Apr 4, 2014
Electrochemically synthesised few-layer graphene withstands high-temperatures
Researchers in India and Germany demonstrate an approach for synthesising few layers graphene sheets that are suitable for high temperature applications.
Graphene, a two dimensional honeycomb lattice with its unusual electrical, mechanical, and thermal properties as one of the most promising materials in future electronics and nanotechnology. Due to exotic physical properties of graphene, a large majority number of the studies of have been directed towards its synthesis. , because the physical properties depend upon production method. Various approaches such as mechanical exfoliation, reduced graphene oxide by solution method and chemical vapor deposition (CVD) have been reported. The physical properties of the resulting grapheme depend upon production method. Graphene prepared by mechanical exfoliation is too small to be utilized for mass production of functional devices. Reduced graphene oxide prepared by solution method contains defects and higher additional functional groups that hampers its electronic properties. Chemical vapor deposition (CVD) enables the synthesis of large-area, high-quality graphene sheets. However, the unavoidable formation of grain boundaries in graphene prepared by CVD has a detrimental effect on its electronic, thermal and mechanical properties.
As evidenced from the discovery and physical properties of graphene which was obtained by K. S. Novoselov, A. K. Geim in 2004, to utilize graphene for its predicted applications, an alternative technique for the synthesis of good quality large area graphene sheets in large scale directly from graphite is essential. We demonstrate an electrochemical technique for the large scale synthesis of high quality single layer graphene sheet and few layer graphene sheets directly from graphite using oxalic acid (a weak acid) as the electrolyte.
One of the interesting observations is that the FLGS are stable at least up to 800oC and hence have potential application in solid oxide fuel cells as a gas diffusion layer. The quality of graphene prepared by this technique is comparatively better than other preparation methods because it has been prepared directly from graphite and there is no further chemical processing is associated. Currently, our efforts for with this technique is have beeb focused on to preparinge specifically large quantities of single layer graphene sheets by modifying the experimental preparation conditions. Even then graphene prepared by this method could be used in various applications. Collaboration with industries will be made for wider commercialization for of the preparation technique of for better graphene sheets.
Full details at Chemical Communication.
About the author
Pitamber Mahanandia is affiliated with the National Institute of Technology in India, Frank Simon and Gert Heinrich are affiliated with the Leibniz-Institute fur Polymerforschung in Germany and Karuna Kar Nanda is affiliated with the Indian Institute of Science in India.