Lattice strain-enhanced exsolution of nanoparticles in thin films
- Authors
- Han, Hyeon; Park, Jucheol; Nam, Sang Yeol; Kim, Kun Joong; Choi, Gyeong Man; Parkin, Stuart S. P.; Jang, Hyun Myung; Irvine, John T. S.
- Issue Date
- 1-Apr-2019
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE COMMUNICATIONS, v.10
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 10
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/28208
- DOI
- 10.1038/s41467-019-09395-4
- ISSN
- 2041-1723
- 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 mu m(-2) with a particle size as small as similar to 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 degrees 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.
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