Journal
NEW JOURNAL OF CHEMISTRY
Volume 44, Issue 39, Pages 16864-16876Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj03909h
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Funding
- National Research Foundation (NRF) [101357, 116505, 103979]
- UKZN Nanotechnology Platform, Tertiary Education Support Programme (TESP)
- University of KwaZulu-Natal (UKZN)
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The design and fabrication of electronic devices based on graphene nanomaterials are dependent on the tuning of Fermi levels. This can be achieved by doping graphene oxide (GO) with an electron-withdrawing (p-type) or electron-donating (n-type) species that causes changes in the electron density and enhances the electrochemical properties. In this research, the effect of boron content on the optical, electrochemical, and conductivity properties of GO was investigated. Boron-doped reduced graphene oxide (B-rGO) was synthesizedviaa chemical vapor deposition method by using GO and varying amounts of boric anhydride, as a boron precursor, at a doping temperature of 600 degrees C. The B-rGO samples were characterized by standard spectroscopic techniques. B-rGO had a sheet structure with various graphene islands and disordered regions. The highest boron content incorporated into the reduced GO framework was 7.12%. B-rGO samples manifested strong absorption in the ultraviolet region. An electronic band structure with a low charge resistance of 20.23 Omega and enhanced electrical conductivity properties of 5.920 S cm(-1) was observed and noted to be dependent on the concentration of boron incorporated. All the B-rGO samples demonstrated a p-type conductivity behaviour which is attributed to an increase in the density of states near the Fermi level. This work opens a new avenue for the fabrication of solar cells based on p-type B-rGO.
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