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Mechanism of Surface-Enhanced Raman Scattering and Its Application to Highly Sensitive Protein Detection 被引量:2
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作者 Ozaki Y Itoh T +3 位作者 Yoshida K Kitahama Y Han X X Zhao B 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2009年第2期396-398,共3页
Surface-enhanced resonance Raman scattering(SERRS)has recently attracted great interest in analytical science due toenormous enhancement factors that have decreased the detec-tionli mits of a wide variety of molecules... Surface-enhanced resonance Raman scattering(SERRS)has recently attracted great interest in analytical science due toenormous enhancement factors that have decreased the detec-tionli mits of a wide variety of molecules to the single moleculelevel.The SERRS-electromagnetic(EM)model describessingle-molecule SERRS 展开更多
关键词 共振拉曼散射 电磁群 电磁波 单分子灵敏度
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Surface-enhanced Raman scattering properties of highly ordered self-assemblies of gold nanorods with different aspect ratios 被引量:1
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作者 时雪钊 申承民 +5 位作者 王登科 李晨 田园 徐桎川 王春明 高鸿钧 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第7期312-318,共7页
Gold nanorods with aspect ratios of from 1 (particles) to 31.6 were synthesized by the seed-mediated method and packed in a highly ordered structure on a large scale on silicon substrates through capillary force ind... Gold nanorods with aspect ratios of from 1 (particles) to 31.6 were synthesized by the seed-mediated method and packed in a highly ordered structure on a large scale on silicon substrates through capillary force induced self-assembly behaviour during solvent evaporation. The gold nanorod surface exhibits a strong enhancing effect on Raman scattering spectroscopy. The enhancement of Raman scattering for two model molecules (2-naphthalenethiol and rhodamine 6C) is about 5-6 orders of magnitude. By changing the aspect ratio of the Au nanorods, we found that the enhancement factors decreased with the increase of aspect ratios. The observed Raman scattering enhancement is strong and should be ascribed to the surface plasmon coupling between closely packed nanorods, which may result in huge local electromagnetic field enhancements in those confined junctions. 展开更多
关键词 gold nanorods surface plasmon resonance self assemble surface enhanced raman scattering
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Comparison of Surface-enhanced Raman Scattering Spectra of Two Kinds of Silver Nanoplate Films
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作者 TAO Jin-long TANG Bin +2 位作者 XU Shu-ping PAN Ling-yun XU Wei-qing 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第3期488-492,共5页
Surface-enhanced Raman scattering(SERS) spectra of different silver nanoplate selt-assembled tllmS at different excitation wavelengths were fairly compared. Shape conversion from silver nanoprisms to nanodisks on sl... Surface-enhanced Raman scattering(SERS) spectra of different silver nanoplate selt-assembled tllmS at different excitation wavelengths were fairly compared. Shape conversion from silver nanoprisms to nanodisks on slides was in situ carried out. The SERS spectra of 4-mercaptopyridine(4-MPY) on these anisotropic silver nanopar- ticle self-assembled films present that strong enhancement appeared when the excitation line and the surface plasmon resonance(SPR) band of silver substrate overlapped. In this model, the influence of the crystal planes of silver na- noplates on SERS enhancement could be ignored because the basal planes were nearly unchanged in two kinds of silver nanoplate self-assembled films. 展开更多
关键词 surface-enhanced raman scattering(SERS) surface plasmon resonance(SPR) Shape-dependant Silvernanoprism Silver nanodisk
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Surface Plasmon Resonance Sensors Based on Polymer Optical Fiber
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作者 Rong-Sheng Zheng Yong-Hua Lu Zhi-Guo Xie Jun Tao Kai-Qun Lin Hai Ming 《Journal of Electronic Science and Technology of China》 2008年第4期357-360,共4页
Surface Plasmon Resonance (SPR) is a powerful technique for directly sensing in biological studies, chemical detection and environmental pollution monitoring. In this paper, we present polymer optical fiber applicat... Surface Plasmon Resonance (SPR) is a powerful technique for directly sensing in biological studies, chemical detection and environmental pollution monitoring. In this paper, we present polymer optical fiber application in SPR sensors, including wavelength interrogation surface enhanced Raman scattering SPR sensor and surface enhanced Raman scattering (SERS) probe. Long-period fiber gratings are fabricated on single mode polymer optical fiber (POF) with 120 μm period and 50% duty cycle. The polarization characteristic of this kind of birefringent grating is studied. Theoretical analysis shows it will be advantageous in SPR sensing applications. 展开更多
关键词 Optical fiber gratings polymer optical fiber surface plasmon resonance surface plasmon wave(SPW) surface enhanced raman scattering.
