as reported previously (33). Dispersions of GO in water (3.7 mg/mL) were then used to make GO films on various substrates, including polyethylene terephthalate (PET), nitrocellulose membrane (with 0.4 µm pore size), aluminum foil, and regular Xerox paper, among others. GO films were made by either drop-casting or vacuum filtering GO dispersions onto substrates that were previously cut to the size of a CD/DVD media disc. The films were then allowed to dry for 24 hours under ambient conditions (Fig.…
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