易溶水热法制备氧化钨纳米结构的温度介导相变和光学性质

N. L. Pham, T. Luu, Thi Tuyet Mai Nguyen, V. Pham, H. L. Nguyen, C. Nguyen
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引用次数: 0

摘要

在不同的反应温度和强酸性环境下,采用无添加剂的简易水热法一步合成了不同的氧化钨纳米晶体。在室温至220℃的反应温度范围内,观察到样品的相变、形貌和光学性质的变化。随着反应温度从室温升高到100⁰C,再到220⁰C,晶相从单斜WO3∙2H2O转变为正交WO3∙H2O,然后转变为单斜WO3。与相变相对应,光带隙由2.43 eV增大到2.71 eV,形貌由纳米板变为纳米立方体。反应温度对相变的影响主要体现在脱水过程中,随着反应温度的升高,反应温度对相变的影响越来越大。这些结果提供了对相变的深入了解,并暗示了一种用于各种应用的操纵氧化钨纳米结构的晶相和形貌的简单方法。
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Temperature-mediated Phase Transformation and Optical Properties of Tungsten Oxide Nanostructures Prepared by Facile Hydrothermal Method
Different tungsten oxide nanocrystals were synthesized via facile hydrothermal process – one-step and free of additives - at different reaction temperatures and a highly acidic environment. The phase transformation of samples, followed by the change of morphology and optical properties, was observed as the reaction temperature varied from room temperature to 220oC. The crystal phase transformed from monoclinic WO3∙2H2O to orthorhombic WO3∙H2O, then to monoclinic WO3 as the reaction temperature increased from room temperature to 100 ⁰C, then to 220 ⁰C. Corresponding to the phase transformation, the optical bandgap increased from 2.43 eV to 2.71 eV, and the morphology varied from nanoplate to nanocuboid. The effect of the reaction temperature on the phase transformation was assigned to the dehydration process, which became stronger as the reaction temperature increased. These results gave an insight into the phase transformation and implied a simple method for manipulating the crystal phase and morphology of tungsten oxide nanostructure for various applications.
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