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Title: Synthesis and optical characterization of carbon nanotube arrays

Abstract

Highlights: • Controlling metallicity and vertical alignment of CNT forest by changing hydrogen catalyst annealing time and growth pressure. • Verifying metallicity using Raman spectroscopy of top CNT layer. • Optical characterization of CNT forest using UV–vis–NIR spectrophotometer. - Abstract: 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{sup −} 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 aremore » 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.« less

Authors:
 [1];  [2];  [1]
  1. Institute Centre for Energy (iEnergy), Mechanical and Materials Engineering Department, Masdar Institute of Science and Technology (MIST), P.O. Box 54224, Abu Dhabi (United Arab Emirates)
  2. Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 (United States)
Publication Date:
OSTI Identifier:
22581542
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 77; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNEALING; CARBON NANOTUBES; CATALYSTS; CHEMICAL VAPOR DEPOSITION; CHIRALITY; ELECTRON MICROSCOPY; HYDROGEN; LAYERS; METALLICITY; NEAR INFRARED RADIATION; RAMAN SPECTROSCOPY; SPECTRAL REFLECTANCE; SPECTROPHOTOMETRY; SYNTHESIS; ULTRAVIOLET RADIATION; VISIBLE RADIATION

Citation Formats

Rahman, Md. Mahfuzur, E-mail: mrahman@masdar.ac.ae, Younes, Hammad, Ni, George, Zhang, TieJun, and Al Ghaferi, Amal, E-mail: aalghaferi@masdar.ac.ae. Synthesis and optical characterization of carbon nanotube arrays. United States: N. p., 2016. Web. doi:10.1016/J.MATERRESBULL.2016.01.050.
Rahman, Md. Mahfuzur, E-mail: mrahman@masdar.ac.ae, Younes, Hammad, Ni, George, Zhang, TieJun, & Al Ghaferi, Amal, E-mail: aalghaferi@masdar.ac.ae. Synthesis and optical characterization of carbon nanotube arrays. United States. doi:10.1016/J.MATERRESBULL.2016.01.050.
Rahman, Md. Mahfuzur, E-mail: mrahman@masdar.ac.ae, Younes, Hammad, Ni, George, Zhang, TieJun, and Al Ghaferi, Amal, E-mail: aalghaferi@masdar.ac.ae. Sun . "Synthesis and optical characterization of carbon nanotube arrays". United States. doi:10.1016/J.MATERRESBULL.2016.01.050.
@article{osti_22581542,
title = {Synthesis and optical characterization of carbon nanotube arrays},
author = {Rahman, Md. Mahfuzur, E-mail: mrahman@masdar.ac.ae and Younes, Hammad and Ni, George and Zhang, TieJun and Al Ghaferi, Amal, E-mail: aalghaferi@masdar.ac.ae},
abstractNote = {Highlights: • Controlling metallicity and vertical alignment of CNT forest by changing hydrogen catalyst annealing time and growth pressure. • Verifying metallicity using Raman spectroscopy of top CNT layer. • Optical characterization of CNT forest using UV–vis–NIR spectrophotometer. - Abstract: 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{sup −} 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.},
doi = {10.1016/J.MATERRESBULL.2016.01.050},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 77,
place = {United States},
year = {2016},
month = {5}
}