Preparation of functional metal nanoparticles embedded mullite composite powders by solid solution reduction
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概要
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The mullite composite powders with embedded Fe and Ge nanoparticles were individually prepared through the reduction of Al5.4Fe0.6Si2O13 and Al12Si3.75Ge0.25O26 solid solution. The complete reduction of Fe3+ cation in solid solution is realized by hydrogen at 1200°C for 1 h. The magnetic properties of composite powders such as hysteresis loops and magnetization versus temperature were measured using SQUID. The Fe nanoparticles with the particle size around 10 nm embedded in mullite grain show the superparamagnetic behavior with the blocking temperature around 50 K. The mullite composite powders with Ge nanoparticles have strong room temperature photoluminescence (PL) at 561, 610, 676, 713 and 787 nm, respectively. The highest photoluminescence intensity was observed in the sample reduced at 500°C for 3 h. Based on the analysis of XPS and Raman spectra, it is clear that the PL phenomenon is derived from the formation of embedded Ge clusters with the average size of around 1-2 nm in mullite composite powders. It is proved that the multi-functional mullite nanocomposites with functional metal nanoparticles can be prepared through the selective reduction of designed solid solutions.
- 2009-04-01
著者
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WANG Hao
State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Tec
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GAO Le
State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Tec
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WANG Weimin
State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Tec
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FU Zhengyi
State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Tec
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SEKINO Tohru
The Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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LEE Soo
Department of Environmental Engineering, Sun Moon University
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NIIHARA Koichi
Extreme Energy-Density Research Institute, Nagaoka University of Technology
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Wang H
Peking Univ. Beijing Chn
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Wang Hao
中華人民共和国
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Wang Hao
State Key Lab Of Advanced Technology For Materials Synthesis And Processing Wuhan University Of Tech
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Fu Zhengyi
State Key Lab Of Advanced Technology For Materials Synthesis And Processing Wuhan University Of Tech
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Wang Weimin
State Key Lab Of Advanced Technology For Materials Synthesis And Processing Wuhan University Of Tech
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Sekino T
Osaka Univ. Osaka
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Sekino Tohru
The Inst. Of Multidisciplinary Res. For Advanced Materials Tohoku Univ.
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Sekino Tohru
The Institute Of Scientific And Industrial Research Osaka University
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Niihara K
Osaka Univ. Osaka Jpn
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Niihara Koichi
Extreme Energy-density Res. Inst. Nagaoka Univ. Of Technol.
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Nihara K
The Institute Of Scientific And Industrial Research Osaka University
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Gao Le
State Key Lab Of Advanced Technology For Materials Synthesis And Processing Wuhan University Of Tech
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Lee Soo
Department Of Chemistry (bk21) And Research Institute Of Natural Science Gyeongsang National Univers
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Wang Hao
Dep. Of Natural Medicinal Chemistry China Pharmaceutical Univ.
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Wang H
Department Of Natural Medicinal Chemistry China Pharmaceutical University
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Lee Soo
Department Of Agricultural Chemistry The University Of Tokyo
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Lee Soo
Department Of Environmental Engineering Sun Moon University
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