Journal
ACS NANO
Volume 10, Issue 3, Pages 3614-3621Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b08095
Keywords
optical printing; gold nanoparticles; cancer therapy; nanoshells; plasmon; nanoparticle sorting
Categories
Funding
- ERC
- ANPCyT [PICT 2010-2554, 2012-0836]
- CONICET [PIP 112-200801-00362, 112-201201-00093]
- DAAD
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We investigate the optical and morphological properties of gold nanoparticles grown by reducing a gold salt with Na2S. Lasers are tuned to the observed plasmon resonances, and the optical forces exerted on the nano particles are used to selectively print individual nano particles onto a substrate. This enables us to combine dark field spectroscopy and scanning electron microscopy to compare the optical properties of single nanoparticles with their morphology. By arresting the synthesis at different times, we are able to investigate which type of nanoparticle is responsible for the respective resonances. We find that thin Au nanotriangles are the source of the observed near infrared (NIR) resonance. The initial lateral growth of these triangles causes the plasmon resonance to redshift into the NIR, whereas a subsequent thickening of the triangles and a concomitant truncation lead to a blueshift of the resonance. Furthermore, we find that the nanotriangles produced have extremely narrow line widths (187 +/- 23 meV), show nearly isotropic scattering, and are stable for long periods of time. This shows their vast potential for applications such as in vivo imaging and bio(chemical) sensing. The method used here is generally applicable to other syntheses, and shows how complex nanostructures can be built up on substrates by selectively printing NPs of varying plasmonic resonances.
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