Isotope effect on band gap and radiative transitions properties of boron nitride nanotubes

被引：80

作者：

Han, Wei-Qiang ^{[1
]}

Yu, Hua-Gen ^{[2
]}

Zhi, Chunyi ^{[3
]}

Wang, Jianbin ^{[3
]}

Liu, Zhenxian ^{[4
]}

Sekiguchi, Takashi ^{[3
]}

Bando, Yoshio ^{[3
]}

机构：

[1] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA

[2] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA

[3] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[4] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

来源：

NANO LETTERS | 2008年 / 8卷 / 02期

关键词：

D O I：

10.1021/nl0726151

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We have carried out an isotope study on the band gap and radiative transition spectra of boron nitride nanotubes (BNNTs) using both experimental and theoretical approaches. The direct band gap of BNNTs was determined at 5.38 eV, independent of the nanotube size and isotope substitution, by cathodoluminescences (CL) spectra. At lower energies, several radiative transitions were observed, and an isotope effect was revealed. In particular, we confirmed that the rich CL spectra between 3.0 and 4.2 eV reflect a phonon-electron coupling mechanism, which is characterized by a radiative transition at 4.09 eV. The frequency. red shift and peak broadening due to isotopic effect have been observed. Our Fourier transform infrared spectra and density functional theory calculations suggest that those radiative transitions in BNNTs could be generated by a replacement of some nitrogen atoms with oxygen.

引用

页码：491 / 494

页数：4

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