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Narrowed bandgaps and stronger excitonic effects from small boron nitride nanotubes
journal contribution
posted on 2009-01-01, 00:00 authored by J Yu, D Yu, Ying (Ian) ChenYing (Ian) Chen, M Y Lin, B M Cheng, J Li, W DuanThe bandgap of boron nitride nanotubes (BNNTs) is generally considered to be independent on tube radius and chirality. However, we have observed that the bandgaps of BNNTs do depend on the tube size. Photoluminescence excitation spectroscopy with variable photon energies in vacuum ultraviolet (VUV) range revealed that the bandgap becomes smaller when the tube diameter decreases. This is consistent with red-shifted luminescent emissions. The strong interactions between excitons and phonons are possibly responsible for the bandgap narrowing as the function of nanotube size. 2009 Elsevier B.V. All rights reserved.
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Journal
Chemical physics lettersVolume
476Pagination
240 - 243Publisher
Elsevier BVLocation
Amsterdam, NetherlandsPublisher DOI
ISSN
0009-2614eISSN
1873-4448Language
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
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