Effect of Titanium on the Growth and Field Emission Properties of MPECVD Grown Multiwalled Carbon Nanotubes

摘要

The growth behavior and enhanced field emission properties of multiwalled carbon nanotubes were investigated using Ti as an underlayer and over layer. Ti of 10 nm thickness was deposited underneath Fe catalyst and their interaction behavior was observed for growth of carbon nanotubes. It was observed that underlayer deposition of Ti improves the growth of CNTs by acting as a barrier. In the other set of studies, Ti film of extremely small thickness (15 A) was post deposited over CNTs to investigate their field emission behavior. The turn on and threshold field values of Ti modified CNTs were found to be low ～0.8 V/μm and 2.65 V/μm, respectively, as compared to pure CNTs. HRTEM studies confirmed that Ti nanoclusters on post deposition adsorbs on the edges and walls of CNTs. This improved adhesion and bonding with CNTs is due to the unfilled d-shell of Ti, resulting in the modification of CNTs structure.