File(s) under permanent embargo

Narrowed bandgaps and stronger excitonic effects from small boron nitride nanotubes

journal contribution
posted on 01.01.2009, 00:00 authored by J Yu, D Yu, Ying (Ian) ChenYing (Ian) Chen, M Y Lin, B M Cheng, J Li, W Duan
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 possibly responsible for the bandgap narrowing as the function of nanotube size. 2009 Elsevier B.V. All rights reserved.

History

Journal

Chemical physics letters

Volume

476

Pagination

240 - 243

Publisher

Elsevier BV

Location

Amsterdam, Netherlands

ISSN

0009-2614

eISSN

1873-4448

Language

eng

Publication classification

C1 Refereed article in a scholarly journal