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Green synthesis, photocatalytic and photoelectrochemical performance of Au-Graphene nanocomposite
RSC Advances (2015)
  • Mohammad Ehtisham Khan, School of Chemical Engineering Yeungnam University
Abstract
A simplistic and environmentally friendly approach using electrochemically active biofilms (EABs) was
developed for the synthesis of an AuGraphene (AuG) nanocomposite without the use of surfactants
or capping agents. The as-prepared AuG nanocomposite was characterized by X-ray diffraction, diffuse
reflectance spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, photoluminescence
spectroscopy, and transmission electron microscopy. In this study, the anchoring of gold nanoparticles
(AuNPs) on graphene sheets was achieved using an EAB. The EAB assists in the bio-reduction of Au3+ to
Au0, and the AuNPs prevent the aggregation of graphene sheets and keep them apart because of the
decrease in attractive forces between the graphene layers. The photocatalytic activities of the AuG
nanocomposite were evaluated by the photocatalytic degradation of methylene blue in an aqueous
solution at ambient temperature in the dark and under visible-light irradiation. The photocatalytic activity
of the AuG nanocomposite was enhanced significantly by the loading of AuNPs onto graphene sheets.
The photocurrent of the AuG nanocomposite was measured by linear sweep voltammetry, which
exhibited much better performance than pure graphene. The high photocatalytic activity and
photocurrent of the AuG nanocomposite was attributed mainly to the anchoring of AuNPs on the
graphene sheets. The synergistic effects of the surface plasmonic resonance of AuNPs and the specific
electronics effect of graphene holds great promise for the development of electrochemical devices.
Therefore, the AuG nanocomposite has potential in several fields, such as photocatalysis, photovoltaic,
nanoelectronics, ultracapacitors, and sensors because of the enhanced photocatalytic and
photoelectrochemical performance.
Keywords
  • EAB,
  • Au NPs,
  • Au-Graphene,
  • Nanocomposite,
  • photocatalysis,
  • photoelectrochmical
Disciplines
Publication Date
Winter March 6, 2015
Citation Information
Mohammad Ehtisham Khan. "Green synthesis, photocatalytic and photoelectrochemical performance of Au-Graphene nanocomposite" RSC Advances (2015)
Available at: http://works.bepress.com/mohammadehtisham-khan/3/