Thiosalicylic acid-functionalized silver nanoparticles synthesized in one-phase system

Area of Science:

• Colloidal chemistry
• Nanomaterials science
• Surface chemistry

Background:

• Silver nanoparticles (AgNPs) exhibit unique optical and electronic properties.
• Controlling nanoparticle size and distribution is crucial for their applications.
• Synthesis protocols significantly influence nanoparticle characteristics.

Purpose of the Study:

• To investigate the impact of synthesis protocols on silver nanoparticle formation.
• To compare the characteristics of silver nanoparticles prepared by simultaneous versus successive addition of reagents.
• To elucidate the relationship between synthesis parameters and resulting nanoparticle properties.

Main Methods:

• Preparation of silver colloidal dispersions using two distinct protocols.
• Characterization using Transmission Electron Microscopy (TEM) for size and morphology.
• Analysis via electrochemical measurements, X-ray Photoelectron Spectroscopy (XPS), UV-visible (UV-vis) spectroscopy, and Fourier-Transform Infrared (FT-IR) spectroscopy.

Main Results:

• Simultaneous addition of reductant (sodium borohydride) and stabilizer (thiosalicylic acid) yielded bimodal size distributions of silver nanoparticles.
• Successive addition of reagents resulted in monodisperse silver nanoparticles.
• UV-vis spectra confirmed TEM observations regarding particle size distributions.
• Electrochemical measurements supported the proposed mechanism linking reduction potential to particle size variance.
• XPS and FT-IR spectroscopy provided compositional information for thiosalicylic acid-derived silver nanoparticles.

Conclusions:

• The order of reagent addition critically affects silver nanoparticle size distribution.
• Variations in reduction potential due to different protocols influence particle diameter and distribution.
• The study provides insights into tailoring silver nanoparticle synthesis for specific applications.