The assembly and photoelectronic property of reduced graphene oxide/porphyrin/phthalocyanine composite films

Abstract

By a layer-by-layer self-assembly method, reduced graphene oxide (RGO)-based composite films with high photoelectronic activity were assembled with 5,10,15,20-tetrakis(p-N,N,N-trimethylanilinium)porphyrin tetraiodide (TAPPI) and copper sulfophthalocyanine (CuTsPc) as the co-sensitizers. The π–π interaction and electrostatic interaction were the main driving forces of the assembly. The linear dependence of the absorption on the layer numbers of the films demonstrated the formation of the ordered films. In the composite film, an efficient photoinduced electron transfer can take place as evidenced by fluorescence spectra. Furthermore, the photoelectronic response for the RGO/TAPPI/CuTsPc film was higher than that of the RGO/TAPPI film, the RGO/CuTsPc film or the TAPPI/CuTsPc film. The complementary absorption spectra of TAPPI and CuTsPc and the quick transfer of photoproduced electrons could be the main reasons for the enhanced photoelectronic response in the RGO/TAPPI/CuTsPc film.