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From graphene oxide to pristine graphene: revealing the inner workings of the full structural restoration

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Academic year: 2020

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Table 1 Atomic composition calculated from XPS spectra and amount of CO and CO 2  released  during TPD up to 1273 K for graphene oxide and reduced graphene oxide paper-like films
Figure 1 Nanometer-scale AFM images for the unreduced (a,d,g), mildly reduced (b,e,h) and highly  reduced (c,f,i) graphene oxide sheets deposited on top of a HOPG substrate, prior to the thermal  treatment (a-c) and annealed at 1773 K (d-f) and 2073 K (g-i
Figure 2 Nanometer- and atomic-scale STM images for the highly reduced graphene oxide sheets  prior to the thermal treatment (a,b) and after annealing at 1773 K (c,d), 1923 K (e,f), 2073 K (g,h)  and 2223 K (i,j)
Figure 3  High resolution N1s core level XPS spectrum of the sample treated at 1773 K (black  line), together with its deconvolution into two components at 401.6 eV (red line) and 399.2 eV  (blue line), which are assigned to quaternary and pyridinic nitrog
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