Matrix-imposed stress-induced shifts in the photoluminescence of single-walled carbon nanotubes at low temperatures

被引:39
作者
Arnold, K
Lebedkin, S [1 ]
Kiowski, O
Hennrich, F
Kappes, MM
机构
[1] Forschungszentrum Karlsruhe, Inst Nanotechnol, D-76021 Karlsruhe, Germany
[2] Univ Karlsruhe, Inst Phys Chem, D-76128 Karlsruhe, Germany
关键词
D O I
10.1021/nl048630c
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Photoluminescence spectra of water-surfactant dispersions of semiconducting single-walled carbon nanotubes (SWNTs) show large shifts of interband transition energies upon freezing and cooling the dispersions to 16 K. This is accompanied by an increase of the emission intensities up to similar to10 times in the presence of poly(vinylpyrrolidone). The shifts develop mainly in the temperature interval of similar to100-240 K and are reversible by cycling the temperature. Two groups of nanotubes classified by the value of (n-m) mod 3, where n,m are structure indices, demonstrate opposite shifts, the largest ones from nanotubes with small chiral angles. The experimental data agree well with calculations of Yang et al. [Phys. Rev. B 1999, 60, 13874] for SWNTs under axial compression and indicate that large stresses of up to similar to5 GPa are generated in individual nanotubes by thermal contraction of the ice matrix.
引用
收藏
页码:2349 / 2354
页数:6
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