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Surface-enhanced Raman scattering(SERS)based on surface plasmon resonance coupling techniques
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作者 Shuping XU Yu LIU +1 位作者 Haibo LI Weiqing XU 《Frontiers of Chemistry in China》 2011年第4期341-354,共14页
Surface plasmon resonance(SPR)can provide a remarkably enhanced electromagetic field around metal surface.It is one of the enhancement models for explaining surface-enhanced Raman scattering(SERS)phonomenon.With the d... Surface plasmon resonance(SPR)can provide a remarkably enhanced electromagetic field around metal surface.It is one of the enhancement models for explaining surface-enhanced Raman scattering(SERS)phonomenon.With the development of SERS theories and techniques,more and more studies referred to the configurations of the optical devices for coupling the excitation and radiation of SERS,including the prism-coupling,waveguide-coupling,and grating-coupling modes.In this review,we will summarize the recent experimental improvements on the surface plasmoncoupled SERS. 展开更多
关键词 surface-enhanced raman scattering(SERS) electromagnetic field surface plasmon resonance(SPR) metal film GRATING
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Laser irradiation induced spectral evolution of the surface-enhanced Raman scattering(SERS) of 4-tert-butylbenzylmercaptan on gold nanoparticles assembly 被引量:1
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作者 TONG LianMing ZHU Tao LIU ZhongFan 《Science China Chemistry》 SCIE EI CAS 2007年第4期520-525,共6页
The spectral evolution of the surface-enhanced Raman scattering (SERS) of 4-tert-butylbenzylmer-captan (4-tBBM) on gold nanoparticles assembly under laser irradiation is reported. The relative intensities of typical p... The spectral evolution of the surface-enhanced Raman scattering (SERS) of 4-tert-butylbenzylmer-captan (4-tBBM) on gold nanoparticles assembly under laser irradiation is reported. The relative intensities of typical peaks in the spectrum of 4-tBBM gradually change with irradiation time. Comparison of the rate of spectral changes under several experimental conditions indicates that the surface plasmon resonance (SPR) induced heat in the gold nanoparticles assembly is the origin of the spectral evolution. During the process of self-assembly, 4-tBBM molecules do not form a compact ordered monolayer because of the spatial hindrance of the 4-tert-butyl end group. The heat induced by laser irradiation drives the 4-tBBM molecules to rearrange to a more stable orientation. 展开更多
关键词 surface-enhanced raman scattering(SERS) spectral evolution surface plasmon resonance(SRP) thermal effect
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Single-site surface-enhanced Raman scattering beyond spectroscopy 被引量:1
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作者 Mai Takas Satoshi Yasuda Kei Murakoshi 《Frontiers of physics》 SCIE CSCD 2016年第2期19-30,共12页
