沉积法掺金改善碳纳米管电接触特性

doi:10.19665/j.issn1001-2400.2019.01.024

摘要/Abstract

摘要：

研究了沉积法在碳纳米管中掺杂金属金对碳纳米管与金属电极间的电接触特性的影响。首先,采用酸回流方式在碳纳米管表面构造缺陷及亲水官能团并配制碳纳米管分散液;然后,采用柠檬酸钠和氯金酸配制金溶胶溶液,再将配制好的碳纳米管分散液滴入金溶胶溶液中,经震荡沉积得到掺杂金纳米粒子的碳纳米管样品。扫描电子显微图片及红外吸收光谱表明,酸回流成功地在碳纳米管管壁及端部构造了一些缺陷及亲水官能团。形貌表征及X射线光电子谱表明,在碳纳米管表面及端部成功地掺杂了金纳米粒子。掺金后碳纳米管拉曼光谱的G带波数增大,表明该掺杂类型为p型。最后,采用介电电泳法将原样与掺金碳纳米管分别组装到金电极之间,并实时测量接触电阻。结果表明,沉积法掺金可降低碳纳米管与金电极间的接触电阻,其阻值平均降幅高达71.49%。

关键词: 碳纳米管, 无电沉积, 掺杂, 金纳米粒子, 接触电阻

Abstract:

The effect of doping metal gold into carbon nanotubes (CNTs) by the deposition method on the electrical contact characteristics between CNTs and metal electrodes is studied. First, defects and oxygen-containing functional groups are made by acid reflux on the surface of CNTs, and the CNT dispersion is prepared. Then, the gold sol solution is prepared by mixing the sodium citrate and chloroauric acid, and the prepared CNT dispersion is dropped into the gold sol solution to produce the samples of gold nanoparticle-doped CNTs by oscillating deposition. Scanning electron micrographs and infrared absorption spectra reveal that the acid treatment is successful in constructing some defects and hydrophilic functional groups on the walls and ends of CNTs. The morphological characterization and X-ray photoelectron spectroscopy demonstrate that gold nanoparticles are successfully doped on the surface and ends of CNTs. The increase in the G-band wavenumber of the Raman spectrum of the gold-doped CNTs indicates that the doping type is the p-type. Finally, dielectrophoresis is used to assemble the original and gold-doped CNTs between the gold electrodes, and the contact resistance is measured in real time. The results show that Au doping by the deposition method can reduce the contact resistance between CNTs and gold electrodes, and that the average resistance decrease is 71.49%.

Key words: carbon nanotubes, electroless deposition, doping, gold nanoparticles, contact resistance

中图分类号:

TN305.3

孙蒙蒙,常春蕊,张志明,张亚东,安立宝. 沉积法掺金改善碳纳米管电接触特性[J]. 西安电子科技大学学报, 2019, 46(1): 151-157.

SUN Mengmeng,CHANG Chunrui,ZHANG Zhiming,ZHANG Yadong,AN Libao. Study of improving the electrical contact performance of carbon nanotubes by doping Au using the deposition method[J]. Journal of Xidian University, 2019, 46(1): 151-157.

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