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Control of nano-carbon synthesized in liquid phase under high magnetic field

高磁场下液相合成纳米碳的控制

基本信息

批准号：
16510089
负责人：
YOKOMICHI Haruo
金额：
$ 2.11万
依托单位：
Toyama Prefectural University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Carbon nanotubes have been commonly synthesized using a wide variety of chemical vapor deposition (CVD) methods, arc discharge and laser ablation techniques. These synthesis methods require a high synthesis temperature, at least 500℃. A low-temperature synthesis is important for an application of nanotubes and nanowires to practical devices. Since we have reported the room temperature nano-carbon synthesis by electrochemical techniques, high magnetic fields up to 12 Tesla are applied to electrochemical techniques for carbon nanotube synthesis. The deposits were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). An increase in the long carbon nanowires due to magnetic field was observed by TEM. In addition, high magnetic fields up to 12 Tesla are applied to thermal CVD for carbon nanotube synthesis. An increase in the onion-like nano-carbons and due to magnetic field was observed by TEM. Beside these synthesis methods, we have discovered another room temperature synthesis method of carbon nanotubes and carbon nanowires. The new room temperature synthesis has been achieved by a supersonic irradiation into a liquid phase of organic solution with a metal catalyst and metal Na. The temperature increase during the deposition is negligible, because of by a few degrees at most. This low temperature synthesis method has a great advantage to develop carbon-based new materials. In addition, the apparatus used in the present study is simple and is not expensive. Therefore, this technique will make it possible to develop other nanosized new materials.

碳纳米管通常使用各种化学气相沉积（CVD）方法、电弧放电和激光烧蚀技术来合成。这些合成方法需要较高的合成温度，至少500℃。低温合成对于将纳米管和纳米线应用于实际器件是重要的。由于我们已经报道了通过电化学技术的室温纳米碳合成，高达12特斯拉的高磁场被施加到用于碳纳米管合成的电化学技术。用扫描电镜（SEM）、透射电镜（TEM）和能谱仪（EDS）对镀层进行了表征。通过TEM观察到由于磁场的作用，长碳纳米线的增加。此外，高达12特斯拉的高磁场被应用于碳纳米管合成的热CVD。通过TEM观察到洋葱状纳米碳的增加和由于磁场。除了这些合成方法之外，我们还发现了另一种室温合成碳纳米管和碳纳米线的方法。采用超声波辐射的方法，在金属钠和金属催化剂的作用下，实现了一种新的室温合成方法。沉积过程中的温度升高可以忽略不计，因为最多只有几度。这种低温合成方法对开发碳基新材料具有很大的优势。此外，本研究中使用的装置简单且不昂贵。因此，这项技术将使开发其他纳米新材料成为可能。