TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The composition comprises graphene sheets. Preferred Components: The graphene sheets have a surface area of at least about 300 (preferably at least about 400, especially at least about 500) m2/g. The graphene sheets have a carbon to oxygen molar ratio of at least about 25:1 (preferably at least about 75:1). Preferred Method: In the method, the crosslinked graphene sheets and/or graphite oxide are reduced. In the method, a coating comprising graphene sheets and/or graphite oxide is applied to a substrate and the graphene sheets and/or graphite oxide are crosslinked. The graphene sheets and/or graphite oxide are combined with at least one crosslinking agent and crosslinked, where the crosslinking agent is radical initiator (preferably peroxide, especially dicumyl peroxide and/or dibenzoyl peroxide). The graphene sheets and/or graphite oxide are combined with at least one crosslinking agent and crosslinked to form a film. The graphene sheets and/or graphite oxide have a carbon to oxygen molar ratio of at least about 10:1. EXAMPLE - Preparation of test sample was carried out as follows: coatings comprising liquid dispersions of graphene sheets were printed onto either a silicone rubber or poly(ethylene terephthalate) substrate using a wire rod. The printed substrates were placed wet in an oven at 135 degrees C and cured for 1 hour. The printed films had a thickness of about 1 mu m. Electrical conductivity was determined using a four-point probe method. The coatings were prepared as follows: graphene sheets having approximate carbon to oxygen molar ratio of 130:1 was ground in isopropyl alcohol (IPA) in a vertical ball mill for about six hours using stainless steel balls and then for about six hours at about 20-25 degrees C in horizontal grinding mill using 0.3 mm of 5% yttrium stabilized zirconium oxide grinding media. The resulting dispersion had a solids concentration of about 6 wt.%. In the case of test sample, dicumyl peroxide (in a 1:1 ratio by weight based on the graphene sheets), was added to the dispersion and the resulting mixture was blended in a high shear mixer operating at about 33000 RPM for about three minutes whereas for control sample no dicumyl peroxide was used. The test/control sample was evaluated for electrical conductivity on silicone rubber and on PET. The results for test/control sample were: electrical conductivity on silicone rubber (S/cm) = 38/11; and electrical conductivity on PET (S/cm) = 99/9.