The structure of chemical vapor deposited graphene substrates for graphene-enhanced Raman spectroscopy

Defects and nanocrystalline grain structures play a critical role in graphene-enhanced Raman spectroscopy (GERS). In this study, we selected three types of few-layer, polycrystalline graphene films produced by chemical vapor deposition (CVD), and we tested them as GERS substrates. The graphene struc...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2024-05, Vol.36 (19), p.195303
Main Authors: Faggio, G, Politano, G G, Lisi, N, Capasso, A, Messina, G
Format: Article
Language:English
Subjects:
GERS
graphene defects
nanocrystalline CVD graphene
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Summary:Defects and nanocrystalline grain structures play a critical role in graphene-enhanced Raman spectroscopy (GERS). In this study, we selected three types of few-layer, polycrystalline graphene films produced by chemical vapor deposition (CVD), and we tested them as GERS substrates. The graphene structure was controlled by decreasing the CVD temperature, thus obtaining (i) polycrystalline with negligible defect density, (ii) polycrystalline with high defect density, (iii) nanocrystalline. We applied rhodamine 6G as a probe molecule to investigate the Raman enhancement. Our results show that nanocrystalline graphene is the most sensitive GERS substrate, indicating that the GERS effect is primarily connected to the nanocrystalline structure, rather than to the presence of defects.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ad238a