Electron microscopy investigations of the organization of cerium oxide nanocrystallites and polymers developed in polyvinylpyrrolidone-assisted polyol synthesis process |
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Authors: | Shin Horiuchi Takeshi Hanada Noriya Izu and Ichiro Matsubara |
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Institution: | (1) Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan;(2) Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98, Anagahora, Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan |
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Abstract: | The microstructures and the organization mechanism of cerium oxide (ceria) nanospheres were investigated by transmission electron
microscopy. The ceria nanospheres with the diameter of 50–150 nm were produced by the polyol synthesis method with cerium
nitrate precursor and with polyvinylpyrrolidone (PVP) used as a protecting agent. Dose-limited observations performed by energy-filtering
transmission electron microscopy revealed that the ceria nanospheres were the aggregated products consisting of ceria nanocrystallites
~3 nm in size and PVP-derived polymer products. It was found that the ceria nanocrystallites were oriented within the nanospheres
by high-resolution transmission electron microscopy and selected-area electron diffraction. Selective adsorption of PVP on
the crystal facets of the ceria nanocrystallites was suggested, and the aggregation of the PVP-adsorbed ceria through cross-linking
reaction of PVP causes the crystal orientation. |
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