Recent progress in the observation of surface-enhanced Raman scattering (SERS) is reviewed to examine the possibility of finding a novel route for the effective photoexcitation of materials. The importance of well-c... Recent progress in the observation of surface-enhanced Raman scattering (SERS) is reviewed to examine the possibility of finding a novel route for the effective photoexcitation of materials. The importance of well-controlled SERS experiments on a single molecule at a single site is discussed based on the difference in the information obtained from ensemble SERS measurements using mul- tiple active sites with an uncontrolled number of molecules. A single-molecule SERS observation performed at a mechanically controllable breaking junction with a simultaneous conductivity mea- surement provides clear evidence of the drastic changes both in the intensity and in the Raman mode selectivity of the electromagnetic field generated by localized surface plasmon resonance. Careful con- trol of the field at a few-nanometer-wide gap of a metal nanodimer results in the modification of the selection rule of electronic excitation of an isolated single-walled carbon nanotube. The examples shown in this review suggest that a single-site SERS observation could be used as a novel tool to find, develop, and implement applications of plasmon-induced photoexcitation of materials. 展开更多
关键词 surface-enhanced raman scattering localized surface plasmon resonance metalnanostructure single-molecule observation single-walled carbon nanotube selection rule ofelectronic excitation
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Silver-coated elevated bowtie nanoantenna arrays: Improving the near-field enhancement of gap cavities for highly active surface-enhanced Raman scattering 被引量:1
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作者 Lei Feng Renping Ma Yandong Wang Daren Xu Dongyang Xiao Lingxiao Liu Nan Lu 《Nano Research》 SCIE EI CAS CSCD 2015年第11期3715-3724,共10页
Improving hot-spot intensity is a key issue in surface-enhanced Raman scattering (SERS). The bowtie nanoantenna (BNA) is an effective device used to concentrate light energy into a nanoscale volume and produce str... Improving hot-spot intensity is a key issue in surface-enhanced Raman scattering (SERS). The bowtie nanoantenna (BNA) is an effective device used to concentrate light energy into a nanoscale volume and produce strong hot spots. Nanosphere lithography (NSL) is a large-area and low-cost technique to produce BNA arrays; however, the SERS activity of NSL-fabricated BNAs is limited. In this paper, we present a simple method to improve the SERS activity of conventional NSL-fabricated BNAs by modifying their geometry. The new configuration is termed "silver-coated elevated bowtie nanoantenna" (SCEBNA). SCEBNAs perform intensive near-field enhancement in the gap cavities owing to the integrated contribution of the "lightning rod" effect, resonance coupling, and the formation of the plasmonic Fabry-Perot cavity. Experimental measurements and finite-difference time-domain simulations revealed that the hot-spot intensity and the substrate enhancement factor can be optimized by adjusting the silver thickness. The optimal sample has the capability of trace-amount detection with fine reproducibility. 展开更多
