Abstract
In this study, the C2H2 was used as carbon source in the chemical vapor deposition to grow carbon nanotubes at 600oC by controlling both gas flow rate of H2 and Ar. Through changing the gas flow rate, we successfully grew multi-wall carbon nanotubes (MWCNTs). To understand the doping effects on the functionalized MWCNTs, different organic hydrazines with functional groups such as phenyl,–NO2 or –NH2 were used to chemically treat MWCNTs. To characterize the functionalization of MWCNTs, we employed the Field Emission Scanning Microscope for the morphology, and Four-Point Probe, Raman Spectroscopy, Ultra-violet photoelectron Spectroscopy and X-ray Photoemission Spectroscopy for the conducting characteristics, structure and chemical bonding after chemical modification. We found the MWCNTs acquired some nitrogenous bonding structures after the treatment of UV-irradiated 2-Nitrophenylhydrazine solution on the sample. The electric conductivity also showed improvement via the treatment of UV-irradiated 2-Nitrophenylhydrazine, which displayed addition reaction on the -bonds of MWCNTs. We therefore proposed a mechanism to illustrate the functionalization on MWCNTs.