本文選題：表面等離子體共振 + 貴金屬納米粒子�。� 參考：《東北石油大學》2015年碩士論文

【摘要】：表面等離子體共振技術(shù)(Surface Plasmon Resonance,SPR)是近年來非常熱門的新型光學傳感技術(shù),它對介質(zhì)折射率的微小變化極其敏感,具有測量精度高、易實現(xiàn)傳感器微型化、樣品無需標記和無背景干擾等諸多優(yōu)點,在生物醫(yī)學、食品安全檢測、石油化學等領(lǐng)域應(yīng)用前景廣闊。SPR傳感特性與貴金屬的納米結(jié)構(gòu)有密切聯(lián)系,材料的微觀結(jié)構(gòu)、納米晶粒尺寸、形狀對局域光譜特性有顯著影響。本文首先介紹SPR傳感技術(shù)及金屬納米顆粒的研究現(xiàn)狀和發(fā)展趨勢,然后基于表面等離子體共振傳感模型,采用離散偶極近似方法對多種尺寸、形狀、結(jié)構(gòu)金屬納米粒子的SPR現(xiàn)象進行仿真。在仿真中,針對不同尺寸的單個球形、棒狀、立方體形的納米粒子以及兩個、四個、八個球形納米粒子不同排列結(jié)構(gòu),分析其對應(yīng)的消光光譜,闡明納米粒子結(jié)構(gòu)對消光光譜的響應(yīng)規(guī)律。研究結(jié)果表明,隨著貴金屬納米粒子尺寸的增大,消光光譜共振波長發(fā)生紅移,且共振峰強度增強,納米粒子的共振波長與粒子尺寸近似呈線性關(guān)系。研究還發(fā)現(xiàn),不同形狀單個納米粒子形狀越尖銳,靈敏度越高;直線排列結(jié)構(gòu)的球形納米粒子消光光譜隨尺寸變化的規(guī)律與單個納米粒子隨尺寸變化的規(guī)律相同,但隨粒子個數(shù)的增加,紅移變化量降低;此外,平面排列結(jié)構(gòu)的球形納米粒子消光光譜有多個共振峰,隨粒子尺寸的增大,共振峰均紅移,且共振強度均逐漸增強,后一個共振峰總比前一個共振峰的紅移變化量大,共振強度增幅亦較大;隨著平面排列結(jié)構(gòu)粒子個數(shù)的增多,共振強度也有所增強,并且球形納米粒子立方體結(jié)構(gòu)的消光光譜與平面排列結(jié)構(gòu)的消光光譜變化規(guī)律相同。上述研究結(jié)果能夠為表面等離子體共振傳感器的設(shè)計和優(yōu)化提供理論指導。
[Abstract]:Surface Plasmon Resonance technique (SPR) is a new type of optical sensing technology, which is very popular in recent years. It is very sensitive to the tiny change of refractive index of medium, has high measuring precision and is easy to realize the miniaturization of sensors.The sample has many advantages, such as no marking and no background interference. It has a broad application prospect in biomedicine, food safety detection, petroleum chemistry and so on. The sensing properties of SPR are closely related to the nanostructures of precious metals, and the microstructure of materials.The size and shape of nanocrystalline grains have a significant effect on the local spectral properties.In this paper, the research status and development trend of SPR sensing technology and metal nanoparticles are introduced, and then based on the surface plasmon resonance sensing model, discrete dipole approximation method is used to study various dimensions and shapes.The SPR phenomenon of structural metal nanoparticles was simulated.In the simulation, the extinction spectra of single spherical, rod-shaped, cubic nanoparticles and two, four or eight spherical nanoparticles with different arrangement structures are analyzed.The response of the structure of nanoparticles to the extinction spectrum is explained.The results show that with the increase of the size of noble metal nanoparticles, the resonance wavelength of extinction spectrum is red-shifted and the intensity of resonance peak increases. The resonance wavelength of nanoparticles is approximately linearly related to particle size.It was also found that the sharper the shape of the single nanoparticles with different shapes, the higher the sensitivity, the extinction spectrum of the spherical nanoparticles with linear arrangement was the same as that of the single nanoparticles.In addition, there are many resonance peaks in the extinction spectrum of spherical nanoparticles with the increase of particle number, and the resonance peaks shift red with the increase of particle size, and the resonance intensity increases gradually.The total red shift of the latter resonance peak is larger than that of the previous resonance peak, and the increase of the resonance intensity is also larger, and the resonance intensity increases with the increase of the number of planar structured particles.The extinction spectrum of spherical nano-particle cube is the same as that of planar structure.These results can provide theoretical guidance for the design and optimization of surface plasmon resonance sensors.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.1;TP212

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相關(guān)碩士學位論文 前2條

1 柴雅婷;納米結(jié)構(gòu)金屬表面等離子體共振的理論研究[D];東北石油大學;2015年

2 王艷霞;基于SPR顯示的理論與仿真研究[D];東南大學;2005年

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本文編號：1747293