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Article Dans Une Revue 2D Materials Année : 2022

International interlaboratory comparison of Raman spectroscopic analysis of CVD-grown graphene

Piers Turner
Keith Paton
Alba Centeno
  • Fonction : Auteur
Alessio Sacco
Amaia Pesquera
  • Fonction : Auteur
Amaia Zurutuza
Dusan Losic
Pei Lay Yap
Raul Arenal
Tim Batten
  • Fonction : Auteur
Vaiva Nagyte
Cinzia Casiraghi

Résumé

There is a pressing need for reliable, reproducible and accurate measurements of graphene’s properties, through international standards, to facilitate industrial growth. However, trustworthy and verified standards require rigorous metrological studies, determining, quantifying and reducing the sources of measurement uncertainty. Towards this effort, we report the procedure and the results of an international interlaboratory comparison (ILC) study, conducted under Versailles Project on Advanced Materials and Standards. This ILC focusses on the comparability of Raman spectroscopy measurements of chemical vapour deposition (CVD) grown graphene using the same measurement protocol across different institutes and laboratories. With data gathered from 17 participants across academia, industry (including instrument manufacturers) and national metrology institutes, this study investigates the measurement uncertainty contributions from both Raman spectroscopy measurements and data analysis procedures, as well as provides solutions for improved accuracy and precision. While many of the reported Raman metrics were relatively consistent, significant and meaningful outliers occurred due to differences in the instruments and data analysis. These variations resulted in inconsistent reports of peak intensity ratios, peak widths and the coverage of graphene. Due to a lack of relative intensity calibration, the relative difference reported in the 2D- and G peak intensity ratios ( I 2 D / I G ) was up to 200%. It was also shown that the standard deviation for Γ 2 D values reported by different software packages, was 15× larger for Lorentzian fit functions than for pseudo-Voigt functions. This study has shown that by adopting a relative intensity calibration and consistent peak fitting and data analysis methodologies, these large, and previously unquantified, variations can be significantly reduced, allowing more reproducible and comparable measurements for the graphene community, supporting fundamental research through to the growing graphene industry worldwide. This project and its findings directly underpin the development of the ISO/IEC standard ‘ DTS 21356-2—Nanotechnologies—Structural Characterisation of CVD-grown Graphene ’.
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Dates et versions

hal-03765459 , version 1 (02-09-2022)

Identifiants

Citer

Piers Turner, Keith Paton, Elizabeth Legge, Andres de Luna Bugallo, A Rocha-Robledo, et al.. International interlaboratory comparison of Raman spectroscopic analysis of CVD-grown graphene. 2D Materials, 2022, 9 (3), pp.035010. ⟨10.1088/2053-1583/ac6cf3⟩. ⟨hal-03765459⟩
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