关键词 surface-enhanced raman scattering (SERS) surface plasmon resonance bowtie nanoantenna nanosphere lithography gap cavity
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Modulating carrier density of the(Ag)_(x)(MoO_(3))_(y)system to enhance SERS:Localized surface plasmon resonance contribution
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作者 Lin Zhu Zhu Mao +4 位作者 Peng Li Menglei Xu Zhen Meng Lei Chen Bing Zhao 《Journal of Materiomics》 SCIE CSCD 2023年第2期387-394,共8页
Semiconductors typically exhibit long-wavelength LSPR absorption in the infrared region due to lower carrier density.Tuning the carrier density of semiconductors and blue-shifting their LSPR absorption to the visible ... Semiconductors typically exhibit long-wavelength LSPR absorption in the infrared region due to lower carrier density.Tuning the carrier density of semiconductors and blue-shifting their LSPR absorption to the visible and near-infrared region has always been a great challenge.Herein,we discussed how the controllable carrier of(Ag)x(MoO_(3))y composite influences the LSPR based on SERS test and UVeViseNIR absorption spectra.We were surprised to find that the LSPR absorption wavelength can be easily tuned from 950 to 735 nm by changing the sputtering power of MoO_(3)of the(Ag)x(MoO_(3))_(y)composite.This shows that LSPR can be precisely adjusted by increasing the semiconductor content and even the carrier density.In addition,the carrier density was measured by Hall effect to investigate the SERS intensity change caused by electromagnetic(EM)enhancement,and obtain the relationship between the two.The findings of this work provide an idea for tunable LSPR and the research of EM contributions to SERS. 展开更多
关键词 Carrier density Localized surface plasmon resonance SEMICONDUCTOR ELECTROMAGNETIC surface-enhanced raman scattering
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Influence of tip geometry on the spatial resolution of tip enhanced Raman mapping
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作者 张超 陈宝琴 李志远 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期415-422,共8页
In 2013,a breakthrough experiment pushed the Raman mapping of molecules via the tip-enhanced Raman scattering(TERS) technique to a sub-nanometer spatial resolution,going into the single-molecule level.This surprisin... In 2013,a breakthrough experiment pushed the Raman mapping of molecules via the tip-enhanced Raman scattering(TERS) technique to a sub-nanometer spatial resolution,going into the single-molecule level.This surprising result was well explained by accounting for the critical role of elastic molecule Rayleigh scattering within a plasmonic nanogap in enhancing both the localization and the intensity level of the Raman scattering signal.In this paper,we theoretically explore the influence of various geometric factors of the TERS system on the spatial resolution of Raman mapping,such as the tip curvature radius,tip conical angle,tip–substrate distance,and tip–molecule vertical distance.This investigation can help to find out the most critical geometric factor influencing the spatial resolution of TERS and march along in the right direction for further improving the performance of the TERS system. 展开更多
