Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/ncomms4038
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Funding
- WCU (World Class University) programme through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [R31-10035]
- JSPS [P 11041]
- Innovative Project for Advanced Instruments, Renovation Center of Instruments for Science Education and Technology, Osaka University
- Ministry of Education, Culture, Sports, Science and Technology of the Japanese Government [25220806, 25810114]
- Grants-in-Aid for Scientific Research [25810114, 25288035] Funding Source: KAKEN
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The alignment of nanoparticle building blocks into ordered superstructures is one of the key topics in modern colloid and material chemistry. Metal oxide mesocrystals are superstructures of assembled nanoparticles of metal oxides and have potentially tunable electronic, optical and magnetic properties, which would be useful for applications ranging from catalysis to optoelectronics. Here we report a facile and general approach for synthesizing metal oxide mesocrystals and developing them into new nanocomposite materials containing two different metals. The surface and internal structures of the mesocrystals were fully characterized by electron microscopy techniques. Single-particle confocal fluorescence spectroscopy, electron paramagnetic resonance spectroscopy and time-resolved diffuse reflectance spectroscopy measurements revealed that efficient charge transfer occurred between n-type and p-type semiconductor nanoparticles in the composite mesocrystals. This behaviour is desirable for their applications ranging from catalysis, optoelectronics and sensing, to energy storage and conversion.
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