本文選題：LSPR　切入點：納米結(jié)構(gòu)　出處：《東北石油大學(xué)》2017年博士論文

【摘要】：基于金屬及其復(fù)合結(jié)構(gòu)納米顆粒局域表面等離子體共振(LSPR)特性的光學(xué)傳感測試技術(shù)在石油勘探開發(fā)領(lǐng)域具有巨大的應(yīng)用潛力,金屬復(fù)合結(jié)構(gòu)納米顆粒的LSPR由于具有共振光譜可控性和功能多樣化的特點獲得廣泛關(guān)注。為了給新型LSPR納米復(fù)合結(jié)構(gòu)的設(shè)計和“油氣光學(xué)”新傳感測試方法提供理論依據(jù),本論文從局域表面等離子體共振基本原理出發(fā),采用仿真方法對金基納米復(fù)合結(jié)構(gòu)LSPR光學(xué)特性進(jìn)行系統(tǒng)研究。對具有不同中間層的Au-中間層-Ag三層核殼納米顆粒的LSPR消光特性進(jìn)行仿真分析。采用離散偶極近似方法和有限元數(shù)值方法,分析了中間層材料、核殼比以及外界介質(zhì)折射率等結(jié)構(gòu)參數(shù)對其消光效率和LSPR共振波長的影響;分析結(jié)果表明,消光峰峰位與各層厚度、外界介質(zhì)折射率變化有關(guān),對中間層材料的變化極為敏感。中間層材料對三層納米核殼的LSPR特性有顯著影響,當(dāng)中間層為空腔時,消光光譜中存在三個共振吸收峰及法諾共振現(xiàn)象。Ni中間層抑制了金核對核殼結(jié)構(gòu)LSPR的貢獻(xiàn),消光譜中只存在一個共振峰,未形成法諾共振。Si3N4中間層對表面等離子體共振具有明顯的增強作用,導(dǎo)致消光譜中出現(xiàn)多個共振峰;通過改變金核的半徑可優(yōu)化LSPR法諾共振波長和強度,實現(xiàn)在600~1200nm波長范圍內(nèi)調(diào)控。提出了一種新型對稱破缺型Au-ITO-Ag三層納米核殼結(jié)構(gòu)模型,采用有限元計算方法和等離激元雜化理論研究了入射光偏振方向和入射光頻率等參數(shù)對LSPR共振能量模式及其遠(yuǎn)場分布的影響及變化規(guī)律;結(jié)果表明,當(dāng)入射光偏振方向垂直和平行于對稱軸方向時,Au內(nèi)核能量模式與Ag外殼納米杯能量模式的相互作用可產(chǎn)生多個偶極和高階共振模式。入射光波頻率在一定范圍內(nèi)變化時,實現(xiàn)了對橫向和軸向兩個耦合模式LSPR光譜的分別控制;與吸收和消光曲線相比,散射譜線的能量模式均發(fā)生藍(lán)移,且吸收效率大于散射效率,共振吸收在消光性能中占主導(dǎo)作用。電場輪廓增強分析表明,Ag外殼納米杯缺口部分具有最突出的電場強度和高度可調(diào)節(jié)的光學(xué)特性。設(shè)計了一種Au/石墨烯基底復(fù)合Ag納米棒陣列結(jié)構(gòu),采用離散偶極近似算法研究了Ag納米棒長軸方向、石墨烯層厚度、納米棒高度、共振波長以及Ag納米棒個數(shù)等參數(shù)對納米復(fù)合結(jié)構(gòu)共振波長和電場分布特性的影響。仿真結(jié)果表明,當(dāng)Ag納米棒長軸平行于y軸時,納米復(fù)合結(jié)構(gòu)消光光譜存在三個等離子體共振模式,且長波長共振模式隨石墨烯層厚度的增大發(fā)生顯著藍(lán)移。石墨烯層厚度對LSPR特性有顯著影響,納米復(fù)合結(jié)構(gòu)的共振特性可通過控制石墨烯厚度進(jìn)行調(diào)整和優(yōu)化。LSPR的能量模式所對應(yīng)的共振峰峰位隨Ag納米棒的高度不同發(fā)生變化,且與Ag納米棒的縱橫比有密切關(guān)系。隨著等離子體共振波長增大,電場強度大幅度增加;對于八個Ag納米棒的復(fù)合結(jié)構(gòu),當(dāng)波長為800nm時,電場強度比入射電場增強70倍。Ag納米棒之間局域電磁場相互作用,導(dǎo)致Ag納米棒具有極強的分子拉曼信號,該現(xiàn)象可用于近場信號的放大和檢測。外界介質(zhì)折射率的微小變化導(dǎo)致Au/石墨烯基底復(fù)合Ag納米棒陣列結(jié)構(gòu)的LSPR共振條件發(fā)生變化,該響應(yīng)關(guān)系可為制備更高活性的SERS活性基底折射率傳感器提供理論支撐。本文系統(tǒng)地研究了金基納米復(fù)合結(jié)構(gòu)LSPR光學(xué)特性,揭示了結(jié)構(gòu)參數(shù)與消光效率及LSPR共振波長之間內(nèi)在關(guān)系,提出了一種光學(xué)特性高度可調(diào)的新型對稱破缺型Au-ITO-Ag三層納米核殼結(jié)構(gòu)模型,設(shè)計了一種新型Au/石墨烯基底復(fù)合Ag納米棒陣列結(jié)構(gòu),本文的研究成果對光纖傳感器表面功能化修飾及納米復(fù)合光學(xué)傳感器設(shè)計具有理論指導(dǎo)和實踐意義。
[Abstract]:The metal nanoparticles and their composite structures based on localized surface plasmon resonance (LSPR) optical sensing technology characteristics have great potential applications in the field of petroleum exploration and development, metal composite structure LSPR nanoparticles because of the resonance spectrum of controllability and functional diversification gained wide attention. In order to design the new LSPR nano composite structure and "oil gas optical" new sense test methods provide a theoretical basis, the basic principle of localized surface plasmon resonance of the simulation method used to systematically study the gold based nano composite structure of LSPR optical properties. Simulation analysis of LSPR extinction characteristic of the middle layer of Au- -Ag three core-shell nanoparticles with different intermediate layer of using the discrete dipole approximation method and numerical method of finite element analysis, intermediate layer materials, core-shell ratio and external refractive index Influence of structural parameters on the rate of extinction efficiency and LSPR resonance wavelength; the analysis results show that the extinction peak position and thickness of each layer, the external refractive index changes, the change of interlayer material is very sensitive. LSPR significantly affected the properties of the intermediate layer material of three layer nanometer nuclear shell, when the middle layer as the cavity, the three resonance absorption peak and Fano resonance phenomenon of.Ni intermediate layer suppresses the gold to check the core-shell structure of LSPR with extinction spectrum, a resonance peak exists only in the extinction spectrum, intermediate Fano resonance.Si3N4 layer on surface