9-13 July 2012
Africa/Johannesburg timezone
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First-principles studies of extrinsic and intrinsic defects in boron nitride nanotubes

Presented by Mr. Matete MASHAPA on 12 Jul 2012 from 17:30 to 19:30
Type: Poster Presentation
Session: Poster Session
Track: Track G - Theoretical and Computational Physics

Abstract

Spin polarized density functional theory has been used to investigate the structural, stability and electronic properties of extrinsic and intrinsic defects in boron nitride nanotubes. Carbon substitutional defects, CB under N-rich growth condition, and CN under B-rich growth condition, presented the lowest heats of formations compared to boron and nitrogen antisites. Creating a CB defect reduces the band gap of the nanotube in both armchair and zig-zag geometries. Therefore, the substitutional carbon atom affects the electronic properties of the nanotube in such a way that it goes from insulator to a semiconductor or metal. BN in the N-rich environment and NB in the B-rich environment, have lower heats of formations, also BN and NB are stable in the reverse atmosphere and have the main characteristic is that among all defects, they present the highest heats of formations in the reverse atmospheres in both zig-zag and armchair nanotubes.

Award

Yes

Level

PhD

Supervisor

Prof. Nithaya Chetty,University of Pretoria email: nithaya.chetty@up.ac.za

Paper

no

Place

Location: IT Building
Room:


Primary authors

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