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Published on: May 9, 2014
Free-standing plasmonic-nanorod superlattice sheets
Khee Chaw Ng1, Indika B Udagedara, Ivan D Rukhlenko
1Department of Chemical Engineering, Faculty of Engineering, Monash University, Clayton 3800, Victoria, Australia.
ACS Nano
|December 20, 2011
Summary
Researchers created free-standing gold nanorod superlattice sheets using polymer ligands. This breakthrough enables new plasmonic nanosheets for advanced nanophotonic devices and sensors.
Area of Science:
- Materials Science
- Nanotechnology
- Plasmonics
Background:
- Self-assembly of nanoparticles into superlattices offers tunable material properties.
- Progress in superlattices is limited for anisotropic building blocks, especially free-standing 2D arrays.
- Gold nanorods are promising anisotropic plasmonic nanomaterials.
Purpose of the Study:
- To report the controlled growth of free-standing, large-area, monolayered gold-nanorod superlattice sheets.
- To characterize the plasmonic properties of these novel superlattice sheets.
- To provide a scalable method for creating anisotropic plasmonic materials.
Main Methods:
- Entropy-driven interfacial self-assembly utilizing polymer ligands.
- Fabrication of free-standing, large-area, monolayered gold-nanorod superlattice sheets.
- Experimental characterization of plasmonic properties and theoretical modeling using discrete-dipole approximation.
Main Results:
- Successful controlled growth of gold-nanorod superlattice sheets.
- Demonstrated distinct plasmonic properties for horizontally aligned (H-sheets) and vertically aligned (V-sheets) assemblies.
- Validated experimental plasmonic features with a discrete-dipole approximation model.
Conclusions:
- A robust polymer-ligand strategy enables the fabrication of free-standing anisotropic superlattices.
- The developed method offers an inexpensive route to plasmonic nanosheets.
- This approach is extendable to other anisotropic plasmonic building blocks for nanophotonic applications.
