Effect of layer structures of gold nanoparticle films on surface enhanced Raman scattering

• Published in: Analytica chimica acta Vol. 649; no. 1; pp. 111 - 116
• Main Authors: Oh, Min Kyung, Yun, Sukang, Kim, Seong Kyu, Park, Sungho
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2009; Elsevier
• Subjects: Analytical chemistry; Chemistry; Exact sciences and technology; Extinction spectroscopy; Gold film; Nanoparticle; Plasmon; Spectrometric and optical methods; Surface enhanced Raman scattering; Gold film; Extinction spectroscopy; Plasmon; Nanoparticle; Surface enhanced Raman scattering; Water; Monolayer; Structure effect; Gold; Multilayer; Surface Enhanced Raman Spectrometry; Hexane
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2009.07.025

Using a method of collecting nanoparticles at a water/hexane interface in a close-packed monolayer film and transferring such films onto a solid substrate, three-dimensional multilayer films of nanoparticles were formed. The packed nanoparticles were gold nanospheres (NS) with a 26 nm diameter or gold nanorods (NR) with a 31 nm diameter and 74 nm length. We investigated variations in the surface enhanced Raman scattering (SERS) intensities from such nanoparticle films as the layer compositions were changed. The films stacked with NR layers generated much higher SERS intensity than those of NS layers. The SERS intensities from both kinds of films increased as the number of layers were increased. However, when the NR layer and NS layer were stacked alternately, SERS intensity varied in a zigzag fashion. It was found that the structure of top layer plays a distinguishable role in generating strong SERS enhancement while the lower layers contribute to SERS with less dependency on structures. Interlayer coupling as well as intralayer coupling was considered in order to explain the observations.