Journal
NANO LETTERS
Volume 10, Issue 9, Pages 3757-3763Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl102478q
Keywords
Foams; emulsions; microfluidics; nanoshells; gold; nanoparticles; plasmonics
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Funding
- National University of Singapore
- NUS [R-279-000-220-112/133]
- Chemical and Pharmaceutical Engineering Programme of the Singapore-MIT Alliance
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The availability of robust, scalable, and automated nanopariicle manufacturing processes is crucial for the viability of emerging nanotechnologies. Metallic nanoparticles of diverse shape and composition are commonly manufactured by solution phase colloidal chemistry methods, where rapid reaction kinetics and physical processes such as mixing are inextricably coupled, and scale-up often poses insurmountable problems. Here we present the First continuous low process to synthesize thin gold nanoshells and nanoislands on colloidal silica surfaces, which are nanoparticle motifs of considerable interest in plasmonics-based applications. We assemble an ordered, flowing composite foam lattice in a simple microfluidic device, where the lattice cells are alternately aqueous drops containing reagents for nanoparticle synthesis or gas bubbles. Microfluidic foam generation enables precisely controlled reagent dispensing and mixing, and the ordered foam structure facilitates compartmentalized nanoparticle growth. This is a general method for aqueous colloidal synthesis, enabling continuous, inherently digital, scalable, and automated production processes for plasmonic nanomaterials.
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