Journal
SMALL
Volume 5, Issue 24, Pages 2828-2834Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200901453
Keywords
anisotropic materials; droplets; gold; microfluidics; nanoparticles
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Funding
- NUS FRC [R-279-000-220-112/133]
- Singopore-MIT Alliance
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A droplet-based microfluidic method for the preparation of anisotropic gold nanocrystal dispersions is presented. Gold nanoparticle seeds and growth reagents are dispensed into monodisperse picoliter droplets within a microchannel. Confinement within small droplets prevents contact between the growing nanocrystals and the microchannel walls. The critical factors in translating macroscale flask-based methods to a flow-based microfluidic method arc, highlighted and approaches are demonstrated to flexibly fine time nanoparticle shapes into three broad classes: spheres/spheroids, rods, and extended sharp-edged structures, thus varying the optical resonances in the visible-near-infrared (NIR) spectral range.
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