Photochemical electron transfer through [corrected] the interface of hybrid films of titania nano-sheets and mono-dispersed spherical mesoporous silica particles.
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.
Yui
Tatsuto
T
Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan. ttt_yui@mac.com
Kobayashi
Yuka
Y
Yamada
Yuri
Y
Tsuchino
Takako
T
Yano
Kazuhisa
K
Kajino
Tsutomu
T
Fukushima
Yoshiaki
Y
Torimoto
Tsukasa
T
Inoue
Haruo
H
Takagi
Katsuhiko
K
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
D001672:Biocompatible Materials; D011166:Porphyrins; C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium