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ammonia (30 wt.%, Aldrich), stirred for 15 min and then treated at 100 oC for 3 h in a Teflon autoclave. Preparation of graphene aerogels (GA). In a typical procedure to obtain a GA sample, 120 mL of ROG dispersion (concentration ∼ 0.35 mg/mL) contained in a Teflon vessel was immersed in nitrogen liquid in order to ensure a rapid freezing rate. The frozen dispersion was then transferred to a lyophilizer (Telstar Cryodos) and freeze-dried at a temperature of – 51 oC and at a pressure of 0.06 mbar. In this way, a graphene aerogel (density ∼ 1 mg cm-3) was obtained. Preparation of graphene films. To prepare the graphene film, around 30 mL of aqueous ROG dispersion was vacuum filtered through a mixed cellulose ester membrane (0.22 μm pore size, 47 mm diameter, Millipore). Once the filtration was completed (after ∼ 20 min), the solvated film was immediately immersed in water where it was stored. To obtain a dry graphene film (graphene paper), the solvated film was transferred to ethanol for several hours and then it was placed on a glass surface where it was left to dry at room temperature. Material Characterization: Scanning electron microscopy (SEM) images were obtained on a Quanta FEG650 (FEI) instrument, whereas transmission electron microscopy (TEM) images were recorded on a JEOL (JEM 2100-F) apparatus operating at 200 kV. X-ray diffraction (XRD) patterns were obtained on a Siemens D5000 instrument operating at 40 kV and 20 mA, using Cu KR radiation. The Raman spectra were recorded on a Horiva (LabRam HR-800) spectrometer. The source of radiation was a laser operating at a wavelength of 514 nm and at a power of 25 mW. X-ray photoelectron spectroscopy (XPS) was 18PDF Image | Graphene from Electrochemically Exfoliated Graphite
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