Performance improvement of continuous carbon nanotube fibers by acid treatment

doi:10.1088/1674-1056/26/2/028802

Abstract

Continuous CNT fibers have been directly fabricated in a speed of 50 m/h-400 m/h, based on an improved chemical vapor deposition method. As-prepared fibers are further post-treated by acid. According to the SEM images and Raman spectra, the acid treatment results in the compaction and surface modification of the CNTs in fibers, which are beneficial for the electron and load transfer. Compared to the HNO₃ treatment, HClSO₃ or H₂SO₄ treatment is more effective for the improvement of the fibers' properties. After HClSO₃ treatment for 2 h, the fibers' strength and electrical conductivity reach up to ~2 GPa and ~4.3 MS/m, which are promoted by ~200% and almost one order of magnitude than those without acid treatment, respectively. The load-bearing status of the CNT fibers are analyzed based on the downshifts of the G' band and the strain transfer factor of the fibers under tension. The results reveal that acid treatment could greatly enhance the load transfer and inter-bundle strength. With the HClSO₃ treatment, the strain transfer factor is enhanced from ~3.9% to ~53.6%.

Keywords: carbon nanotube fiber electrical conductivity mechanical property performance improvement

Received: 08 November 2016
Revised: 16 November 2016
Accepted manuscript online:

PACS:	88.30.rh	(Carbon nanotubes)
	81.07.-b	(Nanoscale materials and structures: fabrication and characterization)
	78.30.-j	(Infrared and Raman spectra)
	61.48.De	(Structure of carbon nanotubes, boron nanotubes, and other related systems)

Fund:

Project supported by the National Basic Research Program of China (Grant No. 2012CB932302), the National Natural Science Foundation of China (Grant Nos. 11634014, 51172271, 51372269, and 51472264), and the "Strategic Priority Research Program" of the Chinese Academy of Sciences (Grant No. XDA09040202).

Corresponding Authors: Weiya Zhou
E-mail: wyzhou@iphy.ac.cn

Cite this article:

Qiang Zhang(张强), Kewei Li(李克伟), Qingxia Fan(范庆霞), Xiaogang Xia(夏晓刚), Nan Zhang(张楠), Zhuojian Xiao(肖卓建), Wenbin Zhou(周文斌), Feng Yang(杨丰), Yanchun Wang(王艳春), Huaping Liu(刘华平), Weiya Zhou(周维亚) Performance improvement of continuous carbon nanotube fibers by acid treatment 2017 Chin. Phys. B 26 028802

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