Morphology of C60 nanotubes fabricated by the liquid-liquid interfacial precipitation method
Morphology of C60 nanotubes fabricated by the liquid-liquid interfacial precipitation method
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DOI：
10.1016/j.stam.2005.02.006
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发表时间：
2005-04-01
影响因子：
5.5
通讯作者：
Suga, T
中科院分区：
文献类型：
--
作者：
Minato, J;Miyazawa, K;Suga, T
单晶 C-60 富勒烯纳米晶须是通过将异丙醇轻轻添加到富勒烯饱和溶液中形成的。该方法称为液-液界面沉淀法。本研究利用透射电子显微镜对具有中空结构的C-60纳米晶须进行了观察，即以吡啶为溶剂改进液-液界面沉淀法制备的C-60富勒烯纳米管。将异丙醇加入到玻璃瓶中的C-60溶液中，超声分散1分钟，然后将瓶子保持在10℃。24小时内，沉淀出长度大于几毫米、直径从亚微米到1μm的纤维状固体。为了进行透射电子显微镜研究，通过超声波分散将样品粉碎。透射电镜下，直径大于200 nm的晶须多呈管状形貌，直径小于200 nm的晶须几乎观察不到管状形貌； C-60富勒烯纳米管和富勒烯C-60纳米晶须均处于结晶状态。由于有时在 C-60 富勒烯纳米晶须的末端观察到部分管状结构，因此表明管状形态形成的机制是晶体生长后的溶解过程。当粉碎后将样品保留在玻璃瓶中几个小时时，对于直径相对较小的纳米管，观察到纳米管在末端闭合。对于直径相对较大的纳米管，观察到管壁边缘呈锯齿形变薄。因此预计粉碎后的C-60纳米管末端会发生后续生长或溶解，这可能是控制管形状的有效方法。这里介绍的 C-60 纳米管可用作吸附剂、催化剂和膜。 (c) 2005 Elsevier Ltd. 保留所有权利。
Single crystalline C-60 fullerene nanowhiskers are formed by adding isopropyl alcohol gently to fullerene saturated solutions. The method is called the liquid-liquid interfacial precipitation method. In the present study, observation using transmission electron microscope was made for C-60 nanowhiskers with hollow structure, i.e. C-60 fullerene nanotubes fabricated by the modification of liquid-liquid interfacial precipitation method using pyridine as solvent. After adding isopropyl alcohol to the C-60 Solution in the glass bottles, ultrasonic dispersion was applied for 1 min and then the bottles were kept at 10 degrees C. Within 24 h, fibrous solids with the length larger than several millimeters and the diameters ranging from submicrons to 1 mu m were precipitated. For the transmission electron microscope study, the samples were pulverized by the ultrasonic dispersion. Under the transmission electron microscope, tubular morphology was usually observed for the whiskers with the diameters larger than 200 nm and hardly observed for those with the diameters smaller than 200 nm; both the C-60 fullerene nanotubes and the fullerene C-60 nanowhiskers were in crystalline state. Since partly tubular structures were sometimes observed at the end of the C-60 fullerene nanowhiskers, the mechanism for the formation of tubular morphology is suggested to be a dissolution process after the crystal growth. When the samples were kept in the glass bottles for several hours after the pulverization, closing of nanotubes at the ends was observed for relatively smaller nanotubes in diameter. For relatively larger nanotubes in diameter, zigzag thinning of tube wall edges was observed. It is thus expected that subsequent growth or dissolution occurred at the end of the pulverized C-60 nanotubes, which may be an effective way to control the shape of tubes. The C-60 nanotubes presented here will be useful as adsorbents, catalysts, and membranes. (c) 2005 Elsevier Ltd. All rights reserved.