Abstract
Periodic diameter modulation of individual carbon nanotubes (CNTs) by rapid temperature variation in laser-assisted chemical vapor deposition (LCVD) process was successfully achieved. A CO2 laser was used to quickly and precisely modulate the growth temperature. Due to inverse relationship between the diameter of SWNTs and the growth temperature, tapered and diameter-alternating tubes were grown by modulating the CO2 laser power during the growth. The diameter-modulated SWNTs were grown across a pair of Mo electrodes to form field-effect transistors (FETs) for investigation of their electrical and optical properties. Variations in the bandgap of the individual semiconducting SWNTs were detected meaning the formation of multi bandgaps within a single tube. Transmission electron microscopy and Raman spectroscopy were also studied to investigate the structural and electronic properties of the structures.
Original language | English (US) |
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Pages | 1222-1226 |
Number of pages | 5 |
DOIs | |
State | Published - 2011 |
Event | 30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011 - Orlando, FL, United States Duration: Oct 23 2011 → Oct 27 2011 |
Conference
Conference | 30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011 |
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Country/Territory | United States |
City | Orlando, FL |
Period | 10/23/11 → 10/27/11 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials