有机小分子纳米材料的制备及其光学性能研究

发布时间：2018-06-08 02:50

本文选题：微纳材料 + 10-羟基苯并喹啉铍　；参考：《北京交通大学》2015年硕士论文

【摘要】：纳米科技作为21世纪主导的科学技术之一,其目标是以原子、分子或宏观材料为出发点,利用物质在纳米尺度上的各种奇异性能,制造出具有特定功能的产品。发展方便有效的方法制备具有特定形貌和尺寸的纳米材料对于功能纳米材料及新型器件的研究都起着至关重要的作用。然而,相对于无机材料,有机分子在熔点和热稳定性等方面的不足,导致有机纳米材料的可控性制备具有一定难度,一般无法采用无机纳米材料的制备方法。因此,探索有机纳米材料在形貌和性能方面的可控制备受到研究者们越来越多的关注。本文选取了金属有机小分子配合物10-羟基苯并喹啉铍(BeBq2),系统研究了有机小分子纳米材料的形貌调控、生长机理及其光学性能。 (1)利用再沉淀法,对金属有机配合物BeBq2的微纳结构进行了形貌调控,通过选择不同的良溶剂和不良溶剂,分别制备了BeBq2矩形纳米片、平行四边形纳米片及一维纳米线。在纳米线的生长过程中,CTAB起到软模板的作用。利用扫描电镜对其微纳结构的形貌及尺寸进行了表征,同时采用荧光显微技术表征了微纳结构的发光性能。其中BeBq2矩形纳米片具有显著的光波导现象。通过BeBq2单晶数据分析,确定了分子排列方式,研究了微纳结构的生长机理。 (2)基于以上三种微纳结构,本文选择光波导现象显著的矩形纳米片,对其生长机理及光学性能进行了进一步研究。利用再沉淀法,以DMF为良溶剂,正己烷为不良溶剂,制备了形貌良好、尺寸均一,长10μm、宽5μm、厚度几百纳米的BeBq2矩形纳米片。通过XRD的结晶性表征以及BeBq2的单晶数据,分析了矩形纳米片的生长机理。同时对纳米片的光学性能,尤其是光波导性能进行了较为系统的研究。稳态光谱表明BeBq2纳米片的发射峰相对于单体分子和固体粉末分别红移26nm和15nm。通过近场光学扫描显微镜,发现BeBq2矩形纳米片具有良好的光波导性能,并计算了纳米片发射的荧光沿长边方向传播的衰减率。
[Abstract]:Nanotechnology is one of the leading science and technology in the 21st century. Its goal is to make products with specific functions by using the strange properties of materials on nanometer scale, starting from atoms, molecules or macroscopic materials. The development of convenient and effective methods for the preparation of nanomaterials with specific morphology and size plays an important role in the study of functional nanomaterials and novel devices. However, compared with inorganic materials, the shortcomings of organic molecules in melting point and thermal stability lead to the difficulty of controllable preparation of organic nanomaterials. therefore More and more researchers pay more and more attention to exploring the control of morphology and properties of organic nanomaterials. In this paper, the organic nanolayers, 10-hydroxybenzo-quinoline beryllium (10-hydroxybenzoquinoline) beryllium, have been systematically studied. The shape control of rice material, Growth mechanism and optical properties. The morphology of organometallic complex BeBq2 was controlled by reprecipitation method. The rectangular BeBq2 nanocrystals were prepared by selecting different good solvents and bad solvents. Parallelogram nanocrystals and one-dimensional nanowire. CTAB acts as a soft template during the growth of nanowires. The morphology and size of the nanostructure were characterized by scanning electron microscope (SEM). The luminescent properties of the nanostructure were characterized by fluorescence microscopy. Among them, BeBq2 rectangular nanochip has obvious optical waveguide phenomenon. Based on the data analysis of BeBq2 single crystal, the molecular arrangement and the growth mechanism of micro / nano structure are determined. The growth mechanism and optical properties were further studied. Using DMF as good solvent and n-hexane as bad solvent, BeBq2 rectangular nanocrystals with good morphology, uniform size, length of 10 渭 m, width of 5 渭 m and thickness of several hundred nanometers were prepared by reprecipitation method. The growth mechanism of rectangular nanocrystals was analyzed by XRD characterization and single crystal data of BeBq2. At the same time, the optical properties of nanocrystals, especially optical waveguides, are studied systematically. The steady-state spectra show that the emission peaks of BeBq2 nanoparticles are red-shifted to 26nm and 15nm relative to monomers and solid powders, respectively. The near field optical scanning microscope shows that BeBq2 rectangular nanocrystals have good optical waveguide performance and the attenuation rate of fluorescence emission along the long side is calculated.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

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