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一种新型拉曼光镊探针在表面增强拉曼中的研究
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摘要
表面增强拉曼光谱(SERS)具有单分子水平的表面检测灵敏度,目前对SERS的研究主要集中在拉曼增强基底材料上,而对样品上特定位置的选择性增强则鲜有研究。我们将光镊与表面增强拉曼相结合,通过操控拉曼光镊探针实现对表面任意位置的光谱测定。在研究中,我们在SiO_2微球上修饰Ag纳米颗粒,此探针一方面可以借助光镊在溶液中进行操控;另一方面,Ag颗粒可以产生较强的电磁场,增强物质的拉曼信号。利用这个系统我们测定了固液界面上任选位置的增强拉曼信号,测得的R6G分子最低检测表面浓度为5000个/μm~2。此外,通过光镊实现两个或者多个微球的耦合,还可以直接对溶液中的低浓度物质进行检测。
Surface-enhanced Raman spectroscopy(SERS) has ultra-high surface sensitivity, even down to single-molecule level. Currently the study always focused on the Raman enhancement materials, but selective enhancement of a particular location was short. We have combined Optical Tweezers(OT) and Raman spectroscopy to obtain SERS spectrum from selective points on the surface by manipulating optically trappable probes. In our study, silver coated silica beads were prepared. This probe can be trapped in OT, and silver nanoparticles can provide strong electromagnetic field to enhance the Raman signals of analyte simultaneously. Using this system, we obtained SERS spectrum from any desirable location of the solid liquid interface. The minimum surface number density of R6G molecules have been detected was 5000/μm~2. Through trapping two or more microspheres, this system can also be used for Raman measurement of substances in low concentration solution.
引文
[1]Bálint,?.;Kreuzer,M.P.;Rao,S.;Badenes,G.The Journal of Physical Chemistry C.2009,113(41):17724-9.
    [2]Li,J.F.;Huang,Y.F.;Ding,Y.;Yang,Z.L.Nature.2010,464(7287):392-5.

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