▎ 摘　　要

High-quality concentrated pristine graphene (PG) dispersions were conveniently prepared by an organic salt-assisted exfoliation method. Applications of this PG product can be directly done with these stable surfactant-free graphene dispersions. Transparent graphene thin films made by drop-casting PG dispersions on glass slide and dried at 70 degrees C in air and further treated by thermal annealing in Nitrogen atmosphere exhibited very low sheet resistance (124 Omega/square) and high conductivity up to ca. 50,000 S/m. The potential utility of this massively and easily obtained PG was further demonstrated by using them as excellent conductive substrate supporting palladium nanoparticles for electro-oxidation of alcohol in NaOH solution. (C) 2014 Elsevier B.V. All rights reserved.