本文選題：聚(苯乙烯-N-異丙基丙烯酰胺)納米粒子 + 光子晶體��； 參考：《東華大學(xué)》2014年碩士論文

【摘要】：光子晶體是兩種或兩種以上介質(zhì)材料周期排列的人工晶體,由于其特殊周期性結(jié)構(gòu)的布拉格衍射而具有光子禁帶的特性,從而可以對特定頻率光的傳播進(jìn)行調(diào)控,在新型光學(xué)器件方面具有廣闊的應(yīng)用前景。光子晶體特殊的性質(zhì),使其在熒光增強(qiáng)方面有一定的應(yīng)用。本文采用無皂乳液聚合法,制備了單分散的聚(苯乙烯-N-異丙基丙烯酰胺)(P(St-NIPAm))核殼納米粒子；熒光染料羅丹明B(RhB)與P(St-NIPAm)納米粒子混合,然后采用垂直沉積法,在載玻片上自組裝成摻雜RhB的P(St-NIPAm)納米粒子光子晶體薄膜,研究該薄膜對熒光增強(qiáng)效應(yīng)的影響規(guī)律。本文主要的研究內(nèi)容與結(jié)論如下： (1)采用一步無皂乳液聚合法,以過硫酸銨為引發(fā)劑,固定反應(yīng)單體的摩爾比,通過調(diào)節(jié)反應(yīng)單體的用量,制備不同粒徑單分散的P(St-NIPAm)納米粒子。結(jié)果表明,P(St-NIPAm)納米粒子呈單分散、球形,且具有明顯的核殼結(jié)構(gòu)；納米粒子的粒徑與反應(yīng)單體用量呈線性關(guān)系；P(St-NIPAm)納米粒子的聚合機(jī)理與均相成核理論基本吻合。 (2)采用垂直沉積法,P(St-NIPAm)納米粒子在載玻片上自組裝成光子晶體薄膜。結(jié)果表明,薄膜中納米粒子呈面心立方結(jié)構(gòu)緊密堆積,薄膜厚度約8μm,納米粒子層數(shù)約為50層。薄膜的光子禁帶位于可見光波段,其實(shí)驗(yàn)測量值與理論計(jì)算值基本一致,且與納米粒子粒徑呈線性關(guān)系；不同粒徑納米粒子制得的薄膜分別顯示為藍(lán)紫、藍(lán)綠、黃綠、橘紅色。 (3)根據(jù)以上結(jié)論,基于熒光染料RhB的光譜特點(diǎn),確定反應(yīng)單體的用量,合成粒徑分別為280.7、284.1、288.7nm的P(St-NIPAm)納米粒子,并采用垂直沉積法,自組裝得帶隙處于RhB激發(fā)和發(fā)射波長的光子晶體薄膜；熒光染料RhB與P(St-NIPAm)納米粒子混合,然后采用垂直沉積法,在載玻片上自組裝成摻雜RhB的P(St-NIPAm)納米粒子光子晶體薄膜。結(jié)果表明,光子晶體薄膜的光子帶隙與RhB發(fā)射波長一致時,能夠提高RhB的熒光強(qiáng)度,當(dāng)帶隙同時覆蓋RhB的激發(fā)和發(fā)射波長時,其熒光強(qiáng)度進(jìn)一步提高近一倍。然而,本文中P(St-NIPAm)納米粒子光子晶體薄膜對RhB的熒光增強(qiáng),并沒達(dá)到其它文獻(xiàn)所報(bào)道的極高增強(qiáng)效果,其原因還有待后續(xù)的研究。
[Abstract]:Photonic crystal is an intraocular crystal with two or more kinds of dielectric materials arranged periodically. Because of its special periodic Bragg diffraction, it has the characteristic of photonic band gap, so it can regulate the propagation of light at a specific frequency. It has a wide application prospect in new optical devices. The special properties of photonic crystals make them useful in fluorescence enhancement. In this paper, monodisperse poly (styrene-N-isopropylacrylamide) core-shell nanoparticles were prepared by soap-free emulsion polymerization. The photonic crystal thin films doped with RhB were self-assembled on glass substrates, and the effect of the films on the fluorescence enhancement was studied. The main contents and conclusions of this paper are as follows: 1) One-step soap-free emulsion polymerization with ammonium persulfate as initiator, the molar ratio of reactive monomer was fixed, and the monodisperse Pu St-NIPA nanoparticles with different particle sizes were prepared by adjusting the amount of reactive monomer. The results show that the nanoparticles are monodisperse, spherical and have obvious core-shell structure, and the polymerization mechanism of the nanoparticles is in good agreement with the homogeneous nucleation theory. (2) Photonic crystal thin films were self-assembled on glass substrates by vertical deposition method. The results show that the nanocrystalline particles in the films are packed tightly with a face-centered cubic structure. The thickness of the films is about 8 渭 m, and the number of layers is about 50. The photonic band gap of the thin films is located in the visible light band, and the experimental values are in good agreement with the theoretical calculated values, and there is a linear relationship between the measured values and the size of nanoparticles, and the films prepared by different particle sizes show blue and purple, blue and green, yellow and green, and orange respectively. (3) according to the above conclusion and based on the spectral characteristics of fluorescent dye RhB, the amount of reactive monomer was determined, the particle size of Pu St-NIPA was 280.7284.1nm and 288.7nm, respectively, and the vertical deposition method was used. Photonic crystal films with band gap at RhB excitation and emission wavelengths were self-assembled, and photonic crystal films doped with RhB were self-assembled on glass substrates by mixing fluorescent dye RhB with Pu St-NIPA nanoparticles. The results show that the photonic band gap of the photonic crystal film can increase the fluorescence intensity of RhB when the photonic band gap is the same as the emission wavelength of RhB. When the band gap covers the excitation and emission wavelengths of RhB, the fluorescence intensity of the photonic crystal film is further doubled. However, in this paper, the fluorescence enhancement of RhB by photonic crystal thin films of PhanSt-NIPA nanoparticles has not reached the very high enhancement effect reported in other literatures, and the reasons need to be studied in the future.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB383.2;O734

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