title: Photoresponsive Nanosheets of Polyoxometalates Formed by Controlled Self-Assembly Pathways.
abstract: Anionic Keggin polyoxometalates (POMs) and ether linkage-enriched ammonium ions spontaneously self-assemble into rectangular ultrathin nanosheets in aqueous media. The structural flexibility of the cation is essential to form oriented nanosheets; as demonstrated by single-crystal X-ray diffraction measurements. The difference in initial conditions exerts significant influence on selecting for self-assembly pathways in the energy landscape. Photoillumination of the POM sheets in pure water causes dissolution of reduced POMs, which allowed site-specific etching of nanosheets using laser scanning microscopy. By contrast, photoetching was suppressed in aqueous AgNO3and site-selective deposition of silver nanoparticles occurred as a consequence of electron transfer from the photoreduced POMs to Ag+ions on the nanosheet surface.
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Keita
authors.initials: K
authors.lastname: Ishiba
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Takao
authors.initials: T
authors.lastname: Noguchi
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.|Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Iguchi
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Masa-Aki
authors.initials: MA
authors.lastname: Morikawa
authors.affiliation: Department of Materials Science and Engineering, Kyushu University, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Kaneko
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Nobuo
authors.identifier: 0000-0001-8527-151X
authors.initials: N
authors.lastname: Kimizuka
keywords: nanosheets; photoreduction; polyoxometalates; self-assembly