【摘要】：納米材料因為其獨特的特性而引起廣泛的關(guān)注,其中的量子點(QDs)可用于生物標(biāo)記和光電器件,太陽能電池以及環(huán)境工程等諸多領(lǐng)域。而硅球則是比較理想的載體,可以用于醫(yī)學(xué)載體,高硅玻璃,結(jié)構(gòu)陶瓷,色譜柱子等。但是普通納米微米硅球的粒徑和孔徑比較小。將極小的硅球組裝在大的基質(zhì)上,則形成納米微米復(fù)合材料則可以有效解決這個問題,并且可用其裝載量子點,有潛在的激光發(fā)射應(yīng)用前景。本文分為三部分,第一部分合成高質(zhì)量的量子點。采用熱注入法,通過改變反應(yīng)時間和調(diào)整配體比例,以及更換反應(yīng)原料,獲得了紅黃綠三種顏色的硒化鎘(CdSe)量子點,并對其進(jìn)行了無機(jī)殼層的生長。第二部分,研究了二氧化硅實心微球和多空微球的制備。制備出了粒徑均勻,外觀良好的大粒徑(大于4 μm)和小粒徑(約60nm)二氧化硅實心微球；并且又研究了以CTAB為模板劑制備多孔微球,著重考察了加入擴(kuò)孔劑均三甲苯(TMB)和擴(kuò)孔助劑正癸烷后對產(chǎn)品孔徑的影響,得到了孔徑約4nm的介孔二氧化硅球。第三部分,在前兩部分的基礎(chǔ)上,采用層層自組裝(LBL)技術(shù),將帶負(fù)電荷的二氧化硅納米球組裝在聚二烯丙基二甲基氯化銨(PDDA)修飾過的帶正電的PS大球上,合成了帶有大粒徑和大孔徑的聚苯乙烯(PS)@二氧化硅核殼型微球。在LBL組裝過程中,檢測Zeta電勢,粒徑,微球外觀以確保二氧化硅納米球的成功組裝。最終,含有5μm的PS實心核和350nm厚的二氧化硅多孔殼的核殼型微球用于負(fù)載如前所述的量子點,測試證明這種核殼型微球可以給量子點提供足夠的空間,并且可能應(yīng)用于納米微米復(fù)合物的進(jìn)一步研究中。
[Abstract]:Nanomaterials have attracted wide attention because of their unique properties. Quantum dot (QDs) can be used in many fields such as biomarkers, photovoltaic devices, solar cells and environmental engineering. The silica ball is an ideal carrier, which can be used as medical carrier, high silica glass, structural ceramics, chromatographic column and so on. However, the particle size and pore size of ordinary nanometer-sized silicon spheres are relatively small. The formation of nanometer-micron composites by assembling tiny silicon spheres onto large substrates can effectively solve this problem, and it can be used to load quantum dots, which has a potential prospect of laser emission applications. This paper is divided into three parts. The first part is the synthesis of high quality quantum dots. By changing the reaction time, adjusting the ratio of ligands and replacing the raw materials, (CdSe) QDs of red, yellow and green colors were obtained by thermal injection, and the hull-free QDs were grown. In the second part, the preparation of silica solid microspheres and multi-space microspheres were studied. Large (> 4 渭 m) and small (about 60nm) silica solid microspheres with uniform particle size and good appearance were prepared. The preparation of porous microspheres using CTAB as template was also studied. The effects of the addition of (TMB) and n-decane on the pore size of the product were investigated. The mesoporous silica spheres with a pore size of about 4nm were obtained. In the third part, on the basis of the first two parts, the negatively charged silica nanospheres were assembled on a positively charged PS ball modified by (PDDA). Polystyrene (PS) @ silica core-shell microspheres with large particle size and large pore size were synthesized. In the process of LBL assembly, Zeta potential, particle size and appearance of microspheres were detected to ensure the successful assembly of silica nanospheres. Finally, core-shell microspheres containing 5 渭 m PS solid nuclei and 350nm thick silica porous shells are used to load the previously described quantum dots. It is proved that the core-shell microspheres can provide sufficient space for quantum dots. And it may be used in the further study of nano-micron composites.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.1

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