2021 Fiscal Year Research-status Report
水中ラジカル反応を利用した新たな手法による光機能性金属酸化物ナノ構造の作製
| Project/Area Number |
21K04823
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| Research Institution | Hokkaido University |
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Principal Investigator |
張 麗華 北海道大学, 工学研究院, 准教授 (60719714)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | metal oxides / radical reactions / photofunction / nano structure / copper / molybdenum / tungsten / hydrogen peroxide |
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| Outline of Annual Research Achievements |
In this work, we developed a submerged radical reactions method for the fabrication of metal nano oxides for photo functional applications. The radical reactions were generated by light illumination (UV, and visible light), ultrasound, and reactive oxygen species, and this method was applied for copper, tungsten, and molybdenum oxides nanoparticles fabrication. The solution of H2O2, HClO, and H2O2-HClO mixture were used as reaction oxygen species.
The fabricated oxides were analyzed by XRD, SEM-EDS, TEM, and XPS. The specific surface area of the obtained particles was evaluated by BET analysis. Both H2O2 and H2O2-HClO mixture solution under UV illumination could successfully generate molybdenum oxides and tungsten oxides. The H2O2 solution concentration could affect the crystal structures and the morphologies of the products. For copper oxide, HClO solution could fabricate nanorod bundles oxides. The effect of light and temperature during the process was also analyzed. In addition, the reaction mechanism was considered thermodynamically.
The special morphologies of the fabricated oxides indicate the potential photo functional applications, which will be evaluated by electrochemical experiments.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The reactive oxygen species (ROS) of H2O2 and HClO were successfully applied for the fabrication of Cu, Mo, W oxides.
For tungsten and molybdenum oxides, H2O2 and UV illumination could affect the crystal structures and morphologies greatly.
For copper oxides, the ratio of H2O2 and HClO, the wavelength of the light (UV, visible light) also show great effect on the product morphologies.
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| Strategy for Future Research Activity |
(1) Morphologies control by light and ROS concentration
(2) Reaction mechanism analysis
(3) Electrochemical experiments on the fabricated oxides
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| Remarks |
北海道大学ＨＰにプレスリリースされました
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