Preparation, Optimization, and Characterization of SERS Sensor Substrates Based on Two-Dimensional Structures of Gold Colloid

Abstract

International audienceGenerally, the immobilization of two-dimensional nanoparticles in immersion procedures is time-consuming (over 24 h). In this paper, we report a very effective and simple method to fabricate two-dimensional gold nanoparticle patterns over large areas with high regularity for surface-enhanced Raman scattering (SERS). We achieved a highly sensitive SERS colloid surface by optimizing temperature and immersion time. The surfaces were characterized by X-ray photoelectron spectroscopy, UV-Vis, atomic force microscopy, and scanning electron microscopy. The SERS activity of surfaces was compared by using two techniques: "dip" and "dip and dry" in an aqueous solution of 10(-6) M crystal violet. The influence of the morphology of the surface was investigated with both the dip and dip and dry techniques

Electrospray surface-enhanced Raman spectroscopy (ES-SERS) for probing surface chemical compositions of atmospherically relevant particles

“…In the present study, V ranging between 1.9 and 2.3 kV was used for electrospraying. The dispersion of SERS nanoparticles and their interaction with analyte molecules determine the enhancement behavior (Ko et al, 2008;Oh et al, 2009;Addison and Brolo, 2006;Makiabadi et al, 2010;Sun et al, 2011). Therefore, Ag nanoparticles in the suspension, in the gas phase and deposited on the substrate were characterized.…”

Nanostructured and nanopatterned gold surfaces: application to the surface-enhanced Raman spectroscopy

“…The adsorption spectra show a single maximum at 520 nm in aqueous medium. This absorption band results when the incident photon frequency is resonant with the collective oscillation of the conduction band electrons and is known as the SPR [30,31]. Figure 3a(b-d) shows the extinction spectra of substrates after the immobilization of nanoparticles for different soaking times (3,30, and 60 min) in the colloidal solution of AuNPs.…”

Gold Nanoparticles as Probes for Nano-Raman Spectroscopy: Preliminary Experimental Results and Modeling

“…A colloidal solution is obtained from a mixture of chloroauric acid solution (HAuCl 4 ) and a trisodium citrate solution (Na 3 C 6 H 5 O 7 ) [11]. A Dynamic Light Scattering (DLS) experiment revealed that the diameter of the nanoparticules was about 15 nm.…”

“…Note that the intensity of the electromagnetic field strongly depends on the nanoparticle size, shape, and interparticle distance. Such high enhancement factors are also obtained from well-defined nanostructures, like nanoparticles [9][10][11], nanoholes [12] or nanotips [13]. Hence, Tip-Enhanced Raman Spectroscope (TERS) [14][15][16][17][18][19] exploits this effect induced by a nanotip, derived from the local probe microscopy techniques, among the Atomic Force Microscopy (AFM) is the most notorious example.…”