A Renishaw inVia Raman microscope has been used in new research by an international team to examine film thickness, strain and defects in graphene films.
The international team led by Oxford University scientists Professor Nicole Grobert and Adrian Murdock conducted the research in collaboration with Renishaw plc and researchers from the Forschungszentrum Juelich (Germany) and University of Ioannina (Greece).
The first two-dimensional material to be discovered, Graphene is a single layer of carbon atoms and has very interesting electronic and mechanical properties - it is one of the most conductive materials known to science and has a breaking strength 100 times greater than steel. Typically, when graphene is grown using chemical vapour deposition (CVD), the individual graphene flakes merge with a variety of different orientations, creating defects.
In this work, titled ‘Controlling the Orientation, Edge Geometry and Thickness of Chemical Vapour Deposition Graphene’, and published in the journal ACS Nano, it was found that the orientation of the underlying copper substrate could be used to guide the graphene flakes so they are aligned, and these defects are prevented.
Team member Dr Tim Batten, Raman applications specialist at Renishaw explains that the inVia Raman spectrometer is a very powerful tool for investigating the properties of graphene. The new research gives much better understanding of CVD graphene growth, which will be important for manufacturing graphene on an industrial scale.
In 2006 Professor Andrea Ferrari (University of Cambridge) used a Renishaw Raman spectrometer to conduct the first Raman characterisation of graphene using samples from its discoverers, Nobel Prize winners Professor Andre Geim and Professor Kostya Novoselov (University of Manchester). Since then, researchers worldwide have used data from Renishaw Raman systems in hundreds of scientific papers on graphene, greatly assisting in the understanding and development of this amazing material.
The Renishaw inVia Raman microscope is available from Warsash Scientific .