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Nanoreactors for Studying Single Nanoparticle Coarsening

By Jinan Chai (2116009), Xing Liao (1921759), Louise R. Giam (2128135) and Chad A. Mirkin (16519)

Abstract

The ability to observe intermediate structures as part of coarsening processes that lead to the formation of single nanoparticles (NPs) is important in gaining fundamental insight pertaining to nanostructure growth. Here, we use scanning probe block copolymer lithography (SPBCL) to create “nanoreactors” having attoliter volumes, which confine Au NP nucleation and growth to features having diameters <150 nm on a substrate. With this technique, one can use in situ TEM to directly observe and study NP coarsening and differentiate Ostwald ripening from coalescence processes. Importantly, the number of metal atoms that can engage in coarsening can be controlled with this technique, and TEM “snapshots” of particle growth can be taken. The size of the resulting nanostructures can be controlled in the 2–10 nm regime

Topics: Biophysics, Molecular Biology, Biotechnology, Developmental Biology, Virology, Space Science, Environmental Sciences not elsewhere classified, Physical Sciences not elsewhere classified, nm, study NP coarsening, technique, NP nucleation, SPBCL, coalescence processes, coarsening processes, TEM, use scanning probe block copolymer lithography, particle growth, nanostructure growth, Single Nanoparticle CoarseningThe ability, attoliter volumes, metal atoms
Year: 2012
DOI identifier: 10.1021/ja2097964.s003
OAI identifier: oai:figshare.com:article/2562829
Provided by: FigShare
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