Increased chemical enhancement of Raman spectra for molecules adsorbed on fluorinated reduced graphene oxide
2012
Yu, Xinxin | Lin, Ke | Qiu, Keqiang | Cai, Hongbing | Li, Xinjing | Liu, Jinyang | Pan, Nan | Fu, Shaojun | Luo, Yi | Wang, Xiaoping
Fluorinated reduced graphene oxide (F-RGO) is prepared by CF₄ plasma treatment of RGO. The fluorine (F) doping is confirmed by X-ray photoelectron spectroscopy and its content is directly related to the plasma exposure time. A modest p-doping effect of the fluorination is observed from the electrical measurements. It is found that the F-RGO is an even better substrate for surface enhanced Raman spectroscopy of molecules than RGO. The relative enhancement factor can be tuned by manipulating the F content in the F-RGO. The effect is attributed to the presence of the strong local electric field induced by the local dipoles of F-containing groups on the F-RGO surface. This shows that the formation of well-designed surface dipoles could be a general way to increase the chemical enhancement of molecular Raman spectra.
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