title: Photochemical electron transfer through [corrected] the interface of hybrid films of titania nano-sheets and mono-dispersed spherical mesoporous silica particles.
abstract: Photochemical Electron Transfer (ET) between an organic dye, the porphyrin derivative TMPyP, and an electron acceptor, methyl viologen MV2+, have been investigated at the interface of two different inorganic films, i.e., layered titania nano-sheets (TNS) and a monolayer film of spherical and mono-dispersed mesoporous silica (sMPS) particles (ca. 0.5 microm). TMPyP ions were intercalated within the sMPS nano-cavities to form (TMPyP-sMPS) while MV2+ ions were intercalated into the TNS interlayers to form (MV2+-TNS). The (TMPyP-sMPS) and (MV2+-TNS) films were then stacked on a silica substrate in this order to form a (MV2+-TNS)/(TMPyP-sMPS) film and, upon UV light irradiation, ET could be induced. However, when this film was stacked inversely, i.e., for the (TMPyP-sMPS)/(MV2+-TNS) films on a silica substrate, no photoinduced ET were observed. Interestingly, however, even for this photo-inactive inversely stacked film, ET could be generated by inserting a gold vapor-deposited layer between the (MV2+-TNS) and (TMPyP-sMPS) films. The conjugation conditions at the interface of the inversely stacked (TMPyP-sMPS)/(MV2+-TNS) hybrid film were, thus, confirmed to strongly affect the photoinduced electron transfers and their efficiencies.
authors.affiliation: Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan. ttt_yui@mac.com
authors.forename: Tatsuto
authors.initials: T
authors.lastname: Yui
authors.forename: Yuka
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Yuri
authors.initials: Y
authors.lastname: Yamada
authors.forename: Takako
authors.initials: T
authors.lastname: Tsuchino
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Yano
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Kajino
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Fukushima
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Torimoto
authors.forename: Haruo
authors.initials: H
authors.lastname: Inoue
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Takagi
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004583:Electrons; D008027:Light; D008956:Models, Chemical; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011166:Porphyrins / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D001672:Biocompatible Materials; D011166:Porphyrins; C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium