title: Indirect optical transitions in hybrid spheres with alternating layers of titania and graphene oxide nanosheets.
abstract: In this report, we studied the optical properties of hybrid spherical structures consisting of alternating nanosheets of titania (TiO(2)) and graphene oxide (GO) prepared by a layer-by-layer self-assembly technique. Compared to samples with only TiO(2) spheres or GO nanosheets, a blue-to-red light emission band emerges and persists in this novel composite material even after it was further reduced through microwave irradiation. From detailed time-resolved measurements and energy-level structure modeling, this unexpected fluorescent feature was attributed to the indirect optical transitions between TiO(2) and the localized sp(2) domains of GO in a charge-separated configuration.
authors.affiliation: National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Bao
authors.forename: Zheng
authors.initials: Z
authors.lastname: Hua
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Chunfeng
authors.initials: C
authors.lastname: Zhang
authors.forename: Wenguang
authors.initials: W
authors.lastname: Tu
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Zou
authors.forename: Min
authors.initials: M
authors.lastname: Xiao
mesh_terms: D003198:Computer Simulation; D006108:Graphite / Q000737:chemistry*; D008027:Light; D008567:Membranes, Artificial; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D010087:Oxides / Q000737:chemistry; D010316:Particle Size; D012542:Scattering, Radiation; D014025:Titanium / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D010087:Oxides; C009495:titanium dioxide; D006108:Graphite; D014025:Titanium