Fig. 1: Au@SiO2/graphene/Au configuration. | Nature Communications

Fig. 1: Au@SiO2/graphene/Au configuration.

From: Unraveling the energy storage mechanism in graphene-based nonaqueous electrochemical capacitors by gap-enhanced Raman spectroscopy

Fig. 1

a Sandwich configuration of Au substrate coupled with shell-isolated nanoparticles for enhancing Raman signals. F, S, O, N, C, H, and Li atoms are shown in green, yellow, red, cyan, gray, blue, and reseda, respectively. b Electromagnetic field distributions around Au@SiO2/graphene/Au simulated by COMSOL finite element method. c Raman spectra of graphene with different layers. d AFM image of single-layer graphene on a sapphire substrate (with the red dashed line indicating the boundary) and sectional analysis of the white line in the image for measuring the height of the transferred graphene. Scale bar: 300 nm. e TEM mapping analysis of Au@SiO2/graphene/Au. C and Au are shown in red and yellow, respectively. Scale bar: 20 nm.

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