieved at 650 °C at a heating rate of 1 °C min−1 and held for 4 h. The γ-NaxCoO2 nanotubule using citric acid-based route can be achieved at 500 °C using a rapid-heat-up procedure and held for 30 min. The products were investigated using various techniques including XRD, SEM and TEM. Electron diffraction pattern taken along [0 0 1] zone axis direction on the nanotubule shows that all the diffraction spots can be indexed using a hexagonal unit cell with a = b = 0.56 nm, which can be considered as a superstructure with cell doubling within the ab plane.
關聯: Materials Chemistry and Physics, 119(3): 424-427
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