Nanoengineering of carbon nanotubes for nanotools
Nanoengineering of carbon nanotubes for nanotools
复制标题
用于纳米工具的碳纳米管纳米工程
DOI：
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
S. Akita
中科院分区：
文献类型：
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作者：
Y. Nakayama;S. Akita
我们开发了一种控制良好的方法来操纵碳纳米管。涉及到的第一个关键过程是制备纳米管阵列，称为纳米管盒。我们已经发现了纳米管的交流电泳法，通过这种方法，纳米管可以在刀口上排列。所用的纳米管是多壁的，通过在相对较高的气体温度下进行弧光放电来制备。第二个重要的过程是在扫描电子显微镜(SEM)中将纳米管从纳米管盒转移到衬底上。使用这种方法，我们已经开发出在扫描探针显微镜(SPM)中工作的纳米管尖端和纳米管镊子。纳米管探针已被应用于生物样品和工业样品的观察，以阐明其优点。纳米管镊子已经在扫描电子显微镜中演示了它们的运动，并在扫描电子显微镜中进行了携带纳米材料的操作。我们还开发了纳米管的电子烧蚀以调整其长度，并将多壁纳米管的尖端锐化为其内层，在顶端有或没有端盖。对于锐化过程，将从盒中突出的纳米管的自由端连接到金属涂层的硅尖端，并向纳米管施加电压。当在饱和电流区施加高电压时，电流在时间变化中逐渐减小，表明单个纳米管层的顺序破坏。最后在纳米管桥的中间切开纳米管，并将其尖端磨尖，使其内层具有开放的一端。在切割前向上移动墨盒使我们能够用端盖提取内层。结果表明，在逐级递减过程中，各层的最大电流与其周长有关，提取直径约5 nm的内层所受的力为~4nN。
We have developed a well controlled method for manipulating carbon nanotubes. The first crucial process involved is to prepare a nanotube array, named a nanotube cartridge. We have discovered ac electrophoresis of nanotubes by which nanotubes are aligned at the knife-edge. The nanotubes used were multiwalled and prepared by an arc discharge with a relatively high gas temperature. The second important process is to transfer a nanotube from the nanotube cartridge onto a substrate in a scanning electron microscope (SEM). Using this method, we have developed nanotube tips and nanotube tweezers that operate in a scanning probe microscope (SPM). The nanotube probes have been applied for the observation of biological samples and industrial samples to clarify their advantages. The nanotube tweezers have demonstrated their motion in an SEM and have operated to carry nanomaterials in a SPM. We have also developed the electron ablation of a nanotube to adjust its length and the sharpening of a multiwall nanotube to have its inner layer with or without an end cap at the tip. For the sharpening process, the free end of a nanotube protruding from the cartridge was attached to a metal-coated Si tip and a voltage was applied to the nanotube. When a high voltage was used in the saturation current regime, the current decreased stepwise in the temporal variation, indicating the sequential destruction of individual nanotube layers. The nanotube was finally cut at the middle of the nanotube bridge, and its tip was sharpened to have an inner layer with an opened end. Moving up the cartridge before cutting enables us to extract the inner layer with an end cap. It is evidenced that the maximum current in each layer during the stepwise decrease depends on its circumference, and the force for extracting the inner layer with ~5 nm diameter is ~4 nN.
原子力显微镜碳纳米管探针的细胞生物学应用：疟疾感染红细胞的比较研究。
DOI：
10.1093/oxfordjournals.jmicro.a023828
发表时间：
2000
期刊：
Journal of electron microscopy
影响因子：
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作者：
Nagao,E;Nishijima,H;Akita,S;Nakayama,Y;Dvorak,JA
通讯作者：
Dvorak,JA