Issue 18, 2013

Investigation on the electronic structure of BN nanosheets synthesized via carbon-substitution reaction: the arrangement of B, N, C and O atoms

Abstract

Graphene-like BN nanosheets were synthesized via carbon-substitution reaction using graphene as a template in an attempt to produce C-doped BN. The carbon residue was removed by high-temperature oxidation in air. The role of the graphene template and oxygen with regard to the local structure of BN and its defect-related optical luminescence are investigated using X-ray absorption near-edge structure (XANES) and X-ray excited optical luminescence (XEOL). The structure and bonding of B, N, C and O in different chemical environments before and after oxidation are revealed by XANES. It is found that B and N atoms tend to form large BN domains, whereas the formation of B–C or N–C bonding is not significant. Two types of O local structures are found under different oxidation temperatures, as revealed by XANES: moderate oxidation results in O substituting N, while B2O3-like local structure is formed under higher oxidation temperature. The two types of O-related defects exhibit different luminescence properties.

Graphical abstract: Investigation on the electronic structure of BN nanosheets synthesized via carbon-substitution reaction: the arrangement of B, N, C and O atoms

Article information

Article type
Paper
Submitted
02 Feb 2013
Accepted
15 Mar 2013
First published
18 Mar 2013

Phys. Chem. Chem. Phys., 2013,15, 6929-6934

Investigation on the electronic structure of BN nanosheets synthesized via carbon-substitution reaction: the arrangement of B, N, C and O atoms

L. Liu, T. Sham and W. Han, Phys. Chem. Chem. Phys., 2013, 15, 6929 DOI: 10.1039/C3CP50498K

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