Synthetic techniques to prepare large-size, flexible, and high-quality singlecrystalline
sheets of transition metal oxides are crucial to developing lowenergy
consumption devices. One promising way is a lift-off and transfer
technique using a heterostructure of polymer supporting oxide and Sr3Al2O6
(SAO) layers grown on a single-crystalline substrate. By removing the
water-soluble SAO and the supporting layers, the oxide sheet is obtained.
Although some ferroelectric flexible sheets are prepared by this method, a
simpler method for obtaining large-size sheets is required. Herein, a lift-off
and transfer method is proposed without a supporting layer. With this
simple method, single-crystalline SrRuO3 and BaTiO3 flexible sheets with a
lateral size of a few millimeters are successfully prepared. The SrRuO3 sheet
exhibits high crystallinity and conductivity. Meanwhile, the ferroelectricity
of the BaTiO3 sheet is successfully observed via polarization hysteresis loop
measurements. In addition to the simplicity, this method has low costs and
the substrate is reusable. Accordingly, the proposed method could enhance
the development of various kinds of large-size functional oxide sheets.
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