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(a) Raman spectrum of graphene on SiO2/Si with characteristics as marked. (b) Optical micrograph image of graphene film on PET substrate.
(a) and (b) Topography of bare PET substrate. Nanometer scale fixtures, arising from silicone adhesive, are regularly distributed. (c) and (d) Corresponding EFM amplitude images of (a) and (b), respectively. Tapping amplitude distribution derived from the electrostatic force between bare PET substrate and Au-coated AFM is shown. (e) Case (a) exhibits higher tapping amplitude (less electrostatic attractive) distribution than the (b).
(a) and (b) The topography of transferred graphene on PET substrate. Graphene boundaries in (a) are clearly visible, whereas those in (b) are barely visible due to stretched formation of graphene boundaries toward the PET surface. (c) and (d) Corresponding EFM amplitude images of (a) and (b), respectively. Electrostatic amplitude distribution derived from the electrostatic force between the transferred graphene and Au-coated AFM is shown. (e) Dotted line profiles of each topography to clearly identify the transferred graphene boundaries shapes. The upper line profile shows the case of (a) and the bottom line profile indicates (b) case. (f) Statistical distribution of electrostatic amplitude of each case. Red and black histogram indicates the (d) and (c) cases, respectively. The strong electrostatic attractive force with PET surface and correlating higher sheet resistance value are displayed in the red histogram, whereas weak electrostatic attractive force with PET surface and correlating lower sheet resistance value are shown in the black histogram.
Experimentally demonstrated graphene film structure on PET substrate. Smaller and stronger attractive graphene with underlying PET substrate are displayed as dotted and dashed lines, respectively, with the support of silicone adhesive particles.
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