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Temperature-dependent Raman spectra of bamboo-like boron nitride nanotubes

Articles

Revue/Conférence:

APPLIED PHYSICS EXPRESS

Language:

English

Auteur:

Ren Qijun; Sun Liaoxin; Yu Jun; Shen Xuechu; Chen Zhanghai

Experts:

Lu Jian; Chen Ying

Année:

2014

Volume:

7

Numéro:

2

Pages:

022401

Phonon properties of boron nitride nanotubes (BNNTs) were investigated using Raman spectroscopy at different temperatures and new sp(3)-bonded BN vibrations were identified. The Raman peak of the E-2g mode of BNNTs is found to be downshifted and broadened compared to that of hexagonal BN at the same temperature. By increasing the temperature, the energy of the E-2g mode and the sp(3)-bonding mode are downshifted, with the temperature coefficients being -0.010 and -0.069 cm(-1)/K, respectively. We attribute this downshifting to anharmonic effects as well as the elongation of the B-N bond in BNNT structures with increasing temperature. (C) 2014 The Japan Society of Applied Physics