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Journal Article

Lattice strain-enhanced exsolution of nanoparticles in thin films

MPS-Authors
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Han,  Hyeon
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Parkin,  Stuart S. P.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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s41467-019-09395-4.pdf
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Citation

Han, H., Park, J., Nam, S. Y., Kim, K. J., Choi, G. M., Parkin, S. S. P., et al. (2019). Lattice strain-enhanced exsolution of nanoparticles in thin films. Nature Communications, 10: 1471. doi:10.1038/s41467-019-09395-4.


Cite as: http://hdl.handle.net/21.11116/0000-0008-E026-0
Abstract
Nanoparticles formed on oxide surfaces are of key importance in many fields such as catalysis and renewable energy. Here, we control B-site exsolution via lattice strain to achieve a high degree of exsolution of nanoparticles in perovskite thin films: more than 1100 particles μm-2 with a particle size as small as ~5 nm can be achieved via strain control. Compressive-strained films show a larger number of exsolved particles as compared with tensile-strained films. Moreover, the strain-enhanced in situ growth of nanoparticles offers high thermal stability and coking resistance, a low reduction temperature (550 °C), rapid release of particles, and wide tunability. The mechanism of lattice strain-enhanced exsolution is illuminated by thermodynamic and kinetic aspects, emphasizing the unique role of the misfit-strain relaxation energy. This study provides critical insights not only into the design of new forms of nanostructures but also to applications ranging from catalysis, energy conversion/storage, nano-composites, nano-magnetism, to nano-optics.