plasmon resonance is greatly enhanced by the formation, resulting in multiple resonance peaks extinction spectrum; by changing the radius of the nucleus can optimize LSPR Fano resonance wavelength and intensity, realized in the wavelength range of 600~1200nm regulation. We put forward a new symmetry breaking type Au-ITO-Ag three layer core-shell structure. Type, plasmon hybridization theory on the polarization direction of the incident light and incident light frequency parameters of LSPR resonance energy mode and the far field distribution of influence and change law of the finite element method and etc.; results show that when the polarization direction of the incident light parallel and perpendicular to the direction of the symmetry axis, the interaction energy of Au kernel mode with the Ag shell nano cup pattern of energy can produce a plurality of dipole and higher order resonance modes. The incident wave frequency changes within a certain range, can control the transverse and axial two coupling modes in LSPR spectra; compared with the absorption and extinction curves, scattering spectrum energy patterns are blue shifted, and the absorption efficiency is larger than the scattering resonance absorption efficiency, which plays a dominant role in the extinction performance. Field contour enhancement analysis showed that the Ag shell nano gap cup portion has electric field strength of the most prominent and highly adjustable Optical characteristics. The design of a Au/ graphene composite substrate Ag nanorod array structure, using the discrete dipole of Ag nanorods long axis algorithm approximate, graphene layer thickness, nanorod height, parametric resonance wavelength and the number of the Ag nanorods nanocomposite structure resonance wavelength and field distribution characteristics were investigated. The simulation results show that when the Ag nanorods long axis parallel to the Y axis, there are three modes of plasmon resonance extinction spectra and nano composite structure, the long wavelength resonant mode with increasing graphene layer thickness has a significant blue shift. The graphene layer thickness on the characteristics of LSPR have a significant effect, resonance peak resonance characteristics of nano composite structure can be controlled by graphene the thickness of the adjustment and optimization of the.LSPR energy model corresponding to the level of different Ag nanorods changed, and the aspect ratio of the Ag nanorods have a close relationship with. The plasmon resonance wavelength increases, the electric field strength increased greatly; for the composite structure of eight Ag nanorods, when the wavelength is 800nm, the electric field strength than the incident electric field enhanced 70 times between.Ag nanorods localized electromagnetic interaction, resulting in Ag nanorods have strong molecular Raman signal, this phenomenon can be used for near-field signal amplification and detection of small changes in the outside world. The refractive index of the medium lead to changes in the LSPR resonance conditions of Au/ graphene composite substrate Ag nanorod array structure, the response relation for the preparation of SERS active substrate reflects a high activity rate sensor provides theoretical support. This paper systematically studied the optical properties of gold based nano composite structure of LSPR revealed the relationship between the structure parameters and the extinction efficiency and LSPR resonance wavelength, proposes a novel symmetrical optical characteristics of height adjustable breaking type Au-ITO-Ag three nanometer nuclear shell A new type of Au/ graphene based composite Ag nanorod array structure is designed. The research results in this paper have theoretical guidance and practical significance for the functional modification of optical fiber sensor and the design of nano composite optical sensor.

