Diameter Modulation by Fast Temperature Control in Laser-Assisted Chemical Vapor Deposition of Single-Walled Carbon Nanotubes
Diameter modulation by fast temperature control in laser-assisted chemical vapor deposition (LCVD) was successfully achieved to tune the diameters of single-walled carbon nanotubes (SWNTs) in different segments. Due to the inverse relationship between the SWNT diameter and the growth temperature, SWNTs with ascending diameters were obtained by reducing the LCVD temperature from high to low. The diameter-modulated SWNTs were integrated in electrodes to form field-effect transistors (FETs) and to investigate their electronic transport properties. The SWNTs in the FET structures have electronic properties similar to Schottky diodes, indicating clear evidence of different bandgap structures at the two 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 the SWNTs.
M. Mahjouri-Samani et al., "Diameter Modulation by Fast Temperature Control in Laser-Assisted Chemical Vapor Deposition of Single-Walled Carbon Nanotubes," Nanotechnology, Institute of Physics - IOP Publishing, Jan 2010.
The definitive version is available at http://dx.doi.org/10.1088/0957-4484/21/39/395601
Mechanical and Aerospace Engineering
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