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Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method
Published on: January 15, 2012
Microbial synthesis of multishaped gold nanostructures
Sujoy K Das1, Akhil R Das, Arun K Guha
1Department of Biological Chemistry, Indian Association for the Cultivation of Science, Kolkata, India.
Small (Weinheim an Der Bergstrasse, Germany)
|April 9, 2010
Summary
Researchers developed a green synthesis method for diverse gold nanoparticles using fungal extract. This approach offers controlled nanoparticle shapes for nanotechnology applications.
Area of Science:
- Nanotechnology
- Materials Science
- Biotechnology
Background:
- Controlled synthesis of nanoparticles with specific sizes and shapes is crucial in nanotechnology.
- Existing methods often involve complex procedures or harsh chemicals.
Purpose of the Study:
- To develop a simple, green chemical method for synthesizing multishaped gold nanoparticles.
- To utilize cell-free fungal extract as a multifunctional agent in nanoparticle synthesis.
Main Methods:
- Green synthesis using chloroauric acid and cell-free extract of Rhizopus oryzae at room temperature.
- Manipulation of growth parameters (gold ion concentration, pH, reaction time) to control nanoparticle shape.
- Characterization using UV/Vis spectroscopy, FTIR, TEM, and EDX analysis.
Main Results:
- Successfully synthesized various gold nanocrystal shapes including triangular, hexagonal, pentagonal, spherical, spheroidal, urchinlike, 2D nanowires, and nanorods.
- Cell-free extract acted as a reducing, shape-directing, and stabilizing agent.
- Electron diffraction confirmed the crystalline nature of the synthesized nanoparticles.
Conclusions:
- The fungal cell-free extract provides a versatile platform for green synthesis of diverse gold nanostructures.
- This method offers a controllable and environmentally friendly approach to nanoparticle fabrication.
- A probable formation mechanism for the different structural entities was proposed.
