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首页> 外文期刊>Advanced Functional Materials >Growth of Highly Anisotropic 2D Ternary CaTe_2O_5 Flakes on Molten Glass
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Growth of Highly Anisotropic 2D Ternary CaTe_2O_5 Flakes on Molten Glass

机译：高各向异性二维三元CaTe_2O_5鳞片在熔融玻璃上的生长

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Two-dimensional (2D) ternary compounds (2DTCs) have attracted intensive attention due to the new degree of freedom of modulating physical and chemical properties. However, the controllable synthesis of 2DTCs still remains a great challenge impeding further research and applications. Here, for the first time, ultrathin (approximate to 7.4 nm) epsilon-CaTe2O5 flakes with high anisotropy are obtained by a chemical vapor deposition method using soda-lime glass as the capture substrate. The molten glass adsorbs Te vapor in the gas flow to its surface, which reacts with CaO in the molten substrate leading to the precipitation of epsilon-CaTe2O5. Interestingly, epsilon-CaTe2O5 flakes display highly anisotropic band structures and optical properties. Furthermore, low-temperature electrical measurements show that the metal-semiconductor/insulator transition of epsilon-CaTe2O5 is exhibited at about 130 K, and optical phonon assisted hopping of small polarons becomes dominant within the temperature range of 130-300 K. Employing soda-lime glass as the capture substrate may provide a new approach for the synthesis of 2DTCs.
机译：二维（2D）三元化合物（2DTC）由于调节物理和化学性质的新自由度而引起了广泛的关注。然而，2DTC的可控合成仍然是一个巨大的挑战，阻碍了进一步的研究和应用。此处，首次通过以钠钙玻璃作为捕获基板的化学气相沉积法获得了各向异性高的超薄（约7.4 nm）ε-CaTe2 O 5薄片。熔融玻璃将气流中的Te蒸气吸附到其表面，然后与熔融基材中的CaO反应，导致ε-CaTe2O5沉淀。有趣的是，ε-CaTe2O5薄片显示出高度各向异性的能带结构和光学特性。此外，低温电测量表明，ε-CaTe2O5的金属-半导体/绝缘体跃迁在约130 K处表现出来，并且在130-300 K的温度范围内，由光子辅助的小极化子的跃变占主导地位。石灰玻璃作为捕获基质可能为2DTC的合成提供新方法。

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