title: Metal permeation into multi-layered graphene oxide.
abstract: Understanding the chemical and physical properties of metal/graphene oxide (M/GO) interfaces is important when GO is used in electronic and electrochemical devices because the metal layer must be firmly attached to GO. Here, permeation of metal from the surface into GO paper bulk at the M/GO interface was observed at room temperature for metals such as Cu, Ag, Ni, Au, and Pt. Cu, Ag, and Ni quickly permeated GO as ions into the bulk under humid conditions. At first, these metals changed to hydrated ions as a result of redox reactions (with reduction of GO) at the surface, and then permeated the interlayers. Au and Pt were observed to permeate GO as atoms into the GO bulk at room temperature, although the permeation rates were low. These surprising results are considered to be due to the presence of many defects and/or edges with oxygenated groups in the GO paper.
authors.affiliation: 1] Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan [2] JST, CREST, K's Gobancho 6F, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan.
authors.forename: Chikako
authors.initials: C
authors.lastname: Ogata
authors.affiliation: 1] Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan [2] JST, CREST, K's Gobancho 6F, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan.
authors.forename: Michio
authors.initials: M
authors.lastname: Koinuma
authors.affiliation: 1] Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan [2] JST, CREST, K's Gobancho 6F, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan.
authors.forename: Kazuto
authors.initials: K
authors.lastname: Hatakeyama
authors.affiliation: 1] Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan [2] JST, CREST, K's Gobancho 6F, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan.
authors.forename: Hikaru
authors.initials: H
authors.lastname: Tateishi
authors.affiliation: 1] Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan [2] Materials Science Groups and Laboratory, Deparment of Physics, Sepuluh Nopember Institute of Technology, Surabaya 60111, Indonesia.
authors.forename: Mohamad Zainul
authors.initials: MZ
authors.lastname: Asrori
authors.affiliation: 1] Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan [2] JST, CREST, K's Gobancho 6F, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan.
authors.forename: Takaaki
authors.initials: T
authors.lastname: Taniguchi
authors.affiliation: 1] Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan [2] JST, CREST, K's Gobancho 6F, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan.
authors.forename: Asami
authors.initials: A
authors.lastname: Funatsu
authors.affiliation: 1] Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan [2] JST, CREST, K's Gobancho 6F, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan.
authors.forename: Yasumichi
authors.initials: Y
authors.lastname: Matsumoto