▎ 摘　　要

Novel transparent conductive films were successfully fabricated by forming graphene/PEDOT:PSS nanohybrids and then spin-coating the mixture onto glass substrates. The mechanism and characterization of graphene nano sheets dispersed at various concentrations of polar solvents (isopropanol, IPA) to improve the conductivity of the nanohybrids are evaluated using scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), four-point probe sheet resistance measurements, and UV/vis spectroscopy. The results show that the conductivity of the graphene/PEDOT:PSS nanohybrids significantly improves upon addition of 50 wt.% IPA (the optimum conditions). The sheet resistance of the nanohybrids was reduced by similar to 95% from 16.6 k Omega/square by addition of 0 wt.% IPA to 0.85 k Omega/square by addition of 50 wt.% IPA, whereas the transparency still remained up to 82%. The conductivity could then be rapidly enhanced (from 0.85 k Omega/square to 0.64 k Omega/square) by a second treatment of H2SO4, with a concomitant loss of transmittance. The correlations among the roughness, hydrophilicity, conductivity, and transparency also are investigated in detail in this paper. It is anticipated that graphene/PEDOT:PSS nanohybrids can be potentially used in an electronic and biomedical platform, such as biosensors. (C) 2016 Elsevier B.V. All rights reserved.