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Nanoporous Gold Nanocomposites as a Versatile Platform for Plasmonic Engineering and Sensing
Fusheng Zhao1, Jianbo Zeng2, Wei-Chuan Shih3,4,5,6,7
1Department of Electrical and Computer Engineering, University of Houston, 4800 Calhoun Rd, Houston, TX 77004, USA. fzhao3@uh.edu.
Sensors (Basel, Switzerland)
|June 29, 2017
Summary
Researchers explored interactions between gold nanoparticles and nanoporous gold disks. This created hybrid nanocomposites with tunable plasmonic properties and identified new hot-spots for sensing applications.
Area of Science:
- Nanotechnology
- Materials Science
- Plasmonics
Background:
- Plasmonic metal nanostructures are promising for sensing.
- Monolithic nanoporous gold disks (NPGD) offer unique 3D porous networks, large surface areas, tunable plasmonic resonance, and high-density hot-spots.
- NPGDs are stable and suitable for surface-enhanced spectroscopy, photothermal conversion, and plasmonic sensing.
Purpose of the Study:
- To investigate the interactions between smaller colloidal gold nanoparticles (AuNP) and individual NPGDs.
- To create NPG hybrid nanocomposites with tunable plasmonic resonance peaks.
- To identify and characterize newly formed plasmonic hot-spots.
Main Methods:
- Loading colloidal gold nanoparticles of varying sizes onto NPGD substrates.
- Experimental characterization using extinction and surface-enhanced Raman scattering (SERS).
- Numerical modeling and simulations to understand coupling mechanisms.
Main Results:
- Formation of NPG hybrid nanocomposites with tunable plasmonic resonance in the near-infrared range.
- Identification of new plasmonic hot-spots resulting from AuNP-NPGD coupling.
- Experimental validation of hot-spot formation and coupling phenomena.
Conclusions:
- The study successfully demonstrates the creation of NPG hybrid nanocomposites with tailored plasmonic properties.
- The findings highlight the potential of these nanocomposites for advanced sensing applications.
- Understanding AuNP-NPGD coupling is crucial for optimizing plasmonic performance.
