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In this note, we report a Raman spectroscopy study of annealing-inducedeffects on graphene samples prepared by the microexfoliation method. It wasshown that randomly located adhesive residues often contaminate nearby graphenesheets during thermal annealing. The contamination on graphene can be as thinas ~1 nm, but gives several new Raman bands of unusually strong intensity. Wealso find that their intensity is strongly dependent on the excitationwavelength implying that graphene-induced Raman enhancement may be operative.The current study also suggests that graphene can be selectively sensitivetowards certain molecular species in binding, which can be exploited forinteresting application.

Raman Spectroscopy Study of Annealing-Induced Effects on Graphene Prepared by Micromechanical Exfoliation