A micro-magneto-Raman scattering study of graphene on a bulk graphite substrate

TL;DR

This study uses magneto-Raman scattering to identify and analyze graphene flakes on bulk graphite, revealing their electronic excitation spectra and how they are affected by different laser energies.

Contribution

It demonstrates a method to locate and characterize graphene flakes on bulk graphite using magneto-Raman scattering with spatial mapping and excitation wavelength variation.

Findings

Graphene-like electronic spectra can be identified on bulk graphite surface.

Multiple flakes can coexist and retain their spectral signatures.

Excitation wavelength influences the Raman scattering response.

Abstract

We report on a magneto-Raman scattering study of graphene flakes located on the surface of a bulk graphite substrate. By spatially mapping the Raman scattering response of the surface of bulk graphite with an applied magnetic field, we pinpoint specific locations which show the electronic excitation spectrum of graphene. We present the characteristic Raman scattering signatures of these specific locations. We show that such flakes can be superimposed with another flake and still exhibit a graphene-like excitation spectrum. Two different excitation laser energies (514.5 and 720 nm) are used to investigate the excitation wavelength dependence of the electronic Raman scattering signal.