关键词 tip-enhanced raman scattering rayleigh scattering surface plasmon resonance
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Synthesis and Raman Performance Enhancement of Multilayer AuAg Heterostructures with Magnetic Resonance
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作者 HUANG Fan ZHAO Zhirui +2 位作者 FENG Jingru MA Liang DING Sijing 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2023年第4期351-358,共8页
Significant amplification of surface enhanced Raman scattering(SERS)signals can be achieved mainly by the electric field enhancement in metal core-shell nanostructures,and the enhanced magnetic field is rarely studied... Significant amplification of surface enhanced Raman scattering(SERS)signals can be achieved mainly by the electric field enhancement in metal core-shell nanostructures,and the enhanced magnetic field is rarely studied.In this study,we prepared multi-gap Au/AgAu core-shell hybrid nanostructures by using gold nanocup as the core.The overgrowth processes to grow one,two,and three layers of AgAu hybrid nanoshells can produce Au/AgAu^(1),Au/AgAu^(2),and Au/AgAu^(3) heteronanostructures.The strong plasmon coupling between the core and shell leads to significant electromagnetic field enhancement.Under the synergistic effect of electromagnetic plasmon resonance and plasmon coupling,Au/AgAu core-shell hybrid nanostructures exhibit excellent SERS signals.We also investigate the effect of the interstitial position of the rhodamine B(RhB)molecule on Raman enhancement in Au/AgAu~3 heteronanostructures.This study can provide new ideas for the synthesis of multi-gap Raman signal amplifiers based on magnetic plasmon coupling. 展开更多
关键词 Au/AgAu core-shell hybrid nanostructures magnetic plasmon resonance plasmon coupling surface enhanced raman scattering(SERS)
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基于棱镜型消逝场耦合增强拉曼/荧光原位光谱检测系统
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作者 曹修冕 赵军毅 +3 位作者 霍泽鹏 徐抒平 王文全 徐蔚青 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2023年第S01期189-190,共2页
为解决单一技术在表界面过程研究中的局限性,发展多技术协同配合的综合探测装置具有重要意义。该研究使用Kretschmann棱镜激发银膜表面等离激元极化子(SPP),并在银膜表面修饰具有拉曼及荧光活性的目标分子。利用分子对表面电磁场的散射... 为解决单一技术在表界面过程研究中的局限性,发展多技术协同配合的综合探测装置具有重要意义。该研究使用Kretschmann棱镜激发银膜表面等离激元极化子(SPP),并在银膜表面修饰具有拉曼及荧光活性的目标分子。利用分子对表面电磁场的散射和吸收,将近场的能量重新发射到远场,实现探测。基于该技术,搭建了一套原位融合表面等离激元共振(SPR)光谱、表面增强拉曼散射(SERS)、表面等离激元增强荧光的检测系统,用于实现高灵敏的表界面事件监控及光谱分析功能,并以Cy5.5@SiO_(2)@AuNP@4MBA荧光拉曼双探针为标准样品对仪器功能进行验证。该装置在动态调控等离激元器件,生物传感与检测,界面光电催化等领域均有很多潜在应用。 展开更多
关键词 表面等离激元共振 表面增强拉曼散射 全内反射荧光显微镜
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等离激元二聚体局域表面光学性质创新实验的教学实践 被引量:2
