Fabrication of the porous graphene sponge film
This protocol is extracted from research article:
Programmable wettability on photocontrolled graphene film
Sci Adv, Sep 14, 2018; DOI: 10.1126/sciadv.aat7392

For a typical experiment, GO solution (15 mg/ml) was added to a mold (5 cm in length, 2 cm in width, and 800 μm in thickness), which was prepared with two flat glass slides separated by a rectangle shape spacer and then assembled by the coagulation bath of 5 weight % CaCl2 overnight. The fabricated GO film was subsequently treated with the chemical reduction of 40% HI at room temperature for 24 hours. The film was washed with water to remove the residual iodine and acid and freeze-dried to fabricate porous graphene sponge film.

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