Abstract
Determining the appropriate water-soluble sacrificial layer is crucial for fabricating large-scale free-standing oxide membranes.Here,we introduce a new water-soluble sacrificial layer called"super tetragonal"Sr4Al2O7.In contrast to Sr3Al2O6,the low-symmetry crystal structure demonstrates excellent resilience to epitaxial strain,allowing for a wide range of lattice constant tunability.The defect-free interfaces within the heterogeneous structure of encapsulated crystalline ABO3/Sr4Al2O7 effectively mitigate crack formation in the free-standing oxide film during water release.Additionally,this new material exhibits a faster rate of water dissolution.Furthermore,its higher interfacial bonding energy and excellent chemical stability enable the preparation of high-quality and high-integrity free-standing oxide films.
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