title: High-density metallic nanogaps fabricated on solid substrates used for surface enhanced Raman scattering.
abstract: 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.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
authors.forename: Gang
authors.initials: G
authors.lastname: Lu
authors.forename: Hai
authors.initials: H
authors.lastname: Li
authors.forename: Shixin
authors.initials: S
authors.lastname: Wu
authors.forename: Peng
authors.initials: P
authors.lastname: Chen
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang