本文選題：核殼復(fù)合納米材料　切入點：銀棒　出處：《延邊大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：核殼復(fù)合納米材料主要綜合了無機(jī)材料和有機(jī)材料的優(yōu)良特性,并不是簡單的將兩種或兩種以上的組分進(jìn)行疊加,除了保證每種單獨組分的特點,而且會得到新的特征性能。銀納米棒具有獨特光學(xué)性質(zhì),具體表現(xiàn)為橫向和縱向的表面等離子共振(SPR)吸收峰。聚丁二炔(Polydiacetylene,PDA)是一類獨特的π-共軛聚合物。PDA單體在受到紫外光照下,會變成無熒光的藍(lán)色相,當(dāng)受到加熱等外部刺激時會變成有熒光信號的紅色相。正因為這種特性廣泛應(yīng)用于比色/生物傳感器。但由于PDA的熒光量子產(chǎn)率較低,阻礙了其進(jìn)一步的應(yīng)用。金屬熒光增強(qiáng)(Metal Enhanced Fluorescence,MEF)可以解決這個問題。影響MEF現(xiàn)象的因素主要有兩點,一是金屬粒子與熒光團(tuán)之間的距離在5到15 nm,二是熒光團(tuán)的發(fā)射頻率與金屬納米粒子的SPR的匹配程度。本文以晶種法合成銀納米棒,并且通過控制銀納米晶種的大小,調(diào)整加入晶種的量,改變生長液中各組分之間的濃度,生長出長徑比在2左右可調(diào)控長度的銀納米棒。PDA的激發(fā)光譜與加入30 μL的晶種所生長銀納米棒的SPR峰匹配程度最高,PDA熒光效果增強(qiáng)。通過加入NH4SCN蝕刻銀棒,得到空心的PDA殼結(jié)構(gòu),與銀棒@聚丁二炔核殼結(jié)構(gòu)相比,證實銀納米棒的存在,PDA的熒光會得到增強(qiáng)。利用靜電吸附法,合成銀棒@聚丁二炔核殼結(jié)構(gòu)。此時銀棒與PDA之間的距離較短,在3 nm左右。水熱法合成銀棒@聚丁二炔核殼結(jié)構(gòu),使銀納米棒與PDA之間的距離變大,到8 nm左右。也考察與牛血清蛋白(BSA)的結(jié)合,隨著銀棒@聚丁二炔濃度的增加,發(fā)生熒光猝滅現(xiàn)象。并得到穩(wěn)定的BSA-Ag@PDA復(fù)合物,預(yù)測這種長徑比可控的銀棒@聚丁二炔核殼結(jié)構(gòu)在生物成像等領(lǐng)域具有潛在的應(yīng)用價值。
[Abstract]:Core-shell composite nanomaterials mainly integrate the excellent properties of inorganic and organic materials, and are not simply superimposed on two or more components, except to ensure the characteristics of each individual component. The silver nanorods have unique optical properties, such as transverse and longitudinal surface plasmon resonance (SPR) absorption peaks. Poly (butylene diacetylene) PDAs are a kind of unique 蟺 -conjugated polymers. PDA monomers are exposed to ultraviolet light. It turns into a blue phase without fluorescence, and becomes a red phase with a fluorescent signal when it is stimulated by external stimuli such as heating. This property is widely used in colorimetric / biosensors, but because of the low fluorescence quantum yield of PDA, Metal fluorescence enhanced metal Enhanced fluorescence can solve this problem. There are two main factors that influence the MEF phenomenon. One is that the distance between metal particles and fluorescent groups is between 5 and 15 nm, and the other is the match between the emission frequency of fluorescent clusters and the SPR of metal nanoparticles. In this paper, silver nanorods are synthesized by the method of crystal seeding, and the size of silver nanocrystalline seeds is controlled. Adjust the amount of seed added, change the concentration of each component in the growth solution, The excitation spectra of silver nanorods grown with aspect ratio of about 2 can be adjusted to match the SPR peak of silver nanorods grown with 30 渭 L crystal seeds. The fluorescence effect of PDAs was enhanced by adding NH4SCN etched silver bars. The hollow PDA shell structure was obtained. Compared with the silver rod / polybutylene core shell structure, the fluorescence of the silver nanorods was confirmed to be enhanced. The distance between silver rod and PDA is about 3 nm. Hydrothermal synthesis of silver rod @ polybutylene core shell structure increases the distance between silver nanorods and PDA. At about 8 nm, the binding of BSA with bovine serum protein (BSA) was also investigated. With the increase of the concentration of silver bar @ polybutylene, the fluorescence quenching phenomenon occurred, and the stable BSA-Ag@PDA complex was obtained. It is predicted that this kind of silver rod / polybutylene core-shell structure with controllable aspect ratio has potential application value in biological imaging and other fields.
【學(xué)位授予單位】：延邊大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB333

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相關(guān)期刊論文 前1條

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本文編號：1591627