General Chemical Vapor Deposition Approach for Synthesizing Two-Dimensional Alkali and Alkaline Earth Niobates and Their High-Entropy Analogues.
basic_science · Level V
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- Record sourced from PubMed, PMID 42080378.
- Also identified by DOI 10.1021/acs.nanolett.6c00771.
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Abstract
A flux-assisted chemical vapor deposition (CVD) strategy is developed to synthesize two-dimensional (2D) alkali and alkaline-earth niobates, exemplified by quaternary RbCa<sub>2</sub>Nb<sub>3</sub>O<sub>10</sub> and ternary Rb<sub>4</sub>Nb<sub>11</sub>O<sub>30</sub> that were previously unattainable in ultrathin crystalline form as well as CaNb<sub>2</sub>O<sub>6</sub> and KNb<sub>3</sub>O<sub>8</sub>. The flux-mediated process enables the controlled growth of high-quality layered crystals with atomically flat surfaces, well-defined lattice structures, and outstanding dielectric performance, including high permittivity, large breakdown fields, and seamless integration with 2D channel materials. Furthermore, the method is extended to the synthesis of high-entropy analogues, producing multication 2D niobates with uniform elemental distribution across the flake. This work establishes flux-assisted CVD as a versatile and scalable platform for the synthesis of complex 2D oxides and highlights the promise of these materials as high-performance dielectrics in future 2D nanoelectronics.