Improvement on electrical contact characteristics of Au-doped carbon nanotubes by acid oxidation

被引：0
作者：
Zhang Y.-D. [1 ]
Chang C.-R. [2 ]
Zhang Z.-M. [3 ]
Zhang H.-Q. [1 ]
Sun H.-C. [1 ]
An L.-B. [1 ]
机构：
[1] College of Mechanical Engineering, North China University of Science and Technology, Tangshan
[2] College of Science, North China University of Science and Technology, Tangshan
[3] College of Materials Engineering, North China University of Science and Technology, Tangshan
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2018年 / 52卷 / 08期
关键词：
Acid oxidation; Carbon nanotubes; Contact resistance; Doping; Gold nanoparticles;
D O I：
10.3785/j.issn.1008-973X.2018.08.023
中图分类号：
学科分类号：
摘要：
Defects and some oxygen-containing functional groups were obtained on the surface of carbon nanotubes by means of reflux treatment of 40% nitric acid, and then the treated nanotubes adsorbed the molecules or the corresponding ions by means of ultrasonic vibration in the auric chloride acid solution. The gold in the oxidation state was converted to the 0 valence state through hydrogen thermal reduction. Both of scanning electron microscopy images and infrared absorption spectroscopy show that the defects, some hydroxyl groups, carboxyl and other oxygen-containing functional groups are formed on the walls of the tubes by the acid treatment. Morphological characterization images show nanoparticles are successfully doped on the nanotubes' walls and ends. X-ray photoelectron spectroscopy shows that the nanoparticle is composed of 0 valence gold. After doping, the G-band wavenumber increases in Raman spectra, which indicates the doping method is P-type, and electrons transfer from adjacent carbon atoms to dopants, increasing the hole concentration in carbon nanotubes and thereby lowering the contact resistance. Both intrinsic carbon nanotubes and treated ones are assembled onto the gold electrodes by dielectrophoresis. Results show that the contact resistance has been considerably improved after doping, with the average resistance decrease up to 69.20%. © 2018, Zhejiang University Press. All right reserved.
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页码：1624 / 1630
页数：6
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