Improving the accuracy of international standards for graphene

15th June 2022
Paige West

The results of the first international comparison of the measurement of graphene have been published in 2D Materials, led by the National Physical Laboratory (NPL) in the UK, through the Versailles Project on Advanced Materials and Standards (VAMAS) and in collaboration with institutes from around the world.

The international interlaboratory comparison (ILC) outlined improvements that reduce measurement uncertainty, in some cases by a factor of 15, and which will be the basis for a new international standard which is currently under development within ISO/IEC for Raman spectroscopy. This will provide a verified source of data and ultimately provide more accurate and precise measurement standards for the global graphene industry.

Although a wonder material with many superlative properties set to disrupt industries ranging from electronics to construction, as a single layer of carbon atoms, graphene can be difficult to measure. There is a pressing need for reliable, reproducible, and accurate measurements of graphene’s properties, through international standards, to facilitate industrial growth.

Processes such as chemical vapour deposition (CVD) allow companies around the world to now produce graphene on the scale of metres, but a standardised measurement method to determine the quality of the material is still under development within the International Organisation for Standardisation (ISO) and International Electrotechnical Commission (IEC).

VAMAS was established in 1982 by the G7 group of nations to ensure best practice plus accurate and precise standardised measurement methods, in order to promote and grow world trade. More recently in 2016, a technical working area was established for ‘Graphene and Related 2D Materials’, that now has 14 active projects.

The first of these projects is the measurement of CVD grown graphene using Raman spectroscopy, a go-to measurement technique for understanding the structure of graphene related 2D materials. The Industrialisation Work Package (WP19) of the EU Graphene Flagship funded NPL’s work to lead this international ILC consisting of 17 entities, including National Metrology Institutes, Universities, and industry, with CVD grown graphene samples supplied by Graphenea Semiconductor, Spain.

Many of the measurements for these VAMAS ILCs have been completed, however there are several projects that have been recently initiated and looking for participants. These projects will also contribute to other international standards, ultimately improving the accuracy of the measurement of graphene and other 2D materials and, in doing so enabling industry around the world.

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