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The role of catalysts and temperature on morphology and field emission properties of decorated C:N nano-tubular structures

Published online by Cambridge University Press:  15 March 2011

Ralph Kurt ,
Jean-Marc Bonard  and
Ayatollah Karimi
Ralph Kurt
Affiliation:
Department of Physics, Swiss Federal Institute of Technology (EPFL) CH – 1015 Lausanne, Switzerland
Jean-Marc Bonard
Affiliation:
Department of Physics, Swiss Federal Institute of Technology (EPFL) CH – 1015 Lausanne, Switzerland
Ayatollah Karimi
Affiliation:
Department of Physics, Swiss Federal Institute of Technology (EPFL) CH – 1015 Lausanne, Switzerland
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Abstract

A hot filament chemical vapour deposition (HF-CVD) process was used to synthesise nitrogenated carbon (C:N) nanotubes characterised by feather-like decoration of the tube surface. As a function of deposition temperature the diameter of the produced tubular structures could be adjusted in a controlled way ranging from 1 µm to 50 nm. The influence of catalysts was demonstrated comparing the morphology of catalytically grown tubes with tubes grown onto pure Si wafers. High resolution TEM reveals that the nanotubes are hollow with a wall structure consisting of inner ordered walls and an outer more disordered surface. A possible growth mechanism will be discussed. Furthermore, field emission in vacuum was studied and showed a spectacular correlation to the deposition temperature and therefore the diameter of the C:N tubes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 633: Symposium A – Nanotubes and Related Materials , 2000 , A13.2
Copyright
Copyright © Materials Research Society 2001

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