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Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography
Published on: September 2, 2017
Shape-controlled electrodeposition of gold nanostructures
Yang Tian1, Haiqing Liu, Guohua Zhao
1Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, People's Republic of China.
The Journal of Physical Chemistry. B
|November 17, 2006
Summary
Researchers developed a low-cost electrochemical method to create gold nanostructures like pyramids and rods. The nanopyramids showed unique optical properties but lower oxygen reduction activity due to their surface facets.
Area of Science:
- Nanotechnology
- Electrochemistry
- Materials Science
Background:
- Gold nanostructures exhibit unique optical and electronic properties.
- Controlling the shape and surface facets of nanostructures is crucial for their applications.
- Electrochemical methods offer tunable synthesis routes for nanomaterials.
Purpose of the Study:
- To develop a novel, cost-effective electrochemical method for synthesizing diverse gold nanostructures.
- To investigate the influence of deposition parameters on nanostructure morphology and crystallography.
- To evaluate the electrocatalytic activity of different gold nanostructures, focusing on oxygen reduction.
Main Methods:
- One-step, nontemplated electrochemical overpotential deposition (OPD) of gold.
- Manipulation of deposition potentials and HAuCl4 concentrations to control nanostructure shape.
- X-ray diffraction (XRD) for crystallographic analysis.
- Electrochemical techniques to assess oxygen reduction activity.
Main Results:
- Successfully fabricated gold nanopyramids, nanorods, and spheres on polycrystalline gold substrates.
- Nanopyramids were predominantly composed of (111) facets, exhibiting anisotropic structures.
- Nanopyramids displayed broad visible light extinction due to plasmon resonance.
- Gold electrodes with nanopyramids showed lower oxygen reduction activity compared to other shapes.
Conclusions:
- The electrochemical OPD method provides a versatile and low-cost route to synthesize various gold nanostructures.
- The crystallographic orientation, particularly the dominance of (111) facets in nanopyramids, influences their plasmonic and electrocatalytic properties.
- Understanding structure-property relationships is key for designing gold nanostructures for specific applications, like catalysis.
