title: Surface plasmon fluorescence investigation of energy-transfer-controllable organic thin films.
abstract: Thin functional organic films on a gold substrate were fabricated by adsorbing tetrakis(carboxyphenyl)porphyrin (TCPP) on a spacer layer, which was prepared by the layer-by-layer adsorption of a dendrimer and a linear polymer. The thickness and photoluminescence of the films were investigated by surface plasmon resonance and surface plasmon fluorescence techniques, respectively. TCPP adsorbed on the spacer layer in aqueous solutions of different ionic strengths resulted in a thick TCPP adlayer at high ionic strength and a shrunk spacer layer at low ionic strength. The fluorescence was quenched at high ionic strength but could be observed at low ionic strength. The effects are explained by the states of dye aggregation. This study shows the control of energy transfer from a metal surface to a dye layer by changing the dye adlayer. It can contribute to the development of molecular devices involving energy-transfer systems.
authors.affiliation: Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Mitamura
authors.forename: Toyoko
authors.initials: T
authors.lastname: Imae
authors.forename: Senjun
authors.initials: S
authors.lastname: Tian
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Knoll
mesh_terms: D000327:Adsorption; D050091:Dendrimers / Q000737:chemistry; D004735:Energy Transfer; D006046:Gold / Q000737:chemistry; D049449:Luminescence; D008567:Membranes, Artificial; D009994:Osmolar Concentration; D011145:Polyvinyls / Q000737:chemistry; D011166:Porphyrins / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods; D013451:Sulfonic Acids / Q000737:chemistry; D020349:Surface Plasmon Resonance / Q000379:methods*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D050091:Dendrimers; D008567:Membranes, Artificial; D011145:Polyvinyls; D011166:Porphyrins; D012996:Solutions; D013451:Sulfonic Acids; D014867:Water; C018395:tetracarboxyphenylporphine; C008959:lyapolate; D006046:Gold