Synthesis and assembly of gold nanoparticle-doped polymer solid foam films at the liquid/liquid interface and their catalytic properties

► Gold nanoparticle-doped foam-like P2VP film formed at the liquid/liquid interface. ► UV-light treatment led to further reduction of AuCl4- and cross-linking of P2VP. ► The self-assembly of P2VP-AuCl4- complexes resulted in the formation of the film. ► The composite films exhibited effective catalytic activity. ► Durable catalytic activity was achieved after the third cycle.