Multilayer Structures of Self‐Assembled Gold Nanoparticles as a Unique SERS and SEIRA Substrate

• Published in: Chemphyschem 2009-05, Vol.10 (7), p.1106-1111
• Main Authors: Baia, Monica, Toderas, Felicia, Baia, Lucian, Maniu, Dana, Astilean, Simion
• Format: Article
• Language: English
• Subjects: Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Glass - chemistry; gold; Gold - chemistry; IR spectroscopy; Membranes, Artificial; Metal Nanoparticles - chemistry; Molecular Structure; nanoparticles; Particle Size; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Raman spectroscopy; self‐assembly; Spectrophotometry, Infrared - methods; Spectrum Analysis, Raman - methods; Surface physical chemistry; Surface Properties
• ISSN: 1439-4235; 1439-7641
• DOI: 10.1002/cphc.200800815

Gold deposits: Multilayer gold nanostructures deposited on a glass substrate are characterized by AFM and UV/Vis spectroscopy. Detailed analysis of the recorded spectra shows the potential of this substrate in surface‐enhanced Raman spectroscopy and surface‐enhanced IR absorption (see picture) for providing information about the adsorbed species. Metallic multilayer structures consisting of self‐assembled nanoparticles are prepared by successive immersion of a functionalized glass substrate in a gold colloidal suspension, and are characterized by UV/Vis spectroscopy and atomic force microscopy. The ability of the thin film to concomitantly enhance the Raman and IR signals of an adsorbed molecule is evaluated and a detailed analysis of the recorded spectra is provided, which emphasizes the capability of these complementary methods to provide information about the adsorbed species. This unique surface‐enhanced Raman spectroscopy (SERS) and surface‐enhanced infrared absorption (SEIRA) substrate could be further used for applications in the elucidation of the structure of a great variety of adsorbed samples. Gold deposits: Multilayer gold nanostructures deposited on a glass substrate are characterized by AFM and UV/Vis spectroscopy. Detailed analysis of the recorded spectra shows the potential of this substrate in surface‐enhanced Raman spectroscopy and surface‐enhanced IR absorption (see picture) for providing information about the adsorbed species.