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Narrowed bandgaps and stronger excitonic effects from small boron nitride nanotubes

Yu, Jun X; Yu, Dehong; Chen, Ying; Chen, Hua; Lin, Meng-Yeh; Cheng, Bing-Ming; Li, Jianbao; Duan, Wenhui

Description

The 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...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
URI: http://hdl.handle.net/1885/60254
Source: Chemical Physics Letters
DOI: 10.1016/j.cplett.2009.06.012

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