题 目：Strengthening Surface Plasmon Coupling to Enhance Raman Scattering
报告人：钱立华 教授
时 间：2012年5月25日（周五）下午2:30
地 点：材料楼217会议室
【报告人简介】
钱立华，华中科技大学物理学院研究员。东北大学本科,中国科学院金属研究所博士。曾经在日本东北大学材料研究所和美国内华达大学拉斯维加斯分校从事纳米多孔材料表面等离子体和表面增强拉曼散射的研究。研究领域主要包括金属纳米材料的表面等离子体和纳米结构的自组装。迄今为止，担任多个国际期刊的稿件审稿人。目前已经在国际权威学术刊物上发表论文20多篇，总引用次数超过800次。
【报告摘要】
Hot spots have the contradictively geometrical requirements for both the narrowest interstices to provide strong near-field coupling, and sufficient space to allow entrance of the analytes. Herein, two types of self-assembly techniques are developed to create the tiny gap in favor of strengthening electromagnetic field. The strategy is to introduce the molecules onto the surface of metal nanostructures, followed by the creation of nanoscale gap. These two-step methods are employed to create hot spots within hybrid nanostructures, which are self-supported nanoporous film-nanoparticle or nanoparticle arrays. The molecules confined into 1 nm interstice exhibit significant enhancement in Raman scattering. Giant enhancement primarily results from strong near-field coupling between the neighboring nanostructures, which is theoretically confirmed by finite-difference time-domain simulation. Excellent detection limits toward 10-11 mol/1 offer an opportunity to track spatial orientation of single molecule and engineer hybrid nanostructures as commercial SERS substrates.