Comparative evaluation of graphene-based substrates in GERS for rhodamine 6G detection

Graphene-enhanced Raman spectroscopy (GERS) is a new method for enhancing Raman spectra based on chemical mechanisms. This article explores three different methods for producing graphene oxide-based substrates to enhance the Raman signal. The first substrate was prepared by spraying a graphene oxide suspension with distilled water onto a glass slide. The second substrate was prepared using graphene oxide powder and ethanol suspension and then sprayed onto a glass slide. The third substrate was prepared by spin-coating a graphene oxide suspension with distilled water onto a glass slide. Rhodamine 6G (R6G) was used to investigate the GERS effect on these three substrates. After depositing the R6G solution on the graphene-based substrates, the enhancement of Raman signals was compared. The experimental results showed that the Raman spectra were most enhanced using the substrate made by the third method.