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© The Royal Society of Chemistry 2015. Titanium dioxide (TiO<inf>2</inf>) and TiO<inf>2</inf>/Au/reduced graphene oxide (rGO) nanocomposite thin films were grown by ultraviolet matrix assisted pulsed laser evaporation (UV-MAPLE) in controlled O<inf>2</inf> or N<inf>2</inf> atmospheres. An UV KrF∗ excimer laser (λ = 248 nm, τ<inf>FWHM</inf> ∼ 25 ns, ν = 10 Hz) was used for the irradiation of the MAPLE targets consisting of TiO<inf>2</inf> nanoparticles (NPs) or mixtures of TiO<inf>2</inf> NPs, Au NPs, and graphene oxide (GO) platelets in aqueous solutions. The effect of Au and GO addition as well as nitrogen doping on the photocatalytic activity of the TiO<inf>2</inf> thin films was investigated. The evaluation of the photocatalytic activity was performed by photodegradation of the organic methylene blue model dye pollutant under UV-visible light, >simulated sun> irradiation conditions. Our results show that the photocatalytic properties of TiO<inf>2</inf> were significantly improved by the addition of Au NPs and rGO platelets. Nitrogen inclusion into the rGO structure further contributes to the enhancement of the TiO<inf>2</inf>/Au/rGO nanocomposites photocatalytic activity.The authors thank the financial support of the Executive Unit for Financing Higher Education, Research, Development, and Innovation of the Romanian Ministry of Education and Scientific Research under the contract PN-IIPT-PCCA-2011-3.2-1235 and the Spanish Ministry of Economy and Competitiveness under the contract ENE2014-56109-C3-3-R.Peer reviewedPeer Reviewe

One-step preparation of nitrogen doped titanium oxide/Au/reduced graphene oxide composite thin films for photocatalytic applications