The Structural Fate of Individual Multicomponent Metal-Oxide Nanoparticles in Polymer Nanoreactors |
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Authors: | Jingshan S Du Peng-Cheng Chen Dr Brian Meckes Dr Zhuang Xie Jinghan Zhu Yuan Liu Prof Vinayak P Dravid Prof Chad A Mirkin |
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Institution: | 1. Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208 USA;2. Department of Chemistry, Northwestern University, Evanston, IL 60208 USA;3. Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208 USA
International Institute for Nanotechnology, Northwestern University, Evanston, IL, 60208 USA |
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Abstract: | Multicomponent nanoparticles can be synthesized with either homogeneous or phase-segregated architectures depending on the synthesis conditions and elements incorporated. To understand the parameters that determine their structural fate, multicomponent metal-oxide nanoparticles consisting of combinations of Co, Ni, and Cu were synthesized by using scanning probe block copolymer lithography and characterized using correlated electron microscopy. These studies revealed that the miscibility, ratio of the metallic components, and the synthesis temperature determine the crystal structure and architecture of the nanoparticles. A Co-Ni-O system forms a rock salt structure largely owing to the miscibility of CoO and NiO, while Cu-Ni-O, which has large miscibility gaps, forms either homogeneous oxides, heterojunctions, or alloys depending on the annealing temperature and composition. Moreover, a higher-ordered structure, Co-Ni-Cu-O, was found to follow the behavior of lower ordered systems. |
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Keywords: | doping mixed oxides nanoparticles scanning probe lithography structural evolution |
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