| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
Cu nanocolloids have attracted much attention as alternative metal to precious gold nanocolloids. However, they have a problem with stability and get oxidized easily. Thus, improvement in oxidation resistance and establishment of an eco-friendly synthesis method are desired for further applications. To solve these problems, we synthesized Cu nanocolloids from copper(II) acetate by photoreduction at room temperature in the presence of titanium oxides as a photocatalyst and kaolinite as a layered clay mineral with high gas barrier properties. In the case of titanium oxide, oxide-free copper nanocolloids with well-ordered structure were obtained. Nanocolloids film can be formed by using titanium oxide thin film, and its electric conductivity can be tuned by changing the density of the nanocolloids. On the other hand, in the case of kaolinite, we obtained metallic Cu nanodisks adsorbed on kaolinite without oxides. The nanodisks showed high oxidation resistance.
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