【摘要】：近些年來(lái),表面增強(qiáng)拉曼散射已經(jīng)越來(lái)越受到人們的關(guān)注,由于其可以實(shí)現(xiàn)對(duì)物質(zhì)的痕量檢測(cè)。但是由于對(duì)基底制備的方法并不完善,使之限制了其更快速的發(fā)展。近些年來(lái),研究者們不斷提出新的制備思路,逐步完善改進(jìn)了這一缺陷,但是所達(dá)到的增強(qiáng)效果并不是非常顯著。大自然在一萬(wàn)年的進(jìn)化過(guò)程中形成了一些精妙的三維微結(jié)構(gòu),這些結(jié)構(gòu)可以實(shí)現(xiàn)對(duì)特定波段頻率光的響應(yīng),本文正是“師法自然”,受到大自然的啟迪,將銀納米顆粒附著在一些具有典型的蝴蝶鱗片結(jié)構(gòu)上,使之規(guī)則的排布在這樣具有特殊光響應(yīng)的結(jié)構(gòu)上,從而來(lái)實(shí)現(xiàn)對(duì)拉曼信號(hào)峰的增強(qiáng)。本文分別用綠帶翠鳳蝶和“夜光藍(lán)”蝴蝶翅膀作為基板,通過(guò)原位自生長(zhǎng)方法,成功的將納米銀金屬顆粒附著在這樣的三維微結(jié)構(gòu)上,合成了經(jīng)有序粗糙化的SERS基底。拉曼檢測(cè)結(jié)果顯示:在以綠帶翠鳳蝶為基板的增強(qiáng)基底上,可以檢測(cè)到濃度為10-14mol/L的羅丹明6G,而以“夜光藍(lán)”蝶翅為基板的增強(qiáng)基底上只能檢測(cè)到濃度為10-11mol/L的羅丹明6G。在對(duì)同等濃度為10-8mol/L的羅丹明6G的增強(qiáng)中,從信號(hào)峰強(qiáng)度上來(lái)看,這樣的三維粗糙化的要比排布在二維平板上的銀納米顆粒有顯著增強(qiáng)。在實(shí)驗(yàn)的基礎(chǔ)上,結(jié)合三維有限時(shí)域差分的計(jì)算方法(3-D FDTD),模擬研究了在這樣的微結(jié)構(gòu)上排布銀納米顆粒對(duì)周?chē)砻骐姶艌?chǎng)強(qiáng)度的影響,以及從對(duì)光利用的角度分析了綠帶翠鳳蝶增強(qiáng)效果強(qiáng)的原因。模擬計(jì)算結(jié)果表明這樣的三維微結(jié)構(gòu)經(jīng)有序粗糙化后可以使表面的電場(chǎng)強(qiáng)度有顯著增強(qiáng),數(shù)量級(jí)可以達(dá)到103。通過(guò)降低對(duì)激發(fā)光的反射,來(lái)提高其與銀納米顆粒的能量交換,繼而達(dá)到對(duì)電場(chǎng)增強(qiáng)的效果。本文為設(shè)計(jì)更高效的表面增強(qiáng)拉曼散射基底材料提供了啟迪。
[Abstract]:In recent years, surface enhanced Raman scattering has attracted more and more attention because of its ability to detect trace substances. However, the method of substrate preparation is not perfect, which limits its rapid development. In recent years, researchers put forward new preparation ideas, gradually improve the defect, but the enhancement effect is not very significant. In the course of ten thousand years of evolution, nature has formed some exquisite three-dimensional microstructures which can respond to the frequency light of a certain band. This paper is just "learning from nature", which is inspired by nature. The silver nanoparticles are attached to some typical butterfly scales, which are arranged regularly in the structure with special light response, so that the Raman signal peak can be enhanced. In this paper, the SERS substrates were synthesized by using the wings of the green belt butterflies and the "night-blue" butterflies as substrates. The silver nanoparticles were successfully attached to the three-dimensional microstructures by in situ self-growth method. Raman analysis showed that Rhodamine 6G with 10-14mol/L concentration could be detected on the enhanced substrate with green belt butterflies as substrate, while Rhodamine 6G with 10-11mol/L concentration could only be detected on enhanced substrate with "night-light blue" butterfly wings as substrate. In the enhancement of Rhodamine 6G with the same concentration of 10-8mol/L, the intensity of the signal peak shows that the three-dimensional roughening is more obvious than that of the silver nanoparticles arranged on the two-dimensional plate. On the basis of experiments, the influence of silver nanoparticles on the electric magnetic field intensity of the surrounding surface was studied by 3-D FDTD), simulation. And from the perspective of light utilization, the paper analyzes the reasons for the strong enhancement effect of the green belt butterflies. The simulation results show that the electric field intensity of the surface can be significantly enhanced by the ordered roughening of the three dimensional microstructures, and the order of magnitude can reach 103. The energy exchange with silver nanoparticles can be improved by reducing the reflection of excited light, and the effect of electric field enhancement can be achieved. This paper provides inspiration for the design of more efficient surface-enhanced Raman scattering substrates.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：O614.122;TB383.1

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