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Figure 2. Synthesis and characterization of freestanding BaZrO₃ (~30 nm) membranes. (A) Schematic figures of the fabrication of BaZrO₃ membranes via etching of SrCuO₂ sacrificial layers using KI solutions [HCL: 10 mL + H₂O: 100 mL + KI: 8 mg]. (B and C) The XRD analyses of the as-transferred (5 × 5 mm²) single-crystalline freestanding BaZrO₃ membranes on mica substrates and the corresponding rocking-curve data of the (002) BaZrO₃ Bragg peaks. (D) Photographs of the as-transferred freestanding BaZrO₃ membranes on mica substrates. (E) The AFM topography images of the as-transferred freestanding BaZrO₃ membranes. (F) The RSMs data for verifying the BaZrO₃ peaks positions around the (-103) Bragg peaks of the freestanding BaZrO₃ membranes.