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Effect of substrate heating and microwave attenuation on the catalyst free growth and field emission of carbon nanotubes

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Title Effect of substrate heating and microwave attenuation on the catalyst free growth and field emission of carbon nanotubes
 
Creator KAR, R
SARKAR, SG
BASAK, CB
PATSHA, A
DHARA, S
GHOSH, C
RAMACHANDRAN, D
CHAND, N
CHOPADE, SS
PATIL, DS
 
Subject RAMAN-SPECTRA
ELECTRON-EMISSION
ARRAYS
ALLOY
FILMS
DEPOSITION
DIAMOND
VAPOR
 
Description Carbon nanotubes (CNTs) have been directly grown on Inconel 600 substrates by microwave plasma enhanced chemical vapor deposition without using any external catalyst. Grown CNTs were characterized by field emission scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction, Raman spectroscopy and field emission measurements. Characterization results show that field emission current density increases from 200 mu A/cm(2) at similar to 5.5 V/mu m to 14.5 mA/cm(2) at similar to 1.6V/mu A when substrate is heat-treated and incident microwave is attenuated before reaching it. Detailed characterization reveals that heat-treatment results in migration of Cr and Fe oxides towards the top surface which completely changes substrate morphology also. Microwave attenuation reduces reflection of microwaves from the substrate and increases residence time of the precursor over the substrate promoting high density growth of CNTs. The combination of these two process parameters resulted in growth of long, dense CNTs with bamboo-like defects that contributes to enhanced current density at lower applied field. (C) 2015 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2016-01-14T13:11:58Z
2016-01-14T13:11:58Z
2015
 
Type Article
 
Identifier CARBON, 94,256-265
0008-6223
1873-3891
http://dx.doi.org/10.1016/j.carbon.2015.07.002
http://dspace.library.iitb.ac.in/jspui/handle/100/17583
 
Language en