▎ 摘　　要

Fifteen-layered graphene films have been successfully deposited onto flexible substrates using a commercial ink consisting of graphene particles dispersed in an acrylic polymer binder. A value of 74.9 x 10(5) cm(-2) was obtained for the density of defects, primarily located at the flake edges, from the ratio of the D and G Raman peaks located at 1345 cm(-1) and 1575 cm(-1) respectively. 0.5 mu m thick drop-cast films on interdigitated silver electrodes exhibited Ohmic conduction with a small activation energy of 12 meV over the temperature range from 260 to 330 K. The photo-thermoelectric effect is believed to be responsible for photoconduction through graphene films under illumination intensity of 10 mW m(-2) at 270 nm, corresponding to the UV absorption peak. The photo-transient decay at the bias of 1 V involves two relaxation processes when the illumination is switched off and values of 8.9 x 10(3) and 4.3 x 10(4) s are found for the relaxation time constant using the Kohlrauch stretched exponential function analysis.