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Spectroscopic Characteristics of Differently Produced Single‐Walled Carbon Nanotubes
Author(s) -
Li Zhongrui,
Zheng Liqiu,
Yan Wensheng,
Pan Zhiyun,
Wei Shiqiang
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900124
Subject(s) - carbon nanotube , materials science , raman spectroscopy , graphite , optical properties of carbon nanotubes , raman scattering , absorption (acoustics) , laser ablation , electric arc , nanotechnology , nanotube , metal , absorption spectroscopy , analytical chemistry (journal) , chemical engineering , laser , composite material , optics , chemistry , electrode , organic chemistry , physics , engineering , metallurgy
Abstract Single‐walled carbon nanotubes (SWNTs) synthesized with different methods are investigated by using multiple characterization techniques, including Raman scattering, optical absorption, and X‐ray absorption near edge structure, along with X‐ray photoemission by following the total valence bands and C 1s core‐level spectra. Four different SWNT materials (produced by arc discharge, HiPco, laser ablation, and CoMoCat methods) contain nanotubes with diameters ranging from 0.7 to 2.8 nm. The diameter distribution and the composition of metallic and semiconducting tubes of the SWNT materials are strongly affected by the synthesis method. Similar sp 2 hybridization of carbon in the oxygenated SWNT structure can be found, but different surface functionalities are introduced while the tubes are processed. All the SWNTs demonstrate stronger plasmon resonance excitations and lower electron binding energy than graphite and multiwalled carbon nanotubes. These SWNT materials also exhibit different valence‐band X‐ray photoemission features, which are considerably affected by the nanotube diameter distribution and metallic/semiconducting composition.