The process step to produce expanded graphene: (a) graphite flakes, (b) dipped in sulfuric acid to make viscous graphite flakes, (c) expanded graphene sheets after heating treatment, and (d) SEM images of expanded graphene sheets.
Digital images of: (a) GO suspension, (b) GO drop-cast on quartz plate, (c) dried GO paper, (d) GO paper in quartz vial before rapid-heating process, (e) GO paper in quartz vial after rapid-heating process for converting GO to BRGO, (f) the resulting BRGO paper, (g) SEM image of BRGO paper surface, and (h) BRGO suspension.
(a) TGA, (b) XPS, (c) FT-IR, and (d) UV-VIS spectra for GO and BRGO.
(a) XRD spectra of GO, BRGO, and graphite and (b) Raman spectra of GO and BRGO.
(a) I-V characteristics of GO and BRGO. (b) The current plotted in natural logarithm scale as a function of T−1/4. The black squares represent the experimental results, and the red line is a fit of the experimental results to the VRH theory. (c) Schematic diagram of a BRGO-channel-based FET with silver electrodes. (d) ID-VG characteristics of the BRGO-channel-based FET (VDS = 2 V).
(a) Schematic diagram of a graphene-channel-based FET with S and D electrodes made of BRGO. (b) SEM and digital images (inset) of the BRGO film deposited on CVD graphene. (c) I-V characteristics of a CVD graphene device with GO, BRGO, and silver electrodes. (d) ID-VG characteristics of the graphene FET with S and D electrodes made of GO, BRGO, and silver (VDS = 2 V).
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