Regensburg 2016 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 49: Nanomaterials II: Synthesis
MM 49.2: Talk
Thursday, March 10, 2016, 10:30–10:45, H39
Optical Nanoparticle Sorting Elucidates Synthesis of Plasmonic Nanotriangles — •Christoph Maier1, Maria A. Huergo2, Marcos F. Castez2, Carolina Vericat2, Roberto C. Salvarezza2, Alexander S. Urban1, and Jochen Feldmann1 — 1Chair for Photonics and Optoelectronics, Department of Physics, Ludwig-Maximilians-Universität, Amalienstaße 54, 80799 Munich, Germany — 2Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata, Sucursal 4 Casilla de Correo 16, 1900 La Plata, Argentina
The synthesis of plasmonic nanoparticles by reducing gold salt by sodium sulfide leads to the formation of a strong near infrared (NIR) extinction peak [1], signifying strong potential for hyperthermic cancer treatment. However, the nature of the underlying nanoparticles has been a matter of debate. Hybrid core-shell and gold nanoparticles with different shapes have been discussed. [2] We introduce wavelength selective optical printing in order to sort the synthesized nanoparticles according to their plasmon resonances. By arresting the synthesis at different times, we find that thin gold nanotriangles are responsible for the observed NIR resonance. We also discuss and explain the observed spectral shifts of the plasmon resonances as observed during synthesis. This novel method is applicable to other plasmonic nanoparticle syntheses. In the future, complex nanostructures can be built up on substrates by selectively printing nanoparticles of varying plasmonic resonances. [1] Zhou, H.S., et al., PRB 1994, 50, (16), 12052-12056 [2] Diao, J. J., et al., J. Chem. Phys 2006, 124, (11), 116103