以多孔氧化铝膜为支撑模板制备热电材料gamma-Na0. 7 CoO 2纳米管
Fabrication of nanotubules of thermoelectric gamma-Na0.7CoO2 using porous aluminum oxide membrane as supporting template
摘要：
我们报道了利用两种不同的溶胶-凝胶方法，以多孔阳极氧化铝膜为模板，成功地合成了热电材料γ-NaxCoO 2纳米管。使用基于尿素的路线的γ-NaxCoO 2纳米管可以在650 ℃下以1 ℃/min的加热速率并保持4 h来实现。使用柠檬酸为基础的路线的γ-NaxCoO 2纳米管可以实现在500 ℃下使用快速加热程序，并保持30分钟。使用各种技术，包括XRD，SEM和TEM的产品进行了研究。沿着纳米管上[001]区轴方向的电子衍射图案表明，所有的衍射点可以使用具有a = b = 0.56 nm的六方晶胞来索引，其可以被认为是在ab平面内具有晶胞加倍的超结构。
英文摘要：
We report the successful synthesis of nanotubules of thermoelectric materials gamma-NaxCoO2 using two different sol-gel routes aided by porous anodized aluminium oxide (AAO) membrane as supporting templates. The gamma-NaxCoO2 nanotubule using urea-based route can be achieved at 650 degree C at a heating rate of 1 degree C/min and held for 4h. The gamma-NaxCoO2 nanotubule using citric acid-based route can be achieved at 500 degree 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 [001] 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.
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