A02 芳賀正明　　

芳賀正明		公募　A02
所　属	中央大学研究開発機構
役　職	客員教授
連絡先	mhaga@kc.chuo-u.ac.jp
研究室HP	http://www.chem.chuo-u.ac.jp/~iimc/
研究課題	分子ヘテロ接合を利用した分子メモリスタの創製
研究内容	表面での集積アシンメトリーとして、表面での分子ヘテロ接合面にポテンシャル勾配およびpKa差をもつ錯体あるいは酸化物を導入して、電子とプロトンの伝導の差を利用した分子メモリスタの創製を目指している。これまでに、レドックス電位およびpKa差をもつ２種のRu錯体とプロトン伝導性高分子を挟み込んだ二端子系がメモリスタ機能を示すことがわかった。そこで、本研究では（１）錯体と高分子界面でのプロトン勾配によるプロトン伝導がどのように媒介されるかを、湿度や膜厚などの影響を精査する。また、（2）プロトン伝導チャネルが形成可能なブロック共重合体のナノアレイパターン構造の利用を検討する。（3）新たにプロトン伝導性をもつ無機有機構造体とプロトン共役電子移動が可能な金属錯体あるいは無機酸化物とのヘテロ接合面あるいは分子とプルシアンブルー結晶とのヘテロ接合膜でのプロトン/カリウムイオンと電子との協同移動や光応答性をもつメモリスタ機能の可能性を検討し、シナプスを模したメモリスタデバイスの創製を目指す。
専門分野	表面錯体化学、錯体光化学、分子電気化学
研究キーワード	レドックス活性錯体、表面ヘテロ接合膜、表面ネットワーク構造、プロトン伝導、メモリスタ、光蓄電デバイス

研究業績

2020

[13] Three-phase electrochemistry of a highly lipophilic neutral ru-complex having tridentate bis(benzimidazolate)pyridine ligands,
R.S.Vishwanath ; Masa-aki Haga; Takumi Watanabe; Emilia Witkowska Nery; Martin Jönsson-Niedziółka, Electrochimica Acta, 362, 137090, 2020
DOI: 10.1016/j.electacta.2020.137090.

2019

[12] Electrochemical Interfacing of Prussian Blue Nanocrystals with an ITO Electrode Modified with a Thin Film Containing a Ru Complex,
Hiroaki Sato; Mitsutoshi Ide; Ryo Saito; Takanari Togashi; Katsuhiko Kanaizuka; Masato Kurihara; Hiroshi Nishihara; Hiroaki Ozawa; Masa‐aki Haga, J. Mater. Chem. C, 7, 12491 – 12501, 2019
DOI: 10.1039/c9tc04192c.

2018

[11] Wisely Designed Phthalocyanine Derivative for Convenient Molecular Fabrication on a Substrate,
Wataru Harada; Mana Hirahara; Takanari Togashi; Manabu Ishizaki; Masato Kurihara; Masa-aki Haga; Katsuhiko Kanaizuka, Langmuir, 34, 4, 1321 – 1326, 2018
DOI: 10.1021/acs.langmuir.7b03466.

[10] Hydrogen-bonded metallo-supramolecular polymers based on ruthenium or iron complexes for the selective extraction of single-walled carbon nanotubes,
Shota Oka; Hiroaki Ozawa; Kai Yoshikawa; Tomiki Ikeda; Masa-aki Haga, Dalton Trans., 47, 40, 14195 – 14203, 2018
DOI: 10.1039/c8dt01573b.

[9] Proton-Rocking-Chair-Type Redox Capacitors Based on Indium Tin Oxide Electrodes with Multilayer Films Containing Ru Complexes,
Kai Yoshikawa; Daisuke Motoyama; Yusuke Hiruma; Hiroaki Ozawa; Shusaku Nagano; Masa-aki Haga, ACS Applied Materials & Interfaces, 10, 32, 26990 – 26700, 2018
DOI: 10.1021/acsami.8b05907.

[8] Robust Nanowrapping of Reduced Graphene Oxide by Metal–Organic Network Films between Fe Ions and Tetra(Catechol-Substituted) Porphyrin,
Hiroaki Ozawa; Shunsuke Kusaba; Mariko Matsunaga; Masa-aki Haga, Langmuir, 2952 – 2958, 2018
DOI: 10.1021/acs.langmuir.7b03828.

[7] Humidity-controlled rectification switching of ruthenium-complex molecular junctions,
Huseyin Atesci; Veerabhadrarao Kaliginedi; Jose A. Celis Gil; Hiroaki Ozawa; Joseph M. Thijssen; Peter Broekmann; Masa-aki Haga; Sense Jan van der Molen, Nat. Nanotechnol., 13, 117 – 121, 2018
DOI: 10.1038/s41565-017-0016-8.

2017

[6] pH Controllable Photocurrent Switching and Molecular Half-Subtractor Calculations Based on a Monolayer Momposite Film of a Dinuclear Ru^II Complex and Graphene Oxide,
Ting-Ting Meng; Li Xin Xue; Hao Wang; Ke-Zhi Wang; Masa-aki Haga, J. Mater. Chem. C, 5, 13, 3390 – 3396, 2017
DOI: 10.1039/c7tc00494j.

[5] Energy-Storage Applications for a pH Gradient between Two Benzimidazole-Ligated Ruthenium Complexes That Engage in Proton-Coupled Electron-Transfer Reactions in Solution,
Daisuke Motoyama; Kai Yoshikawa; Hiroaki Ozawa; Makoto Tadokoro; Masa-aki Haga, Inorg. Chem., 56, 11, 6419 – 6428, 2017
DOI: 10.1021/acs.inorgchem.7b00518.

[4] Stable Anchoring Chemistry for Room Temperature Charge Transport through Graphite-Molecular Contacts,
Alexander V. Rudnev; Veerabhadrarao Kaliginedi; Andrea Droghetti; Hiroaki Ozawa; Akiyoshi Kuzume; Masa-aki Haga; Peter Broekmann; Ivan Runner, Sci. Adv., 3, 6, e1602297, 2017
DOI: 10.1126/sciadv.1602297.

[3] Controlling the Molecular Direction of Dinuclear Ruthenium Complexes on HOPG Surface through Noncovalent Bonding,
Hiroaki Ozawa; Norihiko Katori; Tomomi Kita; Shota Oka; Masa-aki Haga, Langmuir, 33, 11901 – 11910, 2017
DOI: 10.1021/acs.langmuir.7b02194.

[2] Luminescent Ir(III) Complexes Bearing Benzothiazole or Benzoxazole-Based Pincer Ligand,
Junpei Kuwabara; Tomomi Namekawa; Eiko Sakabe; Masa-aki Haga; Takaki Kanbara, J. Organometal. Chem., 845, 189 – 195, 2017
DOI: 10.1016/j.jorganchem.2017.04.037.

[1] Synchronized Collective Proton-Assisted Electron Transfer in Solid State by Hydrogen-Bonding Ru(II)/Ru(III) Mixed-Valence Molecular Crystals,
Makoto Tadokoro; Hiroyuki Hosoda; Tomonori Inoue; Akira Murayama; Koichiro Noguchi; Atsushi Iioka; Ryota Nishimura; Masaki Itoh; Tomoaki Sugaya; Hajime Kamebuchi; Masa-aki Haga, Inorg. Chem., 56, 8513 – 8526, 2017
DOI: 10.1021/acs.inorgchem.7b01256.