School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Nanoscale. 2012 Feb 7;4(3):860-3. doi: 10.1039/c1nr10997a. Epub 2011 Dec 9.
The Raman signal of adsorbed molecules can be significantly enhanced by utilizing metallic structures with high-density Raman hot spots used as surface enhanced Raman scattering (SERS) substrates. In this work, we develop a simple, convenient and tunable method to fabricate high-density Ag or Au nanogaps on Si wafers. These nanogaps can serve as Raman hot spots, leading to dramatic enhancement of the Raman signal. The high-density nanogaps can be formed by repeating the electroless deposition of Ag NPs (or Au NPs) and coating of p-aminothiophenol (PATP, a Raman probe) on the deposited Ag NPs (or Au NPs) through the self-assembly process. After removal of PATP by O(2) plasma, the as-fabricated SERS substrate can be reused for the detection of other molecules.
利用具有高密度拉曼热点的金属结构作为表面增强拉曼散射 (SERS) 基底，可以显著增强吸附分子的拉曼信号。在这项工作中，我们开发了一种简单、方便且可调的方法来在硅片上制造高密度 Ag 或 Au 纳米间隙。这些纳米间隙可以作为拉曼热点，导致拉曼信号的剧烈增强。高密度纳米间隙可以通过重复进行无电沉积 Ag NPs（或 Au NPs）并通过自组装过程在沉积的 Ag NPs（或 Au NPs）上涂覆对氨基苯硫酚（PATP，拉曼探针）来形成。通过 O(2)等离子体去除 PATP 后，所制造的 SERS 基底可重复用于检测其他分子。
