Microstructure and electron field emission study of diamond nanorod decorated a-SiO2 nanowires by microwave Ar-CH4/H-2 plasma chemical vapor deposition with addition of N-2


In our recent paper [M. K. Singh et al., Chem. Mater. 20 (2008) 1725], we reported the fabrication of Nanocrystalline diamond (NCD) fibers by template (a-SiO2 nanowires) technique. Our present work demonstrate that the addition of nitrogen of 20% by volume in the reaction gas during synthesis induce the formation of feather-like morphology of NCD on a-SiO2 nanowires. The feather-like morphology consists oriented diamond nanorods surrounded by an sp(2)-bonded carbon sheath. These have been characterized by Scanning Electron Microscopy, Transmission Electron Microscopy (high-resolution mode) and Micro-Raman spectroscopy. Electron field emission (EFE) of as-synthesized NCD fibers (with 20% N-2 addition) was observed with a threshold field of 3.5 V/mu m which is quite less in comparison to previous grown NCD fibers and the current density at 10 V/mu m increases around 20 times with 20% nitrogen doping in the gas source during synthesis. This may be because each diamond nanorod is enveloped in a sheath of sp(2)-bonded nanocarbons which provides a conducting path for electron emission. (C) 2009 Elsevier B.V. All rights reserved.




Materials Science


Singh, MK; Titus, E; Willinger, MG; Madaleno, JC; Gracioa, J


Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".