9-13 July 2012
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=11&confId=14"><font color=#ff0000>SAIP2012 PROCEEDINGS AVAILABLE</font></a>

First-principles studies of extrinsic and intrinsic defects in boron nitride nanotubes

12 Jul 2012, 17:30
IT Building

IT Building

Poster Presentation Track G - Theoretical and Computational Physics Poster Session


Mr Matete Mashapa (CSIR)

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Abstract content <br> &nbsp; (Max 300 words)

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.

Main supervisor (name and email)<br>and his / her institution

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

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