Science Advances

Supplementary Materials

This PDF file includes:

  • Supplementary Materials and Methods
  • fig. S1. NG sheets on different substrates and their typical Raman spectra with different synthesis conditions.
  • fig. S2. Raman mapping of PG and NG showing monolayer coverage.
  • fig. S3. XPS spectra (C1s and N1s) of NG synthesized at 850°C.
  • fig. S4. Probing-enhanced Raman scattering effect between NG and PG sheets for different dye molecules.
  • fig. S5. Comparison of Raman spectra with bare SiO2/Si substrates and NG for probing different dye molecules at their resonant condition.
  • fig. S6. Enhancement factors for three different dye molecules between NG and PG.
  • fig. S7. Comparison of GERS and SERS by applying sputtered Au nanoparticles as SERS substrates for comparison.
  • fig. S8. Testing the molecular sensibility of the NG with different laser energies.
  • fig. S9. Photos of RhB in ethanol solution with different concentrations.
  • fig. S10. AFM images of NG samples with different concentrations of RhB.
  • fig. S11. Raman spectrum of 5 × 10−12 M RhB on NG.
  • fig. S12. Probing GERS effect between NG and PG for additional molecules such as R6G and PPP.
  • table S1. Calculated HOMO-LUMO gap, adsorption data, and resonant Raman laser excitation energy for each molecule.

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