Basic research on development of hybrid electronic device by supporting of nanoscopic plasma process

我们采用等离子体离子辐照法制备了碱金属和富勒烯包覆的单壁碳纳米管（Cs@SWNTs和C_<60>@SWNTs），并采用场效应晶体管（FET）结构研究了它们的电子输运性质。尽管已经证实原始单壁碳纳米管和C_@SWNT5<60>显示出p型传输性质，但Cs@SWNT5明显地显示出n型传输性质，这可以从电子从包封的Cs原子向周围的单壁碳纳米管转移的角度来解释。这些结果表明，等离子体离子辐照单壁碳纳米管可以将碳原子或分子包裹在碳纳米管内部，从而实现对碳纳米管电子结构的控制<60>。将聚乙二醇（PEG）接枝单壁碳纳米管（PEG-SWNTs）与导电聚合物聚苯胺复合后，用旋涂机将其涂敷在带有4个梳状电极的玻璃板上。PEG-SWNTs是通过热处理包含Azo-PEG（大分子偶氮引发剂）的甲苯溶液来合成的。根据测量结果，发现丙酮和乙醇的阻抗随时间的变化明显不同。特别地，观察到乙酸的阻抗降低，其来源于羧基自由基，并且显示出明显不同于其他材料的反应。因此，该传感器提供了特定气体检测的功能。

We have produced alkali-metal-and fullerene-encapsulated single-walled carbon nanotubes (Cs@SWNTs and C_<60>@SWNTs) by plasma ion irradiation, and investigated their electronic transport properties in comparison with those of pristine SWNTs by adopting field effect transistor (FET) configurations. Although it is confirmed that pristine SWNTs and C_<60>@SWNT5 show a p-type transport property, Cs@SWNT5 clearly exhibit an n-type transport property, which is explained in terms of electron transfer from encapsulated Cs atoms toward the surrounding SWNTs. These results signify that the encapsulation of atoms or molecules inside single-walled carbon nanotubes by plasma ion irradiation has potential for controlling the electronic structure of SWNTs.The basic characteristics of gas sensor based on C_<60> (or SWNTs) and polymer composite material were observed. The composite material of polyethylene glycol (PEG)-grafted SWNTs (PEG-SWNTs) and conductive polymer: polyaniline is coated on to a glass plate with 4 comb-like electrodes by spin coater. PEG-SWNTs are synthesized by heat-treatment of toluene solution including Azo-PEG (macro Azo initiators). According to the measurement, it turned out that the change at time of impedance for the acetone and the ethanol was different clearly. Especially, acetic acid is observed the decrease in the impedance which originates in carboxyl radical, and shows a reaction which is obviously different from other materials. Therefore, it turned out this sensor to provide the function for the specific gas detection.