氧化钨纳米花材料的制备及其应用

发布时间：2018-05-08 08:52

本文选题：氧化钨 + 纳米花　；参考：《五邑大学》2017年硕士论文

【摘要】：金属氧化物纳米材料因其表现出新颖的物理特性,在光电学、传感器、光催化等领域受到研究者广泛的关注。近年来,过渡金属氧化物纳米材料——氧化钨纳米材料也成为了科技和工程领域的一个研究焦点,主要是由于它具有特别的纳米形貌和能带结构,在光电子器件、电化学等领域具有巨大的潜在应用价值。本论文的研究工作主要集中在于探索氧化钨三维复合纳米结构材料的制备和应用,首先尝试制备出不同的氧化钨纳米材料,然后把这类材料应用于气敏传感器领域和光催化降解染料,最后通过材料表征、性能测试、机理分析与讨论。本论文所取得的主要研究结论,可概述如下:1.发展了一种用于制备金属及其氧化物核壳结构的种子种植法,并定域生长了一种W-W_(18)O_(49)纳米花结构体。通过SEM、XRD、TEM进行表征,同时通过记录材料的生长过程,建立了氧化钨纳米花的生长机理模型,为在纳米空间进行人为的精确定向排列和组装,以及构造新型的三维复合纳米材料打下了基础。2.利用WO_3纳米花结构体的高比表面积以及Pt表面修饰,制备了基于纳米花结构体薄膜的气体传感器,在室温下对传感器的气敏特性和反应机理进行系统的研究。研究表明,Pt表面修饰WO_3纳米花结构体薄膜在室温下具有较高灵敏度,该薄膜的氢气浓度检测量程为50 ppm~5000 ppm,其电阻变化率与氢气浓度成线性关系,其检测范围已达到标准的工业氢气检测范围,能够有效地降低了氢气传感器的工作温度。气敏传感机理与表面势垒调控和结构水模型有关。3.通过高温无氧退火,在碳纤维布上构建了具有氧缺陷的W_(18)O_(49)光催化材料,发现该材料在可见光或无光环境下均可降解甲基橙染料分子,并通过其催化性能进行测试和分析,试图探索氧缺陷W_(18)O_(49)光催化材料的催化反应降解甲基橙机理。该研究结果的意义在于扩展氧化钨光催化材料的光谱响应范围至可见光区,也有助于在暗环境中降解污水的有毒染料分子。
[Abstract]:Metal oxide nanomaterials have attracted extensive attention in the fields of optoelectronics, sensors, photocatalysis and so on for their novel physical properties. In recent years, transition metal oxide nanomaterials, tungsten oxide nanomaterials, have also become a research focus in the fields of science, technology and engineering, mainly because they have special nano-morphology and band structure in optoelectronic devices. Electrochemistry and other fields have great potential application value. In this paper, the main research work is to explore the preparation and application of tungsten oxide three-dimensional composite nanostructured materials. First, we try to prepare different tungsten oxide nanomaterials. Then this kind of material is applied to the field of gas sensor and photocatalytic degradation of dyes. Finally, the material characterization, performance test, mechanism analysis and discussion are carried out. The main conclusions of this paper can be summarized as follows: 1. A seed planting method for the preparation of metal and its oxide core-shell structure was developed, and a W-W _ S _ (18) O _ (T _ (49)) nano-flower structure was grown locally. The growth mechanism model of tungsten oxide nanowires was established by means of SEM XRDX TEM and the growth process of the materials were recorded. And the construction of new three dimensional composite nanomaterials lay the foundation. 2. 2. Based on the high specific surface area and Pt surface modification of WO_3 nano-flower structure, a gas sensor based on nano-flower structure film was prepared. The gas sensing characteristics and reaction mechanism of the sensor were systematically studied at room temperature. The results show that the surface modification of WO_3 nanostructured WO_3 thin films has a high sensitivity at room temperature. The hydrogen concentration detection range of the films is 50 ppm~5000 ppm.The change rate of resistance is linearly related to the hydrogen concentration. Its detection range has reached the standard industrial hydrogen detection range, which can effectively reduce the working temperature of hydrogen sensor. Gas sensing mechanism is related to surface barrier regulation and structural water model. A novel photocatalytic material with oxygen defect, WSCL _ (18) O / O _ (49), was constructed on carbon fiber cloth by high temperature anoxic annealing. It was found that the material could degrade methyl orange dye molecule in visible light or light free environment, and its catalytic properties were tested and analyzed. This paper attempts to explore the mechanism of catalytic degradation of methyl orange by photocatalytic materials. The significance of this study lies in extending the spectral response range of tungsten oxide photocatalytic materials to the visible region, and also contributing to the degradation of toxic dyestuff molecules in dark environment.
【学位授予单位】：五邑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ136.13;TB383.1

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