纳米氧化钨的调控合成及其光致变色的研究

发布时间：2018-05-21 03:38

本文选题：氧化钨 + 水热合成　；参考：《吉林大学》2015年硕士论文

【摘要】：WO3是一种重要的无机半导体过渡金属氧化物材料，在智能窗、显示器件、光电开关及信息存储器等方面具有很好的应用前景，自上个世纪50年代以来一直受到广大科研工作者的青睐。纳米材料具有特殊的微观结构，由于其小尺寸效应使性能与宏观大尺寸材料有显著的差异，可广泛应用于化学、物理学、电子学、光学、机械、军事和生物医药等方面。由于纳米粒子的微观结构，尺寸和形貌等因素对材料的特性及应用会产生重要影响，故对于纳米粒子形貌的控制研究也引起了人们的极大关注。纳米WO3材料的小尺寸效应，界面效应和场发射效应等，使其在光、电、磁、电子等方面都具有广阔的应用前景。因此，如果我们能够在形貌和微观结构上对WO3施加稳定的影响，就能在多方面改善WO3在各领域中的应用。光致变色是指在激发光源的照射下，材料的颜色可以发生变化，当对材料加热或用另一波长的光照射后其颜色会恢复，这是一个在外界条件下可逆的过程。光致变色因其对颜色的敏感性及一定条件下的可逆性，使得光致变色材料在数据存储器、显示器、智能窗、军事伪装等领域具有广阔的应用前景。在很长的一段时间里，研究的重点一直集中在有机光致变色材料上，对无机材料的研究很少。然而自从Deb的开创性工作之后，越来越多的研究重点集中到了过渡金属氧化物荧光材料上来，尤其是WO3和MoO3。本实验通过简单的水热合成法，，以钨酸钠为钨源，用盐酸对溶液进行酸化，再使用草酸溶解沉淀制成前驱体。通过在前驱体中加入不同的还原或非还原物质，在不同的温度下水热合成制备了多种颜色，多种形貌的纳米级氧化钨粉体，并通过XRD，XPS，SEM，UV-vis，PL等测试手段对产品的形貌和光学性能进行了表征和比较。研究发现蓝色氧化钨样品具有更好的光吸收率和光致变色强度，且相比于传统的工业制蓝色氧化钨在空气中具有更好的稳定性，具有长远的应用前景。
[Abstract]:WO3 is an important inorganic semiconductor transition metal oxide material, which has a good application prospect in smart windows, display devices, optoelectronic switches and information memory, etc. Since the 50's of last century, has been favored by the majority of scientific research workers. Nanomaterials have special microstructure. Because of their small size effects, the properties of nanomaterials are obviously different from those of macroscopical materials. They can be widely used in chemistry, physics, electronics, optics, machinery, military and biomedicine. As the microstructure, size and morphology of nanoparticles have an important impact on the properties and applications of the materials, the control of the morphology of nanoparticles has attracted great attention. The small size effect, interface effect and field emission effect of nanometer WO3 materials make them have a broad application prospect in light, electricity, magnetism, electron and so on. Therefore, if we can exert a stable influence on the morphology and microstructure of WO3, we can improve the application of WO3 in various fields. Photochromism means that the color of the material can change under the irradiation of the excited light source. When the material is heated or irradiated with another wavelength, the color of the material will recover, which is a reversible process under the external conditions. Because of its sensitivity to color and reversibility under certain conditions, photochromic materials have broad application prospects in data storage, display, intelligent window, military camouflage and so on. For a long time, the focus of research has been on organic photochromic materials, but little on inorganic materials. However, since Deb's pioneering work, more and more research has focused on transition metal oxide fluorescent materials, especially WO3 and Moo _ 3. In this experiment, the solution was acidified by hydrochloric acid with sodium tungstate as tungsten source by a simple hydrothermal synthesis method, and then the precursor was prepared by oxalic acid dissolution and precipitation. Nanocrystalline tungsten oxide powders of various colors and morphologies were prepared by adding different reductive or non-reductive substances to the precursor and hydrothermal synthesis at different temperatures. The morphology and optical properties of the products were characterized and compared by means of XRDX, XRDX, SEMU, UV-vis-PL and so on. It is found that the blue tungsten oxide has better photoabsorption rate and photochromic intensity, and has better stability in air than the traditional industrial tungsten oxide, and has a long-term application prospect.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;TQ136.13

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