Spectrophotometric Observations of the Adsorption of Organosulfur Compounds on Colloidal Silver Nanoparticles

Abstract

A silver colloid (mean particle size 6 nm) is prepared via photochemical reduction of Ag+ ions. After total silver ion reduction, the colloid exhibits an extraordinarily intense surface plasmon absorption band. The absorption band is strongly damped by small concentrations of carbon disulfide, thiophenol, and diethyl disulfide. Carbon disulfide is irreversibly adsorbed, and so is diethyl disulfide. The irreversible adsorption is attributed to the high reactivity of the nanoparticles due to their low Fermi level potential. It is proposed that this in turn leads to dissociative adsorption of the disulfides onto the silver particles. Weaker damping is observed for thiophene, thiourea, and diethyl sulfide. The damping of the plasmon absorption band is attributed to the electronic distortion of a thin layer within the particle by the adsorbate−particle interaction.

Sensing behavior of silica-coated Au nanoparticles towards nitrobenzene

“…This complex formation is believed to cause the damping of surface plasmon resonance due to gold core. The exact mechanism by which this occurs is not known, but the literature suggests the possibility of an increase in the imaginary part of the dielectric constant of gold [27][28][29]. The adsorption of NB introduces a thin layer of with the modified electron density on gold cores which produces a damping effect on SPR.…”

Chemical Synthesis, Structure Characterization, and Optical Properties of Hollow PbSx–Solid Au Heterodimer Nanostructures

“…Because of the well-known strong interaction between gold and sulfur, the excessive sulfur would induce the electron transfer and then reduce the electron mobility inside the gold nanoparticles, which then results in the damping or extinction of the SPR peak from the UV/Vis absorption spectra of the hybrid. [29,30] This fact provides evidence for the strong interaction between Au and Figure 5. TEM images of the products obtained by using different amounts of the Au I species.…”

Synthesis of Silver Nanoparticle: A New Analytical Approach for the Quantitative Assessment of Adrenaline

“…One of the most widely used nanoparticles for spectrometric enhancement is the silver nanoparticle (AgNP) due to its useful optical and catalytic properties. [1][2][3] In addition to the antibacterial activities, the application of AgNPs as an analytical sensor for biological fluids has received widespread acceptance. 4 Various methods have been reported in the literature for the synthesis of AgNPs.…”