Hierarchical Templating of a BiFeO3鈥揅oFe2O4 Multiferroic Nanocomposite by a Triblock Terpolymer Film

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• 作者：Hong Kyoon Choi ; Nicolas M. Aimon ; Dong Hun Kim ; Xue Yin Sun ; Jessica Gwyther ; Ian Manners ; Caroline A. Ross
• 刊名：ACS Nano
• 出版年：2014
• 出版时间：September 23, 2014
• 年：2014
• 卷：8
• 期：9
• 页码：9248-9254
• 全文大小：551K
• ISSN：1936-086X

文摘

A process route to fabricate templated BiFeO₃/CoFe₂O₄ (BFO/CFO) vertical nanocomposites is presented in which the self-assembly of the BFO/CFO is guided using a self-assembled triblock terpolymer. A linear triblock terpolymer was selected instead of a diblock copolymer in order to produce a square-symmetry template, which had a period of 44 nm. The triblock terpolymer pattern was transferred to a (001) Nb:SrTiO₃ substrate to produce pits that formed preferential sites for the nucleation of CFO crystals, in contrast to the BFO, which wetted the flat regions of the substrate. The crystallographic orientation and magnetic properties of the templated BFO/CFO were characterized.

Keywords:

directed self-assembly; spinel-perovskite nanocomposite; triblock terpolymer