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Optical Nanoparticle Sorting Elucidates Synthesis of Plasmonic Nanotriangles
María Ana Huergo1,2,3, Christoph Matthias Maier2,3, Marcos Federico Castez1
1Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET , Sucursal 4 Casilla de Correo 16, 1900 La Plata, Argentina.
ACS Nano
|February 25, 2016
Summary
Researchers precisely printed gold nanotriangles using optical forces, revealing their role in near-infrared light absorption and potential for sensing applications.
Area of Science:
- Nanotechnology
- Materials Science
- Optical Physics
Background:
- Gold nanoparticles exhibit unique optical properties due to surface plasmon resonances.
- Controlling nanoparticle synthesis and placement is crucial for advanced applications.
Purpose of the Study:
- To investigate the relationship between the morphology and optical properties of gold nanoparticles.
- To demonstrate selective nanoparticle printing for creating complex nanostructures.
Main Methods:
- Synthesis of gold nanoparticles using sodium sulfide reduction.
- Optical trapping and selective printing of individual nanoparticles onto a substrate.
- Combined dark-field spectroscopy and scanning electron microscopy for characterization.
Main Results:
- Identified thin gold nanotriangles as the source of near-infrared plasmon resonance.
- Correlated nanoparticle shape evolution (lateral growth, thickening, truncation) with plasmon resonance shifts.
- Characterized nanotriangles with narrow linewidths (187 ± 23 meV) and isotropic scattering.
Conclusions:
- Gold nanotriangles possess tunable plasmon resonances suitable for sensing and imaging.
- Selective nanoparticle printing enables the construction of complex nanostructures with tailored optical properties.
- The synthesis and printing method is versatile for various nanoparticle systems.
