Stoerzinger Kelsey A, Lin Julia Y, Odom Teri W
Department of Material Science and Engineering, Northwestern University, Evanston, IL, 60208-3113, USA.
Chem Sci. 2011 Aug 1;2(8):1435-1439. doi: 10.1039/C1SC00125F.
This Perspective reviews a new class of surface-enhanced Raman scattering (SERS) nanoparticle substrates defined by their three-dimensional (3D) confinement of localized electromagnetic fields. First, we describe the critical design parameters and recent advances in nanofabrication to create reproducible nanoparticle assemblies for SERS. Next, we highlight a promising platform-gold nanopyramids-for testing how the local arrangement of particles in an assembly affects the overall SERS response. The dimensions and optical properties of the nanopyramids can be tuned easily, and their unique anisotropic shape allows them to be organized into different particle configurations with 3D Raman-active volumes. Because of their large hot-spot volumes, this unique class of nanoparticle substrates offers an attractive alternative for ultra-sensitive sensors and trace chemical analysis.
这篇展望文章综述了一类新型的表面增强拉曼散射（SERS）纳米颗粒基底，这类基底由其对局部电磁场的三维（3D）限制所定义。首先，我们描述了用于制造可重现的用于SERS的纳米颗粒组件的关键设计参数和纳米制造的最新进展。接下来，我们重点介绍一个有前景的平台——金纳米金字塔，用于测试组件中颗粒的局部排列如何影响整体SERS响应。纳米金字塔的尺寸和光学性质可以很容易地调节，并且它们独特的各向异性形状使它们能够被组织成具有3D拉曼活性体积的不同颗粒构型。由于其大的热点体积，这类独特的纳米颗粒基底为超灵敏传感器和痕量化学分析提供了有吸引力的替代方案。
