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Title: Electron field emitters based on multiwalled carbon nanotubes decorated with nanoscale metal clusters
Authors: Rakhi, R.B.
Reddy, A.L.M.
Shaijumon, M.M.
Sethupathi, K.
Ramaprabhu, S.
Keywords: Acetylene; Chemical vapor deposition; Field emission; Heat treatment; Nanocrystalline materials; Rare earth alloys; Electron field emitters; Flexible graphitized carbon cloth; Fowler-Nordheim theory; Hydrogen decrepitation technique; Nanocrystalline metal cluster; Nanoscale metal clusters; Multiwalled carbon nanotubes (MWCN); acetylene; acid; alloy; hydrogen; lanthanide; multi walled nanotube; nanocrystal; palladium; platinum; ruthenium; catalysis; catalyst; decomposition; electric field; field emission; priority journal; purification; reduction; sample; scanning electron microscopy; synthesis; transmission electron microscopy; vapor; X ray analysis; X ray diffraction
Issue Date: 2008
Citation: Journal of Nanoparticle Research, 10(1), 179-189
Abstract: The present work describes the field emission characteristics of nanocrystalline metal clusters decorated multi walled carbon nanotubes (MWNT) field emitters fabricated over flexible graphitized carbon cloth. MWNT have been synthesized by catalytic chemical vapour decomposition (CCVD) of acetylene over Rare Earth (RE) based AB2 (DyNi2) alloy hydride catalyst. Fine powders of RE based AB2 alloy hydride catalysts have been prepared by hydrogen decrepitation technique. The as-grown carbon nanotubes (CNTs) are purified by acid and heat treatments and characterized using XRD, SEM and TEM. Purified MWNT have been decorated with nanocrystalline Pd, Pt and Pt-Ru metal clusters using a simple chemical reduction method. The characterization of metal decorated CNTs were done by using XRD, SEM, TEM, HRTEM and EDX. Nanocrystalline Pd, Pt and Pt-Ru metal clusters decorated MWNT field emitters have been fabricated over graphitized carbon fabric using spin coating method. The field emission characteristics have been studied using an indigenously fabricated set up and the results are discussed. The samples show excellent emission properties with a fairly stable emission current over a period of 4 h. As the presence of the graphitic layer provides strong adhesion between the nanotubes and carbon cloth, the use of graphitized carbon cloth as substrate opens new possibilities for CNT field emitters. � 2007 Springer Science+Business Media B.V.
ISSN: 13880764
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