Electronic structure,magnetic properties,and microstructural analysis of thiol-functionalized Au nanoparticles: role of chemical and structural parameters in the ferromagnetic behaviour |
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Authors: | Guerrero Estefana Muoz-Mrquez Miguel A Fernndez-Pinel Enrique Crespo Patricia Hernando Antonio Fernndez Asuncin |
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Institution: | (1) Alternative Energy Technology Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India;(2) Low Temperature Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India |
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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. |
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Keywords: | Carbon nanotubes Chemical vapour deposition Alloy hydride DyNi2 alloy hydride Flexible graphitized carbon cloth CNT field emitter Fowler– Nordheim theory Nanocrystalline metal cluster |
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