Figure 2

Raman spectra of fabricated films. From RGO + TCNQ complex film (red line), RGO film (black line) and TCNQ single crystal (blue line) with an image of TCNQ molecular structure. The Raman spectrum of the RGO + TCNQ complex consists of peaks from TCNQ and RGO (and other unknown peaks). The shifts in the Raman peaks from the TCNQ in RGO + TCNQ complex indicates a charge transfer interaction.