【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TE151;O657.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 張敬萍;付光杰;呂靖薇;劉超;王金玉;牟海維;;對稱性破缺Au-ITO-Ag納米核殼的光學(xué)特性研究[J];兵器材料科學(xué)與工程;2017年03期

2 付光杰;張敬萍;呂靖薇;王金玉;劉超;牟海維;;Au-中間層-Ag納米核殼的法諾共振特性研究[J];兵器材料科學(xué)與工程;2017年01期

3 曹q;鄭改革;吳義根;徐波波;;銀納米棒雙體結(jié)構(gòu)的表面等離子體共振光學(xué)特性研究[J];光散射學(xué)報;2015年02期

4 李志遠(yuǎn);李家方;;金屬納米結(jié)構(gòu)表面等離子體共振的調(diào)控和利用[J];科學(xué)通報;2011年32期

5 郭學(xué)濤;孔令富;張運生;祁瑞麗;;基于光纖傳感器的油氣水三相流持氣率測井儀[J];電子技術(shù);2010年02期

6 劉志強,李小斌,彭志宏,童斌,劉桂華;濕化學(xué)法制備超細(xì)粉末過程中的團聚機理及消除方法[J];化學(xué)通報;1999年07期

7 周芳德，，陳學(xué)俊，陳宣政;油氣水三相流截面相份額光纖探針／電導(dǎo)探針組合測量技術(shù)[J];西安交通大學(xué)學(xué)報;1995年08期

相關(guān)博士學(xué)位論文 前1條

1 陳星星;金屬納米顆�！∧ゑ詈舷到y(tǒng)的光學(xué)特性研究及其應(yīng)用[D];浙江大學(xué);2016年

相關(guān)碩士學(xué)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(xué);2015年

2 菅曉光;貴金屬納米粒子光學(xué)性質(zhì)的研究[D];吉林大學(xué);2011年

本文編號：1690768