Diameter modulation of carbon nanotubes by rapid temperature modulation in laser-assisted chemical vapor deposition

M. Mahjouri-Samani, Y. S. Zhou, W. Xiong, Y. Gao, M. Mitchell, Y. F. Lu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Periodic diameter modulation of carbon nanotubes (CNTs) by quick temperature variation was successfully achieved in laser-assisted chemical vapor deposition process. Tapered and diameter-alternating CNTs were grown by periodic modulation of the temperature due to inverse relationship between the temperature and the diameter of the CNTs. The diameter-modulated single-walled carbon nanotubes (SWNTs) were integrated into field-effect transistors (FETs) structure to investigate their electronic transport properties. The tapered SWNTs showed electronic properties similar to Schottky diodes indicating clear evidence of different bandgaps at two ends of the tubes. However, the electronic transport of the diameter-modulated SWNTs showed a very small current magnitude which is attributed to the large number of defects and the electron confinement in the periodic quantum well arrays. Transmission electron microscopy and Raman spectroscopy were also studied to investigate the structural and electronic properties of the structures.

Original languageEnglish (US)
Title of host publicationLaser-Based Micro- and Nanopackaging and Assembly V
DOIs
StatePublished - 2011
EventLaser-Based Micro- and Nanopackaging and Assembly V - San Francisco, CA, United States
Duration: Jan 25 2011Jan 27 2011

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7921
ISSN (Print)0277-786X

Conference

ConferenceLaser-Based Micro- and Nanopackaging and Assembly V
CountryUnited States
CitySan Francisco, CA
Period1/25/111/27/11

Keywords

  • Bandgap modulation
  • Carbon nanotubes
  • Laser-assisted chemical vapor deposition
  • Quantum well arrays
  • Schottky barrier diodes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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