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作者 田媛媛 张波 《大学物理实验》 2023年第2期59-61,共3页
以科研为基础引导开展创新性实验教学,本文以等离激元二聚体的局域表面光学性质的研究为例,将科学研究的热点融入到大学生创新性实验项目中,研究不同尺寸的纳米结构对应的局域表面等离子体共振和表面增强拉曼散射的光谱性质。通过将创... 以科研为基础引导开展创新性实验教学,本文以等离激元二聚体的局域表面光学性质的研究为例,将科学研究的热点融入到大学生创新性实验项目中,研究不同尺寸的纳米结构对应的局域表面等离子体共振和表面增强拉曼散射的光谱性质。通过将创新研究与实验教学结合,激发学生的科研兴趣,加强学生学科交叉的意识,提升学生的创新思维和科研素养。 展开更多
关键词 创新实验 教学实践 二聚体 局域表面等离子体共振 表面增强拉曼
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用双还原法制备三角形银纳米片及其光学性能 被引量:12
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作者 赖文忠 赵威 +1 位作者 杨容 李星国 《物理化学学报》 SCIE CAS CSCD 北大核心 2010年第4期1177-1183,共7页
在硼氢化钠和柠檬酸三钠共存的体系中还原硝酸银,以聚乙烯吡咯烷酮(PVP)为表面活性剂和保护剂,水浴加热制备得到三角形银纳米片,用X射线衍射(XRD)、透射电子显微镜(TEM)、紫外-可见(UV-Vis)吸收光谱、表面增强拉曼散射(SERS)光谱对其进... 在硼氢化钠和柠檬酸三钠共存的体系中还原硝酸银,以聚乙烯吡咯烷酮(PVP)为表面活性剂和保护剂,水浴加热制备得到三角形银纳米片,用X射线衍射(XRD)、透射电子显微镜(TEM)、紫外-可见(UV-Vis)吸收光谱、表面增强拉曼散射(SERS)光谱对其进行了表征.结果表明:三角形银纳米片产物为立方相金属银,边长为(100±40)nm,厚度为(10±5)nm;产物表现出与球形银纳米粒子完全不同的吸收光谱;柠檬酸根在银晶核不同晶面的选择吸附、PVP的包覆作用及Ag(111)晶面的层错对产物的形成起决定作用;与球形纳米颗粒相比,三角形银纳米片膜对吡啶(Py)分子有显著的SERS活性. 展开更多
关键词 双还原法 三角形银纳米片 生长机理 表面等离子共振 表面增强拉曼散射光谱
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铑电极在紫外区的表面增强拉曼散射机理 被引量:6
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作者 杨志林 吴德印 +2 位作者 任斌 周海光 田中群 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2004年第6期682-685,共4页
采用波长为 32 5nm的He Cd激光为激发光源 ,首次在粗糙铑电极上获得了高质量的表面增强拉曼信号。基于在紫外区获得SERS信号这一进展 ,以电磁场理论为基础 ,分别从定性和定量的角度对此新的实验结果做了理论分析。分析表明 ,在紫外区获... 采用波长为 32 5nm的He Cd激光为激发光源 ,首次在粗糙铑电极上获得了高质量的表面增强拉曼信号。基于在紫外区获得SERS信号这一进展 ,以电磁场理论为基础 ,分别从定性和定量的角度对此新的实验结果做了理论分析。分析表明 ,在紫外区获得的铑的SERS信号主要源自于有着特定形貌的铑纳米粒子所引起的避雷针效应及微弱的表面等离子体共振效应的共同作用。对铑纳米粒子的表面平均SERS增强因子的计算结果与实验值较为一致 ,约为两个数量级。我们同时比较分析了在可见光及近红外区有着极佳SERS增强效应的银基底在采用 32 5nm激发光时却得不到任何SERS信号这一实验结果 。 展开更多
关键词 铑电极 表面增强拉曼散射 避雷针效应 表面等离子体共振效应 紫外区
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帽状银纳米粒子的制备及表面增强拉曼活性研究 被引量:6
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作者 肖桂娜 满石清 +1 位作者 刘应亮 孟建新 《无机化学学报》 SCIE CAS CSCD 北大核心 2007年第10期1738-1742,共5页
采用真空热蒸发法在自组装的单层阵列二氧化硅纳米粒子表面沉积银膜制备了帽状银纳米粒子。通过透射电镜(TEM)、扫描电镜(SEM)和紫外-可见-近红外分光光度计(UV-Vis-NIR)对其表面形貌及光学性质进行了表征。以吡啶-(2-偶氮-4)间苯二酚... 采用真空热蒸发法在自组装的单层阵列二氧化硅纳米粒子表面沉积银膜制备了帽状银纳米粒子。通过透射电镜(TEM)、扫描电镜(SEM)和紫外-可见-近红外分光光度计(UV-Vis-NIR)对其表面形貌及光学性质进行了表征。以吡啶-(2-偶氮-4)间苯二酚作为探针分子,研究了该复合纳米粒子的表面增强拉曼散射(SERS)活性,增强因子高达2.88×106。结果表明在二氧化硅纳米粒子表面制备的帽状银纳米粒子是很好的表面增强拉曼散射活性基底。 展开更多
关键词 银纳米帽 表面等离子共振 吡啶-(2-偶氮-4)间苯二酚 表面增强拉曼散射
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受纳米结构损伤限制的光纤拉曼探头SERS探测灵敏度 被引量:2
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作者 廖艳林 张腊梅 +2 位作者 刘晔 曹杰 毛庆和 《量子电子学报》 CAS CSCD 北大核心 2013年第3期348-353,共6页
利用光线追迹法,研究了典型光纤拉曼探头在纳米结构损伤限制下收集到的表面增强拉曼散射(SERS)功率与样品位置之间的关系。结果表明,对于不同焦距构成的同轴等光程光纤拉曼探头,在给定的纳米结构损伤阈值激发光功率密度下,样品偏离焦平... 利用光线追迹法,研究了典型光纤拉曼探头在纳米结构损伤限制下收集到的表面增强拉曼散射(SERS)功率与样品位置之间的关系。结果表明,对于不同焦距构成的同轴等光程光纤拉曼探头,在给定的纳米结构损伤阈值激发光功率密度下,样品偏离焦平面反而会使探头收集到的SERS功率增加,相比于样品远离探头方向偏离焦平面,靠近探头方向偏离焦平面时收集到的SERS功率更高。此外,收集光纤芯径越大,探头所收集的SERS功率越大。 展开更多
关键词 光谱学 表面增强拉曼散射 光纤拉曼探头 损伤 局域表面等离子振荡
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帽状铜纳米粒子的制备及表面增强拉曼散射活性研究 被引量:7
