title: Plasmon-enhanced photocurrent generation from self-assembled monolayers of phthalocyanine by using gold nanoparticle films.
abstract: The effect of localized electric fields on the photocurrent responses of phthalocyanine that was self-assembled on a gold nanoparticle film was investigated by comparing the conventional and the total internal reflection (TIR) experimental systems. In the case of photocurrent measurements, self-assembled monolayers (SAMs) of a thiol derivative of palladium phthalocyanine (PdPc) were prepared on the surface of gold-nanoparticle film that was fixed on the surface of indium-tin-oxide (ITO) substrate via a polyion (PdPc/AuP/polyion/ITO) or on the ITO surface (PdPc/ITO). Photocurrent action spectra from the two samples were compared by using the conventional spectrometer, and were found that PdPc/AuP/polyion/ITO gave considerably larger photocurrent signals than PdPc/ITO under the identical concentration of PdPc. In the case of the TIR experiments for the PdPc/AuP/polyion/ITO and the PdPc/AuP/Glass systems, incident-angle profiles of photocurrent and emission signals were correlated with each other, and they were different from that of the PdPc/ITO system. Accordingly, it was demonstrated that the photocurrent signals were certainly enhanced by the localized electric fields of the gold-nanoparticle film.
authors.affiliation: Department of Materials Physics and Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Sugawa
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Akiyama
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kawazumi
authors.forename: Sunao
authors.initials: S
authors.lastname: Yamada
mesh_terms: D003102:Colloids / Q000737:chemistry; D004867:Equipment Design; D006046:Gold / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D007477:Ions; D054833:Isoindoles; D008027:Light; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D010777:Photochemistry / Q000379:methods; D013055:Spectrophotometry, Infrared / Q000379:methods; D013499:Surface Properties; D017971:Tin Compounds / Q000737:chemistry
chemical_list: D003102:Colloids; D007211:Indoles; D007477:Ions; D054833:Isoindoles; D017971:Tin Compounds; C109984:indium tin oxide; D006046:Gold; C013647:phthalocyanine