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Reaction time effect of straw-like MoO3 prepared with a facile, additive-free hydrothermal process

机译：简便，无添加剂的水热法制备的稻草状MoO3的反应时间效应

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摘要

The production of molybdenum oxide materials with novel morphology exhibiting unique functions is challenging. Here we investigate the growth process of molybdenum oxide powder with straw-like structures via a facile and additive-free hydrothermal process by varying the reaction time. The crystal structure, morphology and microstructure of samples were characterized to understand the mechanism of formation. Furthermore, optical properties were characterized by ultraviolet-visible diffuse reflectance spectroscopy and color difference meter. The results demonstrate that the as-prepared MoO3 powders possess the same absorption threshold 420 nm and band gap of 3.16 eV. In addition, we found that the nanofibers were peeled off from the prisms and the median state of the product (columnar structures with cavities surrounded by nanofibers) exhibits the most optimal photochromic properties due to the enhanced light harvesting from multiple light reflections and scattering in-between the cavities of the MoO3 columnar structures.
机译：具有表现出独特功能的新颖形态的氧化钼材料的生产具有挑战性。在这里，我们通过改变反应时间，通过简便，无添加剂的水热过程研究了稻草状氧化钼粉末的生长过程。对样品的晶体结构，形貌和微观结构进行表征，以了解其形成机理。此外，通过紫外可见漫反射光谱法和色差仪表征了光学性质。结果表明，所制备的MoO3粉末具有相同的420 nm吸收阈值和3.16 eV的带隙。此外，我们发现纳米纤维已从棱镜上剥落，并且产品的中位状态（具有被纳米纤维包围的腔的柱状结构）由于从多次光反射和散射中增强了光的收集而表现出最佳的光致变色性能。在MoO3柱状结构的空腔之间。

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