Performance improvement of continuous carbon nanotube fibers by acid treatment

Zhang Qiang^{1, 3}, Li Kewei¹, Fan Qingxia^{1, 3}, Xia Xiaogang^{1, 3}, Zhang Nan¹, Xiao Zhuojian^{1, 3}, Zhou Wenbin¹, Yang Feng^{1, 3}, Wang Yanchun^{1, 2, 3}, Liu Huaping^{1, 2, 3}, Zhou Weiya^{1, 2, 3, †}

(color online) Typical G^′ bands of the twisted CNT fibers (a) without acid treatment and (b) with HClSO₃ treatment for 5 hours. (c) and (d) the Raman shift of the G^′ bands for various fibers as a function of applied strain, where K_m is the slope of Raman shift to strain. Straight lines are plotted to guide the eyes.