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A02 Masaaki Haga

Masa-aki Haga

Participating A02

Affiliation

Faculty of Applied Chemistry, Chuo University

Position

Professor

Contact

mhaga@kc.chuo-u.ac.jp

HP

http://www.chem.chuo-u.ac.jp/~iimc/

Research Project

Development of Molecular Memristor Devices by Heterojunction Based on Metal Complexes

Abstract

We will construct surface heterojunction structures based on coordination network films and a proton conduction polymer toward molecular memristor devices.  Since the heterojunction possesses surface asymmetric nanostructure, proton gradient by pKa values and potential gradient are introduced at the interface between two molecular component units. We have fabricated the coordination asymmetric heterolayer films by use of coordination bond between phosphonate groups on an ITO electrode. We will focus on the following subjects: (1) memoristor behavior of heterojunction composed of two different materials such as proton conducting metal-organic frameworks and metal oxides.  We will also investigate how the rectification at the heterojunction by energy gap affects the proton-conduction between two coordination network film with different pKa values.  (2) Photo charge storage devices on the hetero-junction films based on the luminescent Ru complex. (3) K+ ion gating on Prussian blue nanocrystals on an ITO modified with redox-active Ru complex.

Research Areas

Surface coordination chemistry, Molecular device, Hetero-junction, Layer-by-layer films

Keywords

Redox-active complexes. Layer-by-layer growth, Memristor, Charge storage, electrochemistry, two-terminal device

2018

[11] 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.
[10] 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.
[9] 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.
[8] 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.
[7] Bio-inspired Protonic Memristor Devices Based on Metal Complexes with Proton-Coupled Electron Transfer,
Yusuke Hiruma; Kai Yoshikawa; Masa-aki Haga, Farady Discussions, , 2018
DOI: 10.1039/C8FD00098K.

2017

[6] 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.
[5] 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.
[4] 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.
[3] 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.
[2] 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.
[1] pH Controllable Photocurrent Switching and Molecular Half-Subtractor Calculations Based on a Monolayer Momposite Film of a Dinuclear RuII 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.