title: Preparation of Mesoporous Bimetallic Au-Pt with a Phase-Segregated Heterostructure Using Mesoporous Silica.
abstract: Mesoporous bimetallic Au-Pt with a phase-segregated heterostructure has been prepared by using mesoporous silica SBA-15 as a template. Au nanoparticles were prepared as a seed metal within the mesopores, and subsequently Pt was deposited, sandwiching the Au seeds. Energy-dispersive X-ray (EDX) spectral mapping showed that the framework of mesoporous bimetallic Au-Pt, prepared by removing the silica template with HF, was composed of Au nanoparticles joined with Pt nanowires. The Au/Pt ratio of the mesoporous bimetallic Au-Pt could be varied by controlling the number of Au deposition cycles. Pre-adsorbed CO (COad) stripping voltammetry of the mesoporous bimetallic Au-Pt showed that the surfaces of the joined bimetallic structure were electrochemically active. This could be attributed to the open framework structure having a high ratio of exposed bimetallic mesopore surfaces. The described preparative approach, involving a mesoporous silica template and stepwise deposition within the mesopores, enables control of the nanostructure of the bimetallic material, which is greatly promising for the further development of synthetic methodologies for bimetallic structures.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo 169-8555 (Japan), Fax: (+81) 3-5286-3199.
authors.forename: Masaki
authors.initials: M
authors.lastname: Kitahara
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo 169-8555 (Japan), Fax: (+81) 3-5286-3199.
authors.forename: Saori
authors.initials: S
authors.lastname: Kubara
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo 169-8555 (Japan), Fax: (+81) 3-5286-3199.
authors.forename: Azusa
authors.initials: A
authors.lastname: Takai
authors.affiliation: Materials and Chemical Engineering, Faculty of Textile Science and Technology, Shinshu University, Tokida-3, Ueda, Nagano 386-8567 (Japan).
authors.forename: Daisuke
authors.initials: D
authors.lastname: Takimoto
authors.affiliation: Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, Nishiwaseda-2, Shinjuku-ku, Tokyo 169-0051 (Japan).
authors.forename: Shinpei
authors.initials: S
authors.lastname: Enomoto
authors.affiliation: World Premier International (WPI) Research Center for Materials, Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki-1, Tsukuba, Ibaraki 305-0044 (Japan).
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yamauchi
authors.affiliation: Materials and Chemical Engineering, Faculty of Textile Science and Technology, Shinshu University, Tokida-3, Ueda, Nagano 386-8567 (Japan).
authors.forename: Wataru
authors.initials: W
authors.lastname: Sugimoto
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo 169-8555 (Japan), Fax: (+81) 3-5286-3199. kuroda@waseda.jp.|Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, Nishiwaseda-2, Shinjuku-ku, Tokyo 169-0051 (Japan). kuroda@waseda.jp.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Kuroda
keywords: cyclic voltammetry; gold; mesoporous materials; platinum; template synthesis