| Summary: | 碩士 === 國立中央大學 === 物理研究所 === 92 === After being found in 1991, the carbon nanotube becomes a rising nanomaterial because of its many special properties, in particular, the dimension of its structure and the conductivity of electrons. Other properties, such as the high tension, heat conductivity, and electric current tolerance broaden the applications of the carbon nanotube. However, the naronic structure limits the advance of the applications of the carbonate nanotube, since so far the atomic force microscope is the only tool to control the carbon nanotube. Therefore, before talking about the applications, to overcome the difficulties in controlling the carbon nanotube is a worthwhile subject.
In this thesis, we will use the electrophoresis, which is usually used to separate proteins in biological experiments, to bolt the carbon nanotubes of different length. By changing the bias (with alternative or direct current) applied to the carbon nanotubes and its order, we observe nanotubes of different length and find that the longer nanotubes have higher velocity than those of short length.
We impose the character of nanotubes' movement to higher electric field to connect the electrodes with the nanotubes. Then we change the number of tubes between electrodes by tuning the concentration of carbon nanotube in the electrophoresis experiments. Subsequnetly, through measuring the electric signal between nanotubes, the system can be used to design electronic devices. In our work, the electric signal flowed through the nanotubes is detected successfully and the preparing work of producing the gaseous sensor made of nanotubes is done.
In the aspect of producing the field effect transistor made of carbon nanotubes, we observe that the change of current between the source and the drain depends on the gate voltage. This implies the fundamental operation of the field effect transistor.
The above method using electrophoresis shows sufficient result in controlling the carbon nanotube and the related applications. The cost of the experimental set of electrophoresis is much lower than other manipulative tools, consequently, electrophoresis will be an efficient and convenient technique to control nanomaterials.
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