无机—有机层状超分子光功能材料的制备与性能研究

发布时间：2018-06-23 06:11

本文选题：LDHs纳米片 + 层层自组装　；参考：《北京化工大学》2015年硕士论文

【摘要】：本文利用氢键自组装的方法,分别将有机荧光小分子和荧光量子点与层状复合金属氢氧化合物(LDHs)进行组装,制备了荧光超薄膜和量子点水滑石复合物,并对其结构和形貌进行表征,同时研究了其在硝基苯(NB)气体检测和LED白光以及压力传感等方面的应用。具体研究内容如下：1、对环境污染物具有检测效果的荧光薄膜材料是一类重要的环境监测可视材料。本文采用层层自组装(LBL)的方法构筑了有机-无机LDHs纳米超薄膜CXT/LDH,同时该薄膜对于有机挥发性有毒气体硝基苯具有可重复性荧光响应。结构和形貌测试表明此薄膜表面连续致密,同时具有垂直于基底方向的周期性层状结构。AFM和SEM测试表明此薄膜具有周期性结构的每层厚度为25nm左右,同时也证明了该薄膜具有均匀的表面形貌。此外,CXT/LDH超薄膜表现出对NB气体的快速可视荧光检测响应,并且具有低至4.02ppb的检测限,良好的可重复性以及较高的选择性。通过与合适的荧光客体香豆素-6结合,该薄膜也能够拓展到双色荧光体系,并表现出对NB气体同时具有荧光强度变化和比率荧光的特性,这表明这些薄膜可以作为一类新的固态荧光传感器。因此,本论文提供了一种层层自组装方法来制备新型荧光超薄膜材料,并探讨了其对NB气体的荧光检测行为。2、通过水相法合成了巯基丁二酸保护的CdTe量子点,并通过与硝酸根镁铝LDHs的共混组装,制备了具有不同荧光发射的量子点LDHs复合物,并对其结构和形貌进行表征,同时研究了微观尺寸上该复合物所表现出的荧光六方晶片结构。进一步研究,我们通过层层自组装的方法,制备了具有不同荧光发射的量子点LDHs薄膜,通过红色和绿色颜色荧光量子点与蓝色荧光的CXT交替组装,制备了具有白光发射的超薄膜。最后,我们通过胶体LDHs与量子点溶液进行共混组装制备了不同荧光发射的量子点胶体LDHs复合物,并且研究发现压力对其荧光强度具有一定的猝灭行为。
[Abstract]:In this paper, fluorescence ultrathin films and quantum dot hydrotalcite complexes were prepared by assembling organic fluorescent small molecules and fluorescent quantum dots with layered composite metal hydroxides (LDHs) by hydrogen bonding self-assembly. Its structure and morphology were characterized, and its applications in nitrobenzene (NB) gas detection, LED white light and pressure sensing were studied. The specific research contents are as follows: 1. Fluorescent thin film material which can detect environmental pollutants is an important visual material for environmental monitoring. In this paper, the organic-inorganic LDHs nanocrystalline ultrathin film CXT / LDH was constructed by layer self-assembly (LBL) method, and the film has repeatable fluorescence response to organic volatile toxic gas nitrobenzene. The structure and morphology of the film show that the surface of the film is continuous and compact, and the periodic layered structure perpendicular to the substrate. AFM and SEM measurements show that the thickness of each layer of the film with periodic structure is about 25nm. At the same time, it is proved that the film has uniform surface morphology. In addition, CXT / LDH ultrathin films show rapid visual fluorescence detection response to NB gas, and have low detection limit of 4.02ppb, good repeatability and high selectivity. By combining with the appropriate fluorescent guest coumarin -6, the film can also be extended to the two-color fluorescence system, and it has the characteristics of both fluorescence intensity variation and ratio fluorescence to NB gas. This indicates that these thin films can be used as a new kind of solid state fluorescence sensor. Therefore, this paper provides a layer by layer self-assembly method to prepare novel fluorescent ultrathin film materials, and discusses the fluorescence detection behavior of NB gas. The thiosuccinic acid protected CdTe quantum dots are synthesized by aqueous phase method. The quantum dot LDHs complex with different fluorescence emission was prepared by blending and assembling with magnesium aluminum nitrate LDHs. The structure and morphology of LDHs were characterized. The photoluminescence hexagonal wafer structure of the complex was also studied. Furthermore, we prepared LDHs thin films with different fluorescence emission by layer self-assembly method. The LDHs thin films were assembled alternately by red and green color fluorescent quantum dots and blue fluorescence CXT. Ultrathin films with white light emission were prepared. Finally, we prepared different fluorescence emission quantum dot colloidal LDHs complexes by blending and assembling the colloidal LDHs with quantum dot solution. It was found that the pressure had a certain quenching behavior on the fluorescence intensity of LDHs.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O641.3;TB34

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