TY - JOUR
T1 - Synthesis and optical characterization of carbon nanotube arrays
AU - Rahman, Md Mahfuzur
AU - Younes, Hammad
AU - Ni, George
AU - Zhang, Tie Jun
AU - Al Ghaferi, Amal
N1 - Funding Information:
This work was partially funded under the Cooperative Agreement between the Masdar Institute of Science and Technology, Abu Dhabi, UAE and the Massachusetts Institute of Technology, Cambridge, MA, USA , Reference Number 02/MI/MIT/CP/11/07633/GEN/G/00. The authors would like to acknowledge the valuable support from Dr. Nalin of AIXTRON CVD manufacturing company Ltd., London, UK and also Raman characterization from Hitesh Mamgain, Application Scientist, Toshniwal Bros(SR) Pvt. Ltd., Sanjaynagar, 1st-Stage, Bangalore, India 560 094.
Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - Catalyst annealing time and growth pressure play a crucial role in the chiral selective and high-efficiency growth of single-walled carbon nanotubes (SWCNTs) during low pressure chemical vapor deposition (LPCVD). We achieved a high growth rates for SWCNTs and a change the chiral distribution towards metallic (n, m) increasing the catalyst annealing time in hydrogen. A strong correlation is revealed between the catalyst annealing time at lower growth pressures and the shape of the G band, which indicates the metallic or semiconducting nature of the SWCNT and predict the chirality distribution. Under a 15 min annealing time and 10 mbar of growth pressure, the bottom of the G band is broadened with a sharp G- peak, and the G-band exhibited asymmetrical Breit-Wigner-Fano (BWF) shape. In addition, the growth of SWCNTs with smaller diameters and rich in metallic character is confirmed by the shift of the G-band to a smaller Raman frequency. Homogeneity and vertical alignment of as-grown SWCNT arrays are optically studied using UV/vis/NIR Spectrophotometer. Wavelength-independent and low reflectance resulted from the growth of uniform arrays of SWCNTs. Because of their tunable electronic and optical properties, selective growth of SWCNTs promises great application potential, particularly in electronics and solar industries.
AB - Catalyst annealing time and growth pressure play a crucial role in the chiral selective and high-efficiency growth of single-walled carbon nanotubes (SWCNTs) during low pressure chemical vapor deposition (LPCVD). We achieved a high growth rates for SWCNTs and a change the chiral distribution towards metallic (n, m) increasing the catalyst annealing time in hydrogen. A strong correlation is revealed between the catalyst annealing time at lower growth pressures and the shape of the G band, which indicates the metallic or semiconducting nature of the SWCNT and predict the chirality distribution. Under a 15 min annealing time and 10 mbar of growth pressure, the bottom of the G band is broadened with a sharp G- peak, and the G-band exhibited asymmetrical Breit-Wigner-Fano (BWF) shape. In addition, the growth of SWCNTs with smaller diameters and rich in metallic character is confirmed by the shift of the G-band to a smaller Raman frequency. Homogeneity and vertical alignment of as-grown SWCNT arrays are optically studied using UV/vis/NIR Spectrophotometer. Wavelength-independent and low reflectance resulted from the growth of uniform arrays of SWCNTs. Because of their tunable electronic and optical properties, selective growth of SWCNTs promises great application potential, particularly in electronics and solar industries.
KW - B. Chemical synthesis
KW - B. Optical properties
KW - C. Electron microscopy
KW - C. Raman spectroscopy
KW - D. Catalytic properties
UR - https://www.scopus.com/pages/publications/84957607652
U2 - 10.1016/j.materresbull.2016.01.050
DO - 10.1016/j.materresbull.2016.01.050
M3 - Article
AN - SCOPUS:84957607652
SN - 0025-5408
VL - 77
SP - 243
EP - 252
JO - Materials Research Bulletin
JF - Materials Research Bulletin
ER -