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作者 满石清 肖桂娜 《无机化学学报》 SCIE CAS CSCD 北大核心 2009年第7期1279-1283,共5页
采用真空热蒸发法在SiO2纳米粒子自组装单层膜上沉积铜薄膜制备了帽状铜纳米粒子。用扫描电镜、原子力显微镜和紫外-可见-近红外分光光度计对帽状复合纳米粒子的表面形貌和光学性质进行了表征。以亚甲基蓝和吡啶-(2-偶氮-4)间苯二酚为... 采用真空热蒸发法在SiO2纳米粒子自组装单层膜上沉积铜薄膜制备了帽状铜纳米粒子。用扫描电镜、原子力显微镜和紫外-可见-近红外分光光度计对帽状复合纳米粒子的表面形貌和光学性质进行了表征。以亚甲基蓝和吡啶-(2-偶氮-4)间苯二酚为探针分子,研究了该复合纳米粒子的表面增强拉曼散射(SERS)活性。通过比较吸附在不同基底上的吡啶-(2-偶氮-4)间苯二酚的谱峰强度,探讨了SERS效应与表面等离子体共振(SPR)的关系。 展开更多
关键词 SIO2纳米粒子 帽状铜纳米粒子 表面等离子体共振 表面增强拉曼散射
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帽状金纳米结构的制备、表征及表面增强拉曼散射活性 被引量:7
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作者 肖桂娜 满石清 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2009年第5期849-854,共6页
采用真空离子溅射法在自组装的单层阵列二氧化硅纳米粒子表面沉积金薄膜,制备了以S iO2为核的帽状金纳米结构.用透射电镜、扫描电镜、原子力显微镜、X射线衍射仪和紫外-可见-近红外分光光度计对样品的表面形貌、结构及光学性质进行了表... 采用真空离子溅射法在自组装的单层阵列二氧化硅纳米粒子表面沉积金薄膜,制备了以S iO2为核的帽状金纳米结构.用透射电镜、扫描电镜、原子力显微镜、X射线衍射仪和紫外-可见-近红外分光光度计对样品的表面形貌、结构及光学性质进行了表征.以亚甲基蓝作为探针分子,对金纳米帽的表面增强拉曼散射活性进行了研究,结果显示,吸附在金纳米帽上的分子拉曼散射信号得到显著增强,增强因子达到107数量级.该基底在超灵敏生物和化学检测方面具有潜在的应用前景. 展开更多
关键词 二氧化硅纳米粒子 帽状金纳米结构 表面等离子体共振 亚甲基蓝 表面增强拉曼散射
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Triangular Au-Ag framework nanostructures prepared by multi-stage replacement and their spectral properties 被引量:1
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作者 易早 张建波 +5 位作者 陈艳 陈善俊 罗江山 唐永建 吴卫东 易有根 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第9期2049-2055,共7页
Triangular Au-Ag framework nanostructures (TFN) were synthesized via a multi-step galvanic replacement reaction (MGRR) of single-crystalline triangular silver nanoplates in a chlorauric acid (HAuCl4) solution at... Triangular Au-Ag framework nanostructures (TFN) were synthesized via a multi-step galvanic replacement reaction (MGRR) of single-crystalline triangular silver nanoplates in a chlorauric acid (HAuCl4) solution at room temperature. The morphological, compositional, and crystal structural changes involved with reaction steps were analyzed by using transmission electron microscopy(TEM), energy-dispersive X-ray spectrometry (EDX), and X-ray diffraction. TEM combined with EDX and selected area electron diffraction confirmed the replacement of Ag with Au. The in-plane dipolar surface plasmon resonance (SPR) absorption band of the Ag nanoplates locating initially at around 700 nm gradually redshifted to 1 100 nm via a multi-stage replacement manner after 7 stages. The adding amount of HAuCl4 per stage influenced the average redshift value per stage, thus enabled a fine tuning of the in-plane dipolar band. A proposed formation mechanism of the original Ag nanoplates developing pores while growing Au nanoparticles covering this underlying structure at more reaction steps was confirmed by exploiting surface-enhanced Raman scattering (SERS). 展开更多
关键词 triangular Au-Ag framework nanostructures multi-stage galvanic replacement reaction surface plasmon resonance surface-enhanced raman scattering
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