| 1.Research Institution | Osaka University | |
| 2.Research Area | Physical and Engineering Sciences | |
| 3.Research Field | Advanced Processes | |
| 4.Term of Project | FY1996〜FY2000 | |
| 5.Project Number | 96P00305 | |
| 6.Title of Project | Materials Synthesis with Atom Clusters |
| Name | Institution,Department | Title of Position |
| Mori, Hirotaro | Osaka University, Res. Ctr. UHVEM | Professor |
8.Core Members
| Names | Institution,Department | Title of Position |
| Yanagida, Shozo | Osaka University, Graduate School of Engineering | Professor |
| Hayashi, Shinji | Kobe University, Faculty of Engineering | Professor |
| Yamamoto, Keiichi | Kobe University, Faculty of Engineering | Professor |
9.Cooperating Researchers
| Names | Institution,Department | Title of Position |
| Wada, Yuji | Osaka University, Graduate School of Engineering | Associate Prof. |
| Yasuda, Hidehiro | Osaka University, Res. Ctr. UHVEM | Assistant |
10.Summary of Research Results
|
It is well known that atom clusters consisting of 103〜104 atoms often exhibit properties and structures that are quite different from those of the corresponding bulk materials. Based upon this premise, in the present project, studies on materials synthesis with atom clusters have been carried out. The results obtained can be summarized as follows. 1. It is found that GaSb crystals can be rendered amorphous by MeV electron irradiation. It is also confirmed that such heavy atoms as lead and gold can be implanted into the Al matrix by MeV electron irrandiation. 2. It is confirmed that spontaneous alloying in atom clusters takes place in a variety of binary alloy systems and therefore is a phenomenon of wide generality. It is revealed that the phase equilibrium in nanometer-sized atom clusters is quite different from that in bulk materials. 3. ZnS and CdS nanoclusters have been successfully prepared and stabilized in DMF. It is confirmed that the nanoclusters catalyzed selective photoreduction of CO2. 4. Porous TiO2 films with narrow pore-size distribution and high optical transmittance have been successfully prepared using 2 kinds of titanium dioxide nanoclusters. Sollar cells made of the mesoporous films (as photoanodes) achieved a better photo-energy conversion efficiency as compared to those prepared from commercially available films. 5. Cubic nano-sized clusters of Ni have been successfully prepared by microwave irradiation. The average size of the clusters can be controlled between 5-8 nm by changing the irradiation condition. 6. High efficiency near-IR emission of Nd (III) has been achieved by ligating it with bis (per fluoromethylsulfonyl)-aminate in cages of a nanocrystalline, large-pore zeolite. The quantum yield for the emission was (9.5±1.0)×10-2 under excitation at 585 nm. This is the highest value ever observed for Nd (III) emission in organic media. 7. Nanoclusters of Si and Ge have been successfully prepared and embedded in the SiO2 matrix by a cosputtering method followed by annealing treatments. An impurity-doping technique to these nanoclusters is also established. |
11.Key Words
(1)Atom Cluster、(2)Alloying、(3)Phase Equilibrium
(4)Microwave Irradiation、(5)Sollar Cell、(6)Photoluminescence
12.References
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