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(Color online) (a) Raman spectra of SLG, R6G molecules adsorbed on SLG and on SiO2 substrate. (b) Optical conductivity spectra of SLG as well as that of R6G on SLG.
(Color online) (a) Raman spectra of R6G adsorbed on aged, annealed and fresh SLG samples. (b) 2D bands of aged, annealed and fresh SLG samples.
(Color online) Raman intensity of R6G adsorbed on fresh, annealed and aged SLG samples. Three different vibration bands from R6G on those different substrates are compared. The Raman intensity of 1648 cm−1 band given in this figure is 75% of the original value.
(Color online) AFM image of graphene samples before annealing (a) and after annealing at 500 °C (c). (b) and (d) are the height distributions of graphene samples along straight lines given in (a) and (c).
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