The synthesis and photoelectric study of 6,13-bis(4-propylphenyl)pentacene, and its TiO2 nano-sized composite films

The synthesized 6,13-bis(4-propylphenyl)pentacene(BPP) is much more soluble and stable than pentacene. The introduction of 4-propylphenyl group leads the solubility to 7.33 mg/mL in CHCl3. In cyclic voltammetry (CV) test, it was found that its forbidden band gap is 1.88 eV. Moreover, a series of BPP–TiO2 composites were constructed. Characterizations proved that an interaction between BPP and TiO2 has probably occurred, leading to the generation of some novel properties. The most interesting result is that the forbidden band gaps of the composite materials are much smaller than that of BPP and TiO2.