Lattice strain-enhanced exsolution of nanoparticles in thin films

Hyeon Han, Jucheol Park, Sang Yeol Nam, Kun Joong Kim, Gyeong Man Choi, Stuart S. P. Parkin (), Hyun Myung Jang () and John T. S. Irvine ()
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Hyeon Han: Pohang University of Science and Technology (POSTECH)
Jucheol Park: Gumi Electronics & Information Technology Research Institute
Sang Yeol Nam: Gumi Electronics & Information Technology Research Institute
Kun Joong Kim: Pohang University of Science and Technology (POSTECH)
Gyeong Man Choi: Pohang University of Science and Technology (POSTECH)
Stuart S. P. Parkin: Max Planck Institute of Microstructure Physics
Hyun Myung Jang: Pohang University of Science and Technology (POSTECH)
John T. S. Irvine: University of St Andrews

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-09395-4

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