Size‐dependent SERS enhancement of colloidal silver nanoplates: the case of 2‐amino‐5‐nitropyridine

Abstract

Surface-enhanced Raman scattering (SERS) spectra of 2-amino-5-nitropyridine (ANP) adsorbed on colloidal silver triangular nanoplates were obtained using samples with different mean sizes and surface plasmon frequencies. The relative SERS enhancement factor for each sample was determined by the analysis of the normalized SERS excitation profiles of ANP vibrational modes for nanoplates in suspension, without aggregation. The SERS profiles are blue-shifted in relation to the localized surface plasmon peak. The detailed characterization of both morphology and concentration of the samples in addition to a rigorous normalization of the SERS spectra allowed a quantitative correlation between the SERS profiles and the mean size of the nanoplates. This correlation indicated the existence of an optimum size of the nanoplates for maximum Raman enhancement.

Multifunctional Au‐Coated TiO2 Nanotube Arrays as Recyclable SERS Substrates for Multifold Organic Pollutants Detection

“…However, the Raman bands at 1092 cm − 1 , assigned to stretch modes involving C-Cl bonds and C-C bonds, are shifted in the enhanced SERS bands to 1077 cm − 1 because of the interpretation of SERS spectra of chemisorbed species, which depend on the direction of the local electrical fi eld at the molecular adsorption site and the molecular orientation with respect to the nanostructure surface. [ 45 ] The Raman spectrum of the pure substrate shows that the substrate is very clean because there are no additional linking molecules existing in the fi nal composites as impurities when Au nanoparticles are deposited into TTA. The clean substrate is very Based on the experimental results above, we propose a hypotheses that the recyclable SERS substrate is the best candidate to detect several types of molecules.…”

Growth of silver-coated gold nanoshells with enhanced linear and nonlinear optical responses

“…3f determined by DLS suitable than BDT/Au/SiO 2 for using as SERS probe. In addition, it is known that the size of the nanoparticles is an important parameter of the field enhancement which has been studied in detail (Sant'Ana et al 2009;Amendola and Meneghetti 2012;Shaw et al 2013). Because the average size of Ag/BDT/Au/SiO 2 nanoshells is larger than that of BDT/Au/SiO 2 nanoshells, the size enlargement will also lead to the SERS enhancement.…”

Recent advances in linear and nonlinear Raman spectroscopy. Part IV

“…Membrane material providing a controllable roughened surface for the in situ nucleation and growth of polyelectrolyte silver multilayers that yielded high SERS activity and high reproducibility was reported by Zhou et al [6] SERS spectra of 2-amino-5-nitropyridine (ANP) on colloidal silver triangular nanoplates were measured by Sant'Ana et al using samples with different mean sizes and surface plasmon frequencies. [7] Here, detailed characterization of morphology and concentration allowed a quantitative correlation between the SERS profiles and the mean size of the nanoplates. Wang et al [8] report on gold nanoparticles labeled by Raman reporters that were assembled on glass and used as the seeds for in situ growth of silver-coated nanostructures.…”