基于量子点荧光特征应力应变监测的稳定性研究

发布时间：2018-05-28 03:31

本文选题：量子点 + 应变监测　；参考：《华东理工大学》2017年硕士论文

【摘要】：设备失效作为影响工业生产的重要问题之一,通常是由于未能及时监测到设备应力应变状况发生改变,从而影响设备结构的安全运行。而现有的应力应变监测技术仍存在局限性,并不能广泛应用于工业生产中。本文基于CdSe/ZnS核壳量子点,研究其在不同载荷下荧光特征的变化情况。以量子点为对象,研究其在不同的环境条件下,测试其荧光特征光谱的稳定性,并对其光活化机机理进行探索;同时,通过实验测试量子点-环氧树脂复合材料的荧光特征强度与应力应变之间的关系并进行机理解析。论文主要获得以下研究成果:(1)量子点在紫外激发下,水分子能够对其表面的缺陷进行钝化,并增强其荧光特征强度;而空气中的氧气则会对量子点表面进行氧化腐蚀,并减小其尺寸。(2)通过分析量子点-环氧树脂试样在实验前后的TEM图像,结果显示试样荧光特征强度在受到拉伸、压缩及冲击载荷时发生改变的现象主要是由于量子点在环氧树脂中的浓度变化引起的。
[Abstract]:As one of the most important problems affecting industrial production, equipment failure is usually due to the failure to monitor the change of equipment stress and strain state in time, thus affecting the safe operation of equipment structure. However, the existing stress-strain monitoring technology is still limited and can not be widely used in industrial production. Based on CdSe/ZnS core-shell quantum dots, the variation of fluorescence characteristics under different loads is studied. The stability of fluorescence characteristic spectra of quantum dots under different environmental conditions was studied, and the mechanism of their photoactivators was explored. The relationship between the fluorescence characteristic strength and stress strain of quantum dot-epoxy resin composite was measured and the mechanism was analyzed. In this paper, the following research results are obtained: (1) under UV excitation, water molecules can passivate the defects on the surface of quantum dots and enhance their fluorescence characteristic strength, while oxygen in the air can oxidize the surface of the quantum dots. By analyzing the TEM images of quantum dot-epoxy resin samples before and after the experiment, the results show that the fluorescence characteristic strength of the samples is tensile. The change of compression and impact load is mainly due to the change of quantum dot concentration in epoxy resin.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O657.3;TB332

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