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Nanocrystalline Diamond on a-SiO2 Fiber: a New Class of Hybrid Material

Singh, M.K.S. ; Titus, E.T. ; Mendes, J. C. ; Cabral, G.C. ; Shokufar, T.S. ; Neto, V. Neto

Diamond and Related Materials Vol. 17, Nº 7-10, pp. 1106 - 1109, July, 2008.

ISSN (print): 0925-9635
ISSN (online):

Journal Impact Factor: 1,913 (in 2011)

Digital Object Identifier: 10.1016/j.diamond.2008.02.023

Abstract
We report a template technique for the fabrication of high density nanocrystalline diamond (NCD)-coated silica (a-SiO2) nanofibers with diameters of 1–5 μm. This method includes the synthesis of templates (a-SiO2 nanofibers) by conventional Vapor–Liquid–Solid method and the conformal coating of the nanofibers with nanodiamond by Microwave Plasma Chemical Vapor Deposition technique in hydrogen-deficient conditions. A detailed micro-structural analysis was performed to probe the interaction of the NCD grains with a-SiO2 nanofibers. The specimen for Transmission Electron Microscopy was prepared using Focused Ion Beam lift-out method. Room temperature micro-Raman was performed to study the crystalline quality of the NCD-coated silica nanofibers. Field electron emission of as-synthesized NCD-coated silica nanofibers was observed with a threshold field of ~ 3 V/µm.