掺杂对碳纳米管导电性影响的实验研究

发布时间：2018-04-22 07:32

本文选题：碳纳米管 + 掺杂　；参考：《华北理工大学》2017年硕士论文

【摘要】：降低碳纳米管与金属间接触电阻是碳纳米管在微纳电子领域获得广泛应用的前提。文中采用对碳纳米管掺杂过渡金属的方法来降低碳纳米管与金属间的接触电阻。不含缺陷和亲水基团的碳纳米管很难容纳外来原子,文中对在碳纳米管表面构造缺陷的高温热处理工艺进行了系统性研究。测试结果表明,高温热处理能达到活化碳纳米管的目的,在碳纳米管表面和端部产生缺陷,引入亲水基团羰基。随后将经热处理的碳纳米管浸泡在氯金酸水溶液中使其吸附氯金酸,然后氢气气氛下加热还原氯金酸为金。对获得的碳纳米管进行表征,结果表明碳纳米管被成功地掺杂了金,且金为N型掺杂剂。对活化碳纳米管的酸处理工艺也进行了研究。表征结果表明,适当的酸处理可有效活化碳纳米管,在碳纳米管表面和端部产生缺陷位并引入亲水基团羧基。对经酸处理的碳纳米管掺杂过渡金属金并进行表征,证明碳纳米管被成功地掺杂了金,且与经热处理后掺金的碳纳米管相比掺杂的金纳米粒子量更多更均匀。利用介电电泳方法将各碳纳米管样品组装到两金电极间,并使用LCR测试仪实时测量接触电阻。结果表明,掺金后碳纳米管与金电极间的接触电阻普遍降低,其中最大可减小到原来值的一半。而与热处理后掺金的碳纳米管相比,经酸处理后掺金的碳纳米管接触电阻更低。说明酸处理是更理想的活化碳纳米管的方法,对碳纳米管进行酸处理并掺金是有效的改善碳纳米管接触电阻的方法。
[Abstract]:Reducing the contact resistance between carbon nanotubes and metals is a prerequisite for the wide application of carbon nanotubes in the field of micro-nano electronics. In this paper, the method of doping transition metal into carbon nanotubes is used to reduce the contact resistance between carbon nanotubes and metals. It is very difficult for carbon nanotubes without defects and hydrophilic groups to accommodate foreign atoms. In this paper, the high temperature heat treatment of defects on the surface of carbon nanotubes is studied systematically. The test results show that the high temperature heat treatment can achieve the purpose of activating carbon nanotubes, produce defects on the surface and end of carbon nanotubes, and introduce hydrophilic carbonyl groups. The treated carbon nanotubes were then immersed in chloruronic acid aqueous solution to adsorb chlorauric acid, and then heated to reduce the chlorgold acid to gold in hydrogen atmosphere. The results showed that the carbon nanotubes were successfully doped with gold and the gold was N-type dopant. The acid treatment of activated carbon nanotubes was also studied. The characterization results show that proper acid treatment can effectively activate carbon nanotubes, produce defect sites on the surface and end of carbon nanotubes and introduce hydrophilic group carboxyl groups. It is proved that the carbon nanotubes doped with gold have been successfully doped with gold, and the amount of gold nanoparticles doped by carbon nanotubes after heat treatment is more and more uniform than that of the carbon nanotubes doped with gold after heat treatment. The carbon nanotube samples were assembled between two gold electrodes by dielectric electrophoresis, and the contact resistance was measured by LCR. The results show that the contact resistance between the carbon nanotubes and the gold electrode is generally reduced, and the maximum value can be reduced to half of the original value. Compared with the gold doped carbon nanotubes after heat treatment, the contact resistance of the gold doped carbon nanotubes after acid treatment is lower than that of the gold doped carbon nanotubes. It is concluded that acid treatment is a more ideal way to activate carbon nanotubes, and it is an effective way to improve the contact resistance of carbon nanotubes by acid treatment and gold doping.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ127.11;TB383.1

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