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タイトルElectrodeposition of layered manganese oxide nanocomposites intercalated with strong and weak polyelectrolytes
作成者Nakayama, Masaharu
Tagashira, Hiroki
作成者ヨミナカヤマ, マサハル
タガシラ, ヒロキ
作成者別表記中山, 雅晴
作成者所属山口大学大学院理工学研究科(工学)
内容記述(抄録等)Multilayered manganese oxide nanocomposites intercalated with strong (poly(diallyldimethylammonium) chloride, PDDA) and weak (poly(allylamine hydrochloride), PAH) polyelectrolytes can be produced on polycrystalline platinum electrode in a thin film form by a simple, one-step electrochemical route. The process involves a potentiostatic oxidation of aqueous Mn^<2+> ions at around +1.0 V (vs Ag/AgCl) in the presence of polyelectrolytes. Fully charged PDDA polycations are accommodated tightly in the interlayer space by electrostatic interaction with negative charges on the manganese oxide layers, leading to an interlayer distance of 0.97 nm. The layered film prepared with PAH has a larger polymer content (PAH/Mn molar ratio of 0.98) than that (PDDA/Mn molar ratio of 0.43) made with PDDA because of the smaller charging degree of PAH, exhibiting a larger interlayer distance (1.19 nm). The interlayer PAH contains neutral (-NH_2) and positively charged (-NH_3^+) amine groups, and the -NH_3^+ groups are associated with Cl^- (to generate -NH_3^+Cl^- ion pairs) as well as the negatively charged manganese oxide layers. Both polyelectrolytes once incorporated were not ion exchanged with small cations in solution. The layered structure of PDDA/MnO_x was collapsed during the reduction process in a KCl electrolyte solution, accompanying an expansion of the interlayer as a result of incorporation of K^+ ions for charge neutrality. On the contrary, the layered PAH/MnO_x film showed a good electrochemical response due to the redox reaction of Mn^<3+>/Mn^<4+> couple with no change in the structure. X-ray photoelectron spectroscopy revealed that, in this case, excess negative charges generated on the manganese oxide layers upon reduction can be balanced by the protons being released from the -NH_3^+Cl^- sites in the interlayer PAH; the Cl^- anions becoming unnecessary are inevitably excluded from the interlayer, and vice versa upon oxidation.
本文言語eng
資料タイプtext
出版者American Chemical Society
NII資料タイプ学術雑誌論文
査読の有無査読あり
ISSN0743-7463
NCIDAA10461730
掲載誌名Langmuir : the ACS journal of surfaces and colloids
22
8
開始ページ3864
終了ページ3869
発行日2006-04
DOIinfo:doi/10.1021/la053072i
関連情報URL(IsPartOf)http://pubs.acs.org/journals/langd5/index.html
著者版/出版社版その他
リポジトリID2008010090
地域区分山口大学
URIhttp://www.lib.yamaguchi-u.ac.jp/yunoca/handle/2008010090