基于钨的半导体纳米材料的合成及性能研究

发布时间：2018-04-21 15:30

  本文选题：氧化钨 + 复合纳米材料　； 参考：《北京化工大学》2016年硕士论文

【摘要】：近年来,基于钨的半导体纳米材料受到人们的广泛关注,特别是其中的氧化钨纳米材料引起了学者们的研究兴趣。氧化钨尤其是非化学计量的氧化钨(WO2.9, WO2.83, WO2.72等)具有稳定的结晶态,拥有宽的吸收光谱,这些独特的性质使得氧化钨在光催化、电化学、光热治疗和气敏传感等方面有广泛的应用前景。本文利用一步合成的方法制备出了单分散纳米针状的氧化钨(W17047)并对反应产物进行了表征,对反应条件进行了研究,对反应产物的光热性能进行了探究。同时,利用溶剂热合成的方法制备了W17O47@MOS2纳米晶,并探究了它的电化学性能。主要成绩如下：1、采用一步法合成了单分散的W17047针状纳米晶。考察了多种因素对W17047纳米晶形貌的影响,得到了最佳的合成条件。利用聚乙烯吡咯烷酮对得到的油相W17047纳米晶进行表面功能化修饰使其由油相转移到水相,便于生物应用,进一步研究了它的光热性能,发现在808 nm激光照射下,W17047纳米材料在6分钟的时间内温度最高可升高25℃,有良好的光热效果,渴望应用于光热成像和光热治疗等领域。2、采用两步法合成W17O47@MoS2纳米晶,研究了所得纳米晶的电催化性能。实验证明所合成的纳米材料具有较好的电催化析氢的性能,可能是由于MoS2被负载到纳米针状的W17047材料上,使其暴露出更多的活性位点,进而表现出较好的电催化析氢活性。利用该方法合成的W17O47@MoS2纳米晶经由乙酸处理后,进行了一系列的电化学性能测试。研究发现W17O47@MoS2纳米晶的电催化析氢的效果比单纯的W17047纳米材料的效果好。
[Abstract]:In recent years, tungsten based semiconductor nanomaterials have attracted much attention, especially tungsten oxide nanomaterials. Tungsten oxide, especially non-stoichiometric tungsten oxide (WO _ 2. 9, WO _ 2. 83, WO2.72, etc.) has stable crystalline state and wide absorption spectrum. These unique properties make tungsten oxide photocatalytic and electrochemical. Photothermal therapy and gas sensing have wide application prospects. In this paper, monodisperse nanocrystalline tungsten oxide W17047) was prepared by one-step synthesis method. The reaction products were characterized, the reaction conditions were studied, and the photothermal properties of the reaction products were investigated. At the same time, W17O47@MOS2 nanocrystals were prepared by solvothermal synthesis and their electrochemical properties were investigated. The main achievements are as follows: 1. Monodisperse needle-like nanocrystalline W17047 was synthesized by one step method. The effects of various factors on the morphology of W17047 nanocrystalline were investigated and the optimum synthesis conditions were obtained. Poly (vinylpyrrolidone) was used to functionalize the oil phase W17047 nanocrystalline from oil phase to water phase, which was convenient for biological application. The photothermal properties of W17047 nanocrystalline were further studied. It was found that the temperature of W17047 nanomaterials could be increased by 25 鈩，

本文编号：1783021