title: Room-temperature synthesis of manganese oxide monosheets.
abstract: Preparation of single-layer manganese oxide nanosheets (monosheets) comprised of edge-shared MnO(6) octahedra has relied on multistep processing involving a high-temperature solid-state synthesis of bulk templates, and ion-exchange and exfoliation reactions in solutions, requiring high cost and long processing time. Here we demonstrate the first single-step approach to directly access the MnO(2) monosheets, by the chemical oxidation of Mn(2+) ions in the presence of tetramethylammonium cations in an aqueous solution. Of importance is that this template-free reaction readily proceeds within a day at room temperature. The ability of the MnO(2) monosheets to self-assemble allows aggregation, to form layered structures with potassium cations and cationic tetrathiafulvalene analogues as intercalants. Furthermore, Langmuir-Blodgett (LB) films composed of the MnO(2) monosheets were successfully fabricated by the LB deposition method, in which about one layer of the monosheets was deposited for each process.
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Kai
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kageyama
authors.forename: Gunzi
authors.initials: G
authors.lastname: Saito
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Ishigaki
authors.forename: Yu
authors.initials: Y
authors.lastname: Furukawa
authors.forename: Jun
authors.initials: J
authors.lastname: Kawamata