本文選題：銀納米線 + 局域表面等離激元�。� 參考：《陜西師范大學(xué)》2016年碩士論文

【摘要】：熒光光譜技術(shù)和拉曼散射光譜技術(shù)被廣泛應(yīng)用于醫(yī)學(xué)診斷、生物工程及物質(zhì)分析等領(lǐng)域。但是一般的熒光信號(hào)和拉曼散射信號(hào)較弱、穩(wěn)定性較差,限制了這兩項(xiàng)檢測(cè)技術(shù)在許多科學(xué)領(lǐng)域的應(yīng)用。隨著合成技術(shù)和微納制備技術(shù)的進(jìn)步,研究人員們發(fā)現(xiàn),將分子置于具有納米結(jié)構(gòu)的金屬表面附近,分子的熒光發(fā)射信號(hào)或者拉曼散射信號(hào)會(huì)得到明顯增強(qiáng),進(jìn)而提高了探測(cè)靈敏度。因此,表面增強(qiáng)熒光效應(yīng)和表面增強(qiáng)拉曼散射效應(yīng)應(yīng)運(yùn)而生,新型高效襯底的制備和增強(qiáng)機(jī)制的研究一直是表面增強(qiáng)工作研究的重點(diǎn)。本論文將制備的銀納米線沉積在清洗處理過(guò)的硅片上得到不同的加載密度作為增強(qiáng)襯底,系統(tǒng)的研究了不同密度的銀納米線作為襯底以及不同激勵(lì)波長(zhǎng)對(duì)熒光素鈉分子熒光增強(qiáng)效應(yīng)的影響；在此基礎(chǔ)上研究了不同密度的銀納米線作為襯底對(duì)結(jié)晶紫和若丹明-590分子的表面增強(qiáng)拉曼散射(SERS)效應(yīng)的影響,簡(jiǎn)單探討了高密度銀納米線作為襯底和單根納米線作為襯底的SERS特性。論文主要工作包括以下3個(gè)方面：1.通過(guò)乙二醇高溫?zé)徇�原的方法,簡(jiǎn)單、快速的合成了產(chǎn)量較高、相對(duì)均一的銀納米線；保持其他條件不變,討論了不同分子量的聚乙烯吡咯烷酮(PVP)對(duì)銀納米線生長(zhǎng)的影響,結(jié)果表明大分子量的PVP更有利于銀納米線的生長(zhǎng)；同時(shí)簡(jiǎn)單討論了銀納米線的生長(zhǎng)機(jī)制。2.將制備的銀納米線沉積在清洗處理過(guò)的硅片上,使其產(chǎn)生不同的密度,然后將其用作表面增強(qiáng)熒光襯底。利用制備的夾層構(gòu)型進(jìn)行光譜測(cè)量,以熒光素鈉作為熒光分子,討論了不同密度的銀納米線作為襯底以及不同激勵(lì)波長(zhǎng)對(duì)熒光素鈉熒光發(fā)射強(qiáng)度的影響。研究表明,熒光素鈉分子的熒光增強(qiáng)不僅依賴于銀納米線的加載密度而且強(qiáng)烈的依賴于激勵(lì)波長(zhǎng)。3.在532 nm波長(zhǎng)作為拉曼分析激發(fā)光下,簡(jiǎn)單的探討了不同密度的銀納米線作為襯底對(duì)結(jié)晶紫和若丹明590分子SERS效應(yīng)的影響,結(jié)果表明,高密度的銀納米線作為襯底有利于獲得更強(qiáng)的SERS信號(hào)；最后以結(jié)晶紫和若丹明-590為探針?lè)肿?討論了高密度銀納米線作為襯底和單根納米線作為襯底的SERS特性。
[Abstract]:Fluorescence spectroscopy and Raman scattering spectroscopy are widely used in medical diagnosis, bioengineering and material analysis. However, the general fluorescence signal and Raman scattering signal are weak and the stability is poor, which limits the application of these two detection techniques in many scientific fields. With advances in synthesis and nanofabrication, researchers have found that when molecules are placed near metal surfaces with nanostructures, the fluorescence emission signals or Raman scattering signals of the molecules are significantly enhanced. Furthermore, the detection sensitivity is improved. Therefore, the surface-enhanced fluorescence effect and surface-enhanced Raman scattering effect emerge as the times require. In this thesis, the silver nanowires were deposited on the cleaned silicon wafer with different loading densities as the enhancement substrates. The effects of silver nanowires with different densities as substrates and excitation wavelengths on the fluorescence enhancement of sodium fluorescein molecules were systematically studied. The effects of silver nanowires of different densities on the surface enhanced Raman scattering (SERS) effects of crystal violet and Rhodamine 590 molecules were studied. The SERS characteristics of high density silver nanowires as substrates and single nanowires as substrates are briefly discussed. The main work of the thesis includes the following three aspects: 1. Silver nanowires with high yield and relative uniformity were synthesized by the method of high temperature thermal reduction of ethylene glycol, and the effects of polyvinylpyrrolidone (PVP) with different molecular weight on the growth of silver nanowires were discussed. The results show that PVP with high molecular weight is more favorable to the growth of silver nanowires, and the growth mechanism of silver nanowires is also discussed briefly. The prepared silver nanowires were deposited on the cleaned silicon wafers to produce different densities and then used as surface enhanced fluorescent substrates. The influence of silver nanowires with different densities and excitation wavelengths on the fluorescence emission of sodium fluorescein was discussed. The results show that the fluorescence enhancement of sodium fluorescein not only depends on the loading density of silver nanowires, but also strongly depends on the excitation wavelength. 3. The effects of silver nanowires with different densities as substrates on SERS effect of crystal violet and rhodamine 590 molecule were investigated by using 532 nm wavelength as Raman excited light. The SERS characteristics of high density silver nanowires as substrate and single nanowire as substrate were discussed with crystal violet and rhodamine 590 as probe molecules.
【學(xué)位授予單位】：陜西師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TB383.1;O657.37

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