Preparation of CNT–Co@TiB2 by catalytic CVD: Effects of synthesis temperature and growth time

Abstract

Owing to its excellent properties, titanium boride (TiB2) has drawn considerable attention. This study focuses on in-situ synthesis of carbon nanotubes (CNTs) on the surfaces of TiB2 particles by using Co as a catalyst in catalytic chemical vapor deposition to improve the toughness of TiB2 through the toughening effect of CNTs. Analyses of crystal structure, phase and microstructure confirm the successful grafting of CNTs on TiB2 matrix. Carbon yield is also calculated to estimate the effects of carbon deposition. Raman spectroscopy indicates that the CNTs grafted on TiB2 at 850 °C for 150 min exhibit low ID/IG, suggesting satisfactory quantity and quality of CNTs. An appropriate increase in synthesis temperature can promote the rapid growth of CNTs at the beginning, extending the growth time of CNTs. Meanwhile, sufficient growth time would allow the process of carbon precursor conversion to CNTs, enhancing the purity and graphitization of CNTs.