标题：Enhanced mechanical strength and electrical conductivity of carbon-nanotube/TiC hybridfi bers
作者：Qingh ua Yi,Xiao Dai,Jie Zhao,Yinghui Sun,Yanhui Lou,Xiao dong Su,Qingwe n Li,Bao quan Sun,Hong he Zheng ,Mingrong Shen,Qing hua Wang and Guifu Zou
摘要：
We report the synthesis of carbon nanotube/TiC hybridfibers using a polymer-assisted chemical solution
approach. Ti metal ions are bound to aqueous polyethyleneimine (PEI) to form precursor solution.
Amphiphilic PEI with Ti easily permeates the CNT fi bers. Upon annealing in a controlled atmosphere, a
homogeneous TiC network is formed in the CNT fi bers. The obtained CNT/TiC hybrid fi bers show
prominent enhancement in mechanical strength and electrical conductivity. The tensile strength and
conductivity of CNT/TiC fibers can be improved to 0.67 GPa and 1650 S cm 1at room temperature,
respectively. More importantly, a tensile modulus as high as 420 GPa has been achieved for the CNT/TiC
fibers. Analysis shows that the cross-linking matrix of hard TiC plays a significant role in the
improvement of mechanical strength. Furthermore, the electrons are transported in the CNT/TiC fiber
by a three dimensional hopping mechanism.
Nanoscale DOI: 10.1039/ c3nr01857a