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Growth of diameter-modulated single-walled carbon nanotubes through instant temperature modulation in laser-assisted chemical vapor deposition

Published online by Cambridge University Press:  23 March 2011

M. Mahjouri-Samani ,
Y. S. Zhou ,
W. Xiong ,
Y. Gao ,
M. Mitchell  and
Y. F. Lu
M. Mahjouri-Samani
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511
Y. S. Zhou
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511
W. Xiong
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511
Y. Gao
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511
M. Mitchell
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511
Y. F. Lu
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511
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Abstract

The diameter of individual single-walled carbon nanotubes (SWNTs) was successfully modulated along their axes by instant temperature control in a laser-assisted chemical vapor deposition (LCVD) process. SWNTs were grown using different temperature profiles to investigate the effects of temperature variation on their growth. Due to the inverse relationship between SWNT diameter and growth temperature, SWNTs with ascending diameters were obtained by reducing the LCVD temperature from high to low. The diameter-modulated SWNTs were grown across a pair of Mo electrodes to form field-effect transistors (FETs) for investigation of their electronic transport properties. Fabricated devices demonstrated properties similar to Schottky diodes, implying different bandgap structures at the ends of the SWNTs. Raman spectroscopy, transmission electron microscopy, and electronic transport characteristics were studied to investigate the influence of temperature variation on the structural and electronic characteristics of SWNTs.

Keywords

laser-induced reactionCnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1284: Symposium C – Fundamentals of Low-Dimensional Carbon Nanomaterials , 2011 , mrsf10-1284-c04-07
Copyright
Copyright © Materials Research Society 2011

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References

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