Tuning the functionalities of a mesocrystal via structural coupling

Heng Jui Liu, Yun Ya Liu, Chih Ya Tsai, Sheng Chieh Liao, Ying Jiun Chen, Hong Ji Lin, Chih Huang Lai, Wen Feng Hsieh, Jiang Yu Li, Chien Te Chen, Qing He, Ying-hao Chu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

In the past decades, mesocrystal, a kind of nanocrystals with specific crystallographic orientation, has drawn a lot of attention due to its intriguing functionalities. While the research community keeps searching for new mesocrystal systems, it is equally crucial to develop new approaches to tune the properties of mesocrystals. In this work, a self-organized two-dimensional mesocrystal composed of highly oriented CoFe 2 O 4 (CFO) nano-crystals with assistance of different perovskite matrices is studied as a model system. We have demonstrated that the strain state and corresponding magnetic properties of the CFO mesocrystal can be modulated by changing the surrounding perovskite matrix through their intimate structural coupling. Interestingly, this controllability is more strongly correlated to the competition of bonding strength between the matrices and the CFO mesocrystals rather than the lattice mismatch. When embedded in a matrix with a higher melting point or stiffness, the CFO mesocrystal experiences higher out-of-plane compressive strain and shows a stronger magnetic anisotropy as well as cation site-exchange. Our study suggests a new pathway to tailor the functionalities of mesocrystals.

Original languageEnglish
Article number12073
Pages (from-to)1-10
Number of pages10
JournalScientific reports
Volume5
DOIs
StatePublished - 14 Jul 2015

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