Lattice strain-enhanced exsolution of nanoparticles in thin films
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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 oC), 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 applications ranging from catalysis, energy conversion/storage, nano-composites, nano-magnetism, to nano-optics.
Han , H , Park , J , Nam , S Y , Choi , G M , Parkin , S S P , Jang , H M & Irvine , J T S 2019 , ' Lattice strain-enhanced exsolution of nanoparticles in thin films ' , Nature Communications , vol. 10 , 1471 . https://doi.org/10.1038/s41467-019-09395-4
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DescriptionThis work was supported by the National Research Foundation (NRF) Grant funded by the Korean Government (MSIP Grant No.2016R 1D1A1B 03933253). J.T.S.I. thanks the EPSRC for support on emergent nanomaterials through grant EP/R023522/1. H.H. and S.S.P.P. acknowledge the support by the Max Planck Society (MPG).
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