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Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method
Published on: January 15, 2012
One-pot silver nanoring synthesis.
Nicolas Drogat1, Robert Granet, Vincent Sol
1Laboratoire de Chimie des Substances Naturelles, Université de Limoges, EA 1069, 123 Avenue Albert Thomas, 87060, Limoges, France. robert.granet@unilim.fr.
Nanoscale Research Letters
|July 31, 2010
Summary
Researchers synthesized silver nanorings using a chemical reduction method. Reaction conditions like pH and reactant ratios influenced nanoparticle shape and surface plasmon resonance properties.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Colloidal silver nanoparticles exhibit unique optical properties due to surface plasmon resonance.
- Controlling nanoparticle morphology is crucial for tailoring their optical and physical characteristics.
Purpose of the Study:
- To synthesize silver nanorings using a facile chemical reduction method.
- To investigate the influence of synthesis parameters on the formation and optical properties of silver nanorings.
- To elucidate the reaction pathway for silver nanoring formation.
Main Methods:
- Synthesis of silver nanorings via reduction of silver ions (AgNO3) using sodium borohydride (NaBH4) in trisodium citrate buffer.
- pH adjustment with NaOH to accelerate the reduction reaction.
- Characterization using UV-vis spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD).
Main Results:
- UV-vis spectra revealed two surface plasmon resonance peaks for silver nanorings at approximately 400 nm (transverse) and 600-700 nm (longitudinal).
- Nanoparticle shape was found to be dependent on the AgNO3/NaBH4 ratio, pH, and reaction temperature.
- Analysis confirmed the formation of nanoring structures.
Conclusions:
- A method for synthesizing silver nanorings with tunable optical properties was established.
- The study provides insights into the factors controlling silver nanoring formation.
- A proposed reaction pathway aids in understanding the synthesis mechanism.
