title: Temperature dependent Raman spectra of isolated suspended single-walled carbon nanotubes.
abstract: Ultralong isolated single-walled carbon nanotubes (SWCNTs) were synthesized on a SiO₂/Mo mesh to fabricate long individual suspended SWCNT samples. We detected a delicately temperature dependent Raman RBM, G and G' band frequency shift and linewidth increase of these SWCNTs in the range of 240-600 K. Softening of force constants induced redshift and the mechanism of corresponding spectra linewidth evolution with temperature was analysed and compared with previously reported theories and experimental results. Temperature coefficient differences between G(-) and G(+) were not observed, but the linewidth broadening tendency differences of G(-) and G(+) are obvious. In addition, temperature-dependent G' band evolution, including both frequency red-shifting and FWHM increase has been reported here first. These results will facilitate understanding of the second order Raman scattering process in SWCNTs. Different temperature coefficients measured on suspended and supported parts of the same SWCNT verifies the substrate's influence.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. ssxie@iphy.ac.cn.
authors.forename: Xiao
authors.initials: X
authors.lastname: Zhang
authors.forename: Feng
authors.initials: F
authors.lastname: Yang
authors.forename: Duan
authors.initials: D
authors.lastname: Zhao
authors.forename: Le
authors.initials: L
authors.lastname: Cai
authors.forename: Pingshan
authors.initials: P
authors.lastname: Luan
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.forename: Wenbin
authors.initials: W
authors.lastname: Zhou
authors.forename: Nan
authors.initials: N
authors.lastname: Zhang
authors.forename: QingXia
authors.initials: Q
authors.lastname: Fan
authors.forename: Yanchun
authors.initials: Y
authors.lastname: Wang
authors.forename: Huaping
authors.initials: H
authors.lastname: Liu
authors.forename: Weiya
authors.initials: W
authors.lastname: Zhou
authors.forename: Sishen
authors.initials: S
authors.lastname: Xie
mesh_terms: D006358:Hot Temperature; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013059:Spectrum Analysis, Raman
chemical_list: D037742:Nanotubes, Carbon