Outcome：

2024
Bilayer graphene was synthesized using graphene oxide. Optimization of substrate structure, spin-coating conditions, and reduction conditions were explored. These surface structures were mainly analyzed using AFM.

2023
The frictional properties of conductive reduced graphene oxide were studied at an nano level. We found that the reduction decreases the oxygen functional groups, which in turn decreases the frictional force.

2022
In this research article, we report a method to fabricate conducting reduced graphene oxide (rGO) monolayer films reduced by methane plasma treatment within few minutes and the nanoscale characterization of local conductivity via conductive atomic force microscopy (C-AFM), realizing their applicability in highly transparent conducting electrodes.

Graphene is a monolayer of carbon with excellent electrical, thermal, and mechanical properties. However, since single-layer graphene is a zero-gap semiconductor, it must be processed into nanoribbons or other forms to create a gap. Carbon nanotubes, on the other hand, have a high aspect ratio and large surface area, making them suitable for battery electrodes.

Outcome：

2024
We fabricated an enhanced probe with high reproducibility by coating the tip of the probe with silver and gold for plasmon excitation followed by FIB processing. Using this method, we succeeded in operating with the non-gap mode.

流線形の機械は流体抵抗を下げるマクロな構造であるが、表面にサメ肌状リブレット構造を用意すると、抵抗を更に低減できることが知られる。立体フォトリソグラフィ技術により、ミクロな意中の構造を広域に作れるようになった。各種マイクロテクスチャーを立体機械部品に作り、抵抗・摩擦低減、伝熱促進、放射制御、抗菌などの様々な新機能を省スペースで実現する。

Outcome：

2023
マイクロテクスチャーを付与することで、抗菌パターンをロールに用意し、量産に適した圧延技術で部材に転写できた。赤外線サブ波長サイズのモスアイ構造を、凹レンズ金型に実現し反射防止構造を実現した。

2024
マイクロテクスチャーを付与することで、ステンレス部品からの赤外線の放射制御、銅部品の伝熱促進を確認した。また、熱交換機フィン用アルミ合金の薄板材にハスの葉状凹凸を付けることで撥水性を高めた。部品穴の内面に、摩擦を低減構造を実現した。また、シリコン部材に微細な柱アレイを創り、表面積を増やしつつ電池化学反応に伴う体積膨張を許容する電極を実現した。

An electrochemical cell for infrared spectroscopy is desined and combined with a commercial infrared spectrometer to directly observe adsorbates on an electrode catalysts under various potential during the reaction.

Outcome：

2023
Graphite electrodes loaded with Ag nanoparticles were characterized for the electrolytic reduction reaction of carbon dioxide. Electrochemical AFM analysis revealed that the adsorption force between the graphite substrate and Ag particles is weakened by the hydrogen evolution reaction, with a side reaction of the carbon dioxide reduction reaction, resulting in desorption and aggregation of the Ag nanoparticles supported on the electrode.

2022
An electrochemical infrared spectroscopy cell was fabricated and combined with an infrared spectrometer to measure the adsorption behavior of water molecules on a water electrolysis catalyst using an attenuated total reflection setup. The adsorption behavior of water molecules is depended on the support materials of catalysts.

To develop Ag-modified electrocatalysts for the production of carbon monoxide by the electrochemical reduction of carbon dioxide, we elucidate the effects of Ag particle size and support conditions on the catalytic activity and durability to establish a synthesis method for highly active electrocatalysts.

Outcome：

2022
Ag nanoparticles deposited on graphite electrodes were characterized for the electrochemical reduction reaction of carbon dioxide. The hydrogen evolution reaction, a side reaction of the carbon dioxide reduction reaction, causes desorption and aggregation of the Ag nanoparticles on the electrode.

A novel electrode material for Li-ion capacitors (LICs) with high capacity and fast charge-discharge response is fabricated by using vertically aligned carbon nanotubes (CNTs) grown directly on a substrate electrode (carbon, Al or Cu) and its performance is evaluated. The CNTs-modified electrodes are synthesized by alcohol catalyzed chemical vapor deposition (AC-CVD). The performance of the CNT-modified electrodes are evaluated in aqueous solution or organic solvent.

Outcome：

2022
To improve the charge-discharge capacity of vertically aligned carbon nanotube-modified electrodes, a multi-step synthesis method was developed to increase CNT growth length. The multi-step synthesis method provided 3 times longer CNTs, and the capacity was improved on the electrode modified with these CNTs.

For the development of polymer electrolyte water electrolyzer (PEWE), the synthesis of an anode catalyst with low overvoltage and high stability are important. We aim to develop iridium oxide and its alloy nanoparticle catalysts uniformly dispersed and supported on a highly conductive nanocarbon material.

Outcome：

2022
Catalyts performance of IrO2 supported on B- and N-doped graphene was evaluated in a polymer electrolyte water electrolyzer. We clarified that IrO2/BN-doped graphene has high activity and durablity for the oxygen evolution reaction (OER).

To develop new anode electrocatalysts with highly active and selectivefor direct-type fuel cells using hydrogen carrier molecules (quinones, and glucose), the control of the elements of the nanoparticles, the size and surface structure of the catalyst, and the support material are important. We will develop and evaluate non-metallic catalysts suitable for hydrogen carrier molecules with aromatic ring structure.

Outcome：

2022
The oxidation behavior of quinones used in direct-type fuel cells were evaluated on heteroatom-doped graphene catalysts. Boron-doped graphene has enhanced the catalytic activity for quinon-ased fuels