多元异质结构复合材料的气敏及荧光特性研究

发布时间：2018-04-23 23:20

  本文选题：CdSxSe1-x + ZnxCd1-xSySe1-y　； 参考：《苏州大学》2015年硕士论文

【摘要】：如今,科技的发展在迅速带动社会经济的同时也对人类生活的环境产生了不可忽视的影响。近年来,汽车尾气、工业废气等各种污染气体的大量排放,使得空气污染问题日益严重,而各大城市的雾霾天气也越来越多,于是开发能够准确快速探测各种目标气体的高质量传感器是科学研究的重要任务之一。对于性能优良的气敏传感器来说,不仅需要具备对目标气体有好的选择性和高的灵敏度,更需要拥有强的稳定性、长的寿命和低的操作温度。为了提升材料的各方面气敏性能,人们开始寻找一些外在条件的辅助作用,于是可见光增强的气敏材料就成了当今研究的热点。本论文研究内容包括以下三个方面:(1)通过物理气相沉积法,以金作为催化剂成功的制备了CdSxSe1-x纳米带。纳米带高的比表面积能够有效地促进载流子的传输,使其在基于可见光增强的气敏传感器方面表现出良好的性能。与黑暗条件下相比,该传感材料在可见光照条件下的最佳操作温度降低了100℃。而更为重要的是,CdSxSe1-x纳米带能应用于可见光激发的气敏元件用来在常温下检测乙酸气体。(2)基于以上工作的基础上,通过调控产物沉积的位置合成了组成可变的CdSxSe1-x纳米带。本实验主要研究了CdSxSe1-x纳米带的两种组成结构(x=0.47和x=0.79)的荧光特性,研究结果表明产物的荧光峰强度与入射光的功率大小密切相关。(3)使用CdSe和ZnS为原材料成功制备出四元化合物ZnxCd1-xSySe1-y纳米带,并通过沉积位置温度的变化来控制纳米带的组成。实验中主要选取了四种成分的ZnxCd1-xSySe1-y纳米带进行了研究,四个样品均只显示出一个单一的接近带边缘的发射峰,且峰的位置能够从677 nm移动到585 nm。这种成分可控的材料为多光谱探测、全光谱太阳能电池以及超宽可调纳米激光器等多个领域的发展开辟了一个新的方向。
[Abstract]:Nowadays, the development of science and technology not only drives the social economy rapidly, but also has a noticeable influence on the environment of human life. In recent years, the air pollution problem is becoming more and more serious due to the emission of various kinds of pollution gases, such as automobile exhaust gas, industrial exhaust gas and so on, and the weather of haze in every big city is also more and more. Therefore, the development of high-quality sensors that can accurately and quickly detect all kinds of target gases is an important part of scientific research. For the gas sensor with good performance, it is necessary not only to have good selectivity and high sensitivity to the target gas, but also to have strong stability, long life and low operating temperature. In order to improve the gas sensing properties of materials, people began to look for some auxiliary effects of external conditions, so the visible light-enhanced gas sensing materials have become the focus of research today. The main contents of this thesis are as follows: 1) CdSxSe1-x nanobelts were successfully prepared by physical vapor deposition with gold as catalyst. The high specific surface area of nanobelts can effectively promote the transport of carriers and make them exhibit good performance in gas-sensing sensors based on visible light enhancement. Compared with the dark condition, the optimum operating temperature of the sensing material under visible illumination is reduced by 100 鈩，

本文编号：1794096