金纳米颗粒间热点的微球辅助成像
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- 英文论文题名：Imaging of Hotspots between Nanoparticles Based on Microspheres
- 论文作者：谢梦然 ; 张鲁凝
- 英文论文作者：Mengran Xie ; Luning Zhang ; Department of Chemistry ; Tongji University
- 年：2016
- 作者机构：同济大学化学系;
- 论文关键词：微球 ; 等离基元共振 ; 双光子发光 ; 超分辨
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十五分会：纳米表征与测量
- 语种：中文
- 分类号：O614.123;TB383.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十五分会 ; 纳米表征与测量
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：314k
- 原文格式：D
- 会议级别：全国
摘要
相互接近的金纳米颗粒其局域表面等离基元被激发时可以产生耦合,在交界处显著增强电场强度。此类纳米颗粒间的热点可以作为表面增强拉曼(SERS)的增强机制对信号进行放大。借助扫描近场光学显微镜(SNOM),前人用双光子发光效应对相邻金纳米颗粒间的热点进行了成像。相比SNOM,微球对亚衍射极限尺寸的样品进行超分辨成像具有快速、简单、无需标记等特点。本研究借助微球采集样品表面的近场双光子发光信号,通过改变激发光的偏振方向,实现了对金纳米颗粒之间热点的激发和成像。该方法不仅适用于双光子发光,也可以对源于热点的拉曼信号进行成像,直观地获得样品上突破衍射极限的化学键信息。
Gold nanoparticles close to each other can produce coupling when their local surface plasmons are excited, which can significantly enhance the electric-field intensity at the junction. The hotspots between the nanoparticles as enhancement mechanism of surface enhanced Raman scattering(SERS) can amplify the signal. With the aid of scanning near-field optical microscopy(SNOM), predecessors have imaged hotspots between adjacent gold nanoparticles by two-photon luminescence(TPL) effects. The method to make super-resolution imaging of the materials with sub-diffraction limited size via microspheres is fast, simple and label-free compared to SNOM. Based on microspheres collecting near-field TPL signal produced by the sample surface, this study realized excitation and imaging of the hotspots between gold nanoparticles by changing the polarization of the laser. This method is not only applicable to the TPL, but can also imaging the Raman signal on the hotspots, which will visually obtain the chemical bond information breaking the diffraction limit of the sample.
Gold nanoparticles close to each other can produce coupling when their local surface plasmons are excited, which can significantly enhance the electric-field intensity at the junction. The hotspots between the nanoparticles as enhancement mechanism of surface enhanced Raman scattering(SERS) can amplify the signal. With the aid of scanning near-field optical microscopy(SNOM), predecessors have imaged hotspots between adjacent gold nanoparticles by two-photon luminescence(TPL) effects. The method to make super-resolution imaging of the materials with sub-diffraction limited size via microspheres is fast, simple and label-free compared to SNOM. Based on microspheres collecting near-field TPL signal produced by the sample surface, this study realized excitation and imaging of the hotspots between gold nanoparticles by changing the polarization of the laser. This method is not only applicable to the TPL, but can also imaging the Raman signal on the hotspots, which will visually obtain the chemical bond information breaking the diffraction limit of the sample.
引文
[1]Wang,Z.;Guo,W.;Li,L.;Lu’yanchuk,B.;Khan,A.;Liu,Z.;Chen,Z.;Hong,M.Nat.Commun.2011,2:218.
[2]Okamoto,H.;Imura,K.J.Mater.Chem.,2006,16:3920.
[3]Kerker,M.;Wang,D.;Chew,H.Appl.Opt.1980,19:4159.
[2]Okamoto,H.;Imura,K.J.Mater.Chem.,2006,16:3920.
[3]Kerker,M.;Wang,D.;Chew,H.Appl.Opt.1980,19:4159.