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Three-Dimensional and Time-Ordered Surface-Enhanced Raman Scattering Hotspot Matrix
文献类型：期刊论文
| 作者 | Liu, HL ; Yang, ZL ; Meng, LY ; Sun, YD ; Wang, J ; Yang, LB ; Liu, JH ; Tian, ZQ |
| 刊名 | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
 |
| 出版日期 | 2014 |
| 卷号 | 136期号:14页码:5332—5341 |
| 关键词 | PLASMON RESONANCE POROUS-MEDIA HOT-SPOTS SPECTROSCOPY NANOPARTICLES SERS ARRAYS MOLECULES DIMERS |
| ISSN号 | 0002-7863 |
| 通讯作者 | lbyang@iim.ac.cn ; jhliu@iim.ac.cn |
| 英文摘要 | The "fixed" or "flexible" design of plasmonic hotspots is a frontier area of research in the field of surface-enhanced Raman scattering (SERS). Most reported SEAS hotspots have been shown to exist in zero-dimensional point-like, one-dimensional linear, or two-dimensional planar geometries. Here, we demonstrate a novel three-dimensional (3D) hotspot matrix that can hold hotspots between every two adjacent particles in 3D space, simply achieved by evaporating a droplet of citrate-Ag sols on a fluorosilylated silicon wafer. In situ synchrotron-radiation small-angle X-ray scattering (SR-SAXS), combined with dark-field microscopy and in situ micro-UV, was employed to explore the evolution of the 3D geometry and plasmonic properties of Ag nanoparticles in a single droplet. In such a droplet, there is a distinct 3D geometry with minimal polydispersity of particle size and maximal uniformity of interparticle distance, significantly different from the dry state. According to theoretical simulations, the liquid adhesive force promotes a closely packed assembly of particles, and the interparticle distance is not fixed but can be balanced in a small range by the interplay of the van der Waals attraction and electrostatic repulsion experienced by a particle. The "trapping well" for immobilizing particles in 3D space can result in a large number of hotspots in a 3D geometry. Both theoretical and experimental results demonstrate that the 3D hotspots are predictable and time-ordered in the absence of any sample manipulation. Use of the matrix not only produces giant Raman enhancement at least 2 orders of magnitude larger than that of dried substrates, but also provides the structural basis for trapping molecules. Even a single molecule of resonant dye can generate a large SERS signal. With a portable Raman spectrometer, the detection capability is also greatly improved for various analytes with different natures, including pesticides and drugs. This 3D hotspot matrix overcomes the long-standing limitations of SERS for the ultrasensitive characterization of various substrates and analytes and promises to transform SERS into a practical analytical technique. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000334572200034 |
| 公开日期 | 2015-03-13 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/14509]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 推荐引用方式 GB/T 7714 | Liu, HL,Yang, ZL,Meng, LY,et al. Three-Dimensional and Time-Ordered Surface-Enhanced Raman Scattering Hotspot Matrix[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2014,136(14):5332—5341. |
| APA | Liu, HL.,Yang, ZL.,Meng, LY.,Sun, YD.,Wang, J.,...&Tian, ZQ.(2014).Three-Dimensional and Time-Ordered Surface-Enhanced Raman Scattering Hotspot Matrix.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,136(14),5332—5341. |
| MLA | Liu, HL,et al."Three-Dimensional and Time-Ordered Surface-Enhanced Raman Scattering Hotspot Matrix".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 136.14(2014):5332—5341. |
入库方式： OAI收割
来源：上海应用物理研究所
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