發(fā)布時間：2018-06-23 06:11

  本文選題：LDHs納米片 + 層層自組裝��； 參考：《北京化工大學》2015年碩士論文

【摘要】：本文利用氫鍵自組裝的方法,分別將有機熒光小分子和熒光量子點與層狀復合金屬氫氧化合物(LDHs)進行組裝,制備了熒光超薄膜和量子點水滑石復合物,并對其結構和形貌進行表征,同時研究了其在硝基苯(NB)氣體檢測和LED白光以及壓力傳感等方面的應用。具體研究內(nèi)容如下：1、對環(huán)境污染物具有檢測效果的熒光薄膜材料是一類重要的環(huán)境監(jiān)測可視材料。本文采用層層自組裝(LBL)的方法構筑了有機-無機LDHs納米超薄膜CXT/LDH,同時該薄膜對于有機揮發(fā)性有毒氣體硝基苯具有可重復性熒光響應。結構和形貌測試表明此薄膜表面連續(xù)致密,同時具有垂直于基底方向的周期性層狀結構。AFM和SEM測試表明此薄膜具有周期性結構的每層厚度為25nm左右,同時也證明了該薄膜具有均勻的表面形貌。此外,CXT/LDH超薄膜表現(xiàn)出對NB氣體的快速可視熒光檢測響應,并且具有低至4.02ppb的檢測限,良好的可重復性以及較高的選擇性。通過與合適的熒光客體香豆素-6結合,該薄膜也能夠拓展到雙色熒光體系,并表現(xiàn)出對NB氣體同時具有熒光強度變化和比率熒光的特性,這表明這些薄膜可以作為一類新的固態(tài)熒光傳感器。因此,本論文提供了一種層層自組裝方法來制備新型熒光超薄膜材料,并探討了其對NB氣體的熒光檢測行為。2、通過水相法合成了巰基丁二酸保護的CdTe量子點,并通過與硝酸根鎂鋁LDHs的共混組裝,制備了具有不同熒光發(fā)射的量子點LDHs復合物,并對其結構和形貌進行表征,同時研究了微觀尺寸上該復合物所表現(xiàn)出的熒光六方晶片結構。進一步研究,我們通過層層自組裝的方法,制備了具有不同熒光發(fā)射的量子點LDHs薄膜,通過紅色和綠色顏色熒光量子點與藍色熒光的CXT交替組裝,制備了具有白光發(fā)射的超薄膜。最后,我們通過膠體LDHs與量子點溶液進行共混組裝制備了不同熒光發(fā)射的量子點膠體LDHs復合物,并且研究發(fā)現(xiàn)壓力對其熒光強度具有一定的猝滅行為。
[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.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：O641.3;TB34

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本文編號：2056150