本文選題：六角星型納米顆粒 + 六角花瓣納米顆粒��； 參考：《四川師范大學(xué)》2017年碩士論文

【摘要】：金屬納米顆粒由于其獨(dú)特的局域表面等離子體共振(LSPR)性質(zhì),會(huì)呈現(xiàn)出一定的消光特性和局域場(chǎng)增強(qiáng)�；谶@種性質(zhì),金屬納米顆�？梢员粦�(yīng)用于LSPR傳感、納米波導(dǎo)和表面增強(qiáng)拉曼散射等多個(gè)領(lǐng)域。對(duì)于LSPR傳感器,其傳感性能主要由品質(zhì)因數(shù)(FOM)體現(xiàn),品質(zhì)因數(shù)越高,傳感性能越好。而品質(zhì)因數(shù)與折射率靈敏度(RIS)和消光光譜的半高全寬(FWHM)直接相關(guān),要得到好的品質(zhì)因數(shù),就要獲得高的折射率靈敏度和窄的半高全寬。影響金屬納米顆粒LSPR性質(zhì)的因素包括材料、尺寸、形狀、排列方式以及周?chē)橘|(zhì)的折射率等。近年來(lái),人們從各個(gè)方面研究了金屬納米顆粒的LSPR性質(zhì)和傳感性能。無(wú)論是在理論計(jì)算上,還是在工藝制備技術(shù)方面都取得了顯著的成果。但實(shí)驗(yàn)條件的限制,導(dǎo)致許多良好的理論成果難以實(shí)現(xiàn)。因此,本文在已有實(shí)驗(yàn)結(jié)果的基礎(chǔ)上,提出了一種新型的六角金屬納米顆粒,用CST Microwave Studio仿真軟件對(duì)其LSPR性質(zhì)及傳感性能進(jìn)行研究。論文的主要工作和結(jié)果如下:1.研究頂角角度對(duì)六角星型Ag納米顆粒LSPR性質(zhì)和傳感性能的影響。計(jì)算結(jié)果表明,當(dāng)納米顆粒的厚度和橫截面積不變時(shí),頂角角度逐漸從o20增大到o140,消光光譜的峰值波長(zhǎng)藍(lán)移,消光強(qiáng)度減弱。頂角角度的變化對(duì)折射率靈敏度的影響很大,但對(duì)消光光譜半高全寬的影響較小。當(dāng)角度為o30時(shí),折射率靈敏度達(dá)最大值1164 nm/RIU,品質(zhì)因數(shù)為9.86 RIU~(-1)。實(shí)驗(yàn)中,經(jīng)常無(wú)法達(dá)到理想的頂角角度,對(duì)于這種鈍化情況,研究發(fā)現(xiàn),隨著頂角鈍化程度的增加,品質(zhì)因數(shù)相應(yīng)減小,傳感性能減弱。2.研究六角花瓣納米顆粒的LSPR性質(zhì)和傳感性能。本論文首先計(jì)算了實(shí)驗(yàn)上容易實(shí)現(xiàn)的三明治(Ag/Mg F2/Ag)六角花瓣納米顆粒的消光光譜。結(jié)果表明,隨著介質(zhì)層厚度的逐漸增大,短波長(zhǎng)共振峰紅移,而長(zhǎng)波長(zhǎng)共振峰藍(lán)移;由上下金屬層之間強(qiáng)烈的近場(chǎng)耦合導(dǎo)致的電場(chǎng)共振逐漸增強(qiáng),磁場(chǎng)共振逐漸減弱;當(dāng)介質(zhì)層厚度為80 nm時(shí),納米顆粒的消光光譜只出現(xiàn)一個(gè)共振峰,此時(shí)半高全寬最小,獲得的折射率靈敏度和品質(zhì)因數(shù)分別為332 nm/RIU和3.91 RIU~(-1)。雖然改變介質(zhì)層厚度可以調(diào)控LSPR光譜的峰值波長(zhǎng),但獲得的傳感性能并不理想。因此,為了獲得更好的品質(zhì)因數(shù),本文計(jì)算了單層Ag六角花瓣納米顆粒的消光光譜,并研究了其傳感性能。通過(guò)對(duì)厚度和幾何尺寸的一系列優(yōu)化,折射率靈敏度能夠達(dá)到668 nm/RIU,品質(zhì)因數(shù)約為15 RIU~(-1)。
[Abstract]:Due to its unique local surface plasmon resonance (LSP) properties, metal nanoparticles exhibit a certain extinction characteristic and local field enhancement. Based on this property, metal nanoparticles can be used in many fields such as LSPR sensing, nano-waveguide and surface-enhanced Raman scattering. For the LSPR sensor, the sensing performance is mainly reflected by the quality factor FOM. The higher the quality factor, the better the sensing performance. However, the quality factor is directly related to the refractive index sensitivity (RIS) and the half maximum full width (FWHM) of the extinction spectrum. In order to obtain a good quality factor, a high refractive index sensitivity and a narrow half height full width must be obtained. The factors affecting the LSPR properties of metal nanoparticles include material, size, shape, arrangement and refractive index of surrounding media. In recent years, the LSPR properties and sensing properties of metal nanoparticles have been studied from various aspects. Remarkable achievements have been made in both theoretical calculation and process preparation technology. However, due to the limitation of experimental conditions, many good theoretical results are difficult to achieve. Therefore, based on the experimental results, a novel hexagonal metal nanoparticles is proposed in this paper. The LSPR properties and sensing properties are studied by CST Microwave Studio simulation software. The main work and results are as follows: 1. The effect of vertex angle on LSPR properties and sensing properties of hexagonal Ag nanoparticles was investigated. The calculated results show that when the thickness and cross-sectional area of the nanoparticles are constant, the angle of the peak angle increases from o20 to o140, the peak wavelength of the extinction spectrum shifts blue and the extinction intensity weakens. The change of the angle of the vertex has a great influence on the sensitivity of refractive index, but has little effect on the full width of the extinction spectrum. When the angle is o30, the refractive index sensitivity reaches the maximum value of 1164 nm / r IUU, and the quality factor is 9.86 RIU-1g. In the experiment, the ideal angle can not be achieved. For this passivation, it is found that with the increase of the degree of passivation, the quality factor decreases and the sensing performance weakens. The LSPR properties and sensing properties of hexagonal petal nanoparticles were studied. In this paper, the extinction spectra of hexagonal petal nanoparticles are calculated. The results show that with the increase of the thickness of the dielectric layer, the red shift of the short wavelength resonance peak and the blue shift of the long wavelength resonance peak, the electric field resonance caused by the strong near-field coupling between the upper and lower metal layers increases gradually, and the magnetic resonance gradually weakens. When the thickness of the dielectric layer is 80 nm, there is only one resonance peak in the extinction spectrum of the nanoparticles, and the half-height full width is the smallest, and the refractive index sensitivity and the quality factor are 332 nm / RIU and 3.91 RIU / 1 ~ (-1) respectively. Although the peak wavelength of the LSPR spectrum can be adjusted by changing the thickness of the dielectric layer, the sensing performance is not satisfactory. Therefore, in order to obtain better quality factor, the extinction spectra of monolayer Ag hexagonal petal nanoparticles were calculated and their sensing properties were studied. By optimizing the thickness and geometric size, the refractive index sensitivity can reach 668 nm / r ~ (-1), and the quality factor is about 15 ~ (-1) RIUs.
【學(xué)位授予單位】：四川師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB383.1;O485;TP212

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本文編號(hào)：1997806