Growth of Silver Colloidal Particles Obtained by Citrate Reduction To Increase the Raman Enhancement Factor

Abstract

A method is reported for obtaining silver colloids with a large particle size. It is based on the growth of seed colloidal particles obtained by chemical reduction of silver nitrate with citrate. These colloids were characterized by means of UV-visible spectroscopy and transmission electron microscopy. The nucleation mechanism is discussed on the basis of the morphology and size of the resulting particles. Moreover, the surface-enhanced Raman scattering activity of the resulting colloids was evaluated in the near-infrared region by using 1,5-dimethylcytosine as adsorbate.

Advances in Surface-Enhanced Fluorescence

“…More homogeneous and slightly smaller metal particles can be achieved with deposition of metal colloids on the surface. This results in particles with a 20-30nm diameter [62][63][64][65]. We observed that under carefully controlled experimental conditions, it is possible to achieve particle aggregates of metal colloids on the substrate surface.…”

Silver Nanoparticles – Universal Multifunctional Nanoparticles for Bio Sensing, Imaging for Diagnostics and Targeted Drug Delivery for Therapeutic Applications

“…Organics like sodium citrate, ascorbic acid and amino acids capable of being oxidized also used as alternate methods, (Rivas et al, 2001;Zhu Shiguo et al, 2002). All the silver nanoparticles preparations showed partical size of 20-25nm.…”

Surface-enhanced Raman scattering of silver-gold bimetallic nanostructures with hollow interiors

“…From the originally used metal electrode 15,16 to metal colloid systems, [17][18][19] the researches about SERS-active substrate have been explored extensively to develop much higher enhancement ability and stability. Silver and gold colloids are most frequently employed metallic systems in SERS.…”