Site-specific functionalization of anisotropic nanoparticles: From colloidal atoms to colloidal molecules

Fan Li, Won Cheol Yoo, Molly B. Beernink, Andreas Stein

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Multipodal nanoparticles (NPs) with controlled tethers are promising principal building blocks, useful for constructing more complex materials, much like atoms are connected into more complex molecules. Here we report colloidal sphere templating as a viable means to create tetrapodal NPs with site-specific tethers. Amorphous sol-gel materials were molded by the template into shaped NPs that mimic tetravalent atoms but on the length scale of colloids. Synthetic methods were developed to modify only the tips of the tetrapods with a range of possible functional groups to generate anisotropic NPs capable of directional bonding to other NPs. We also illustrate that sets of tethered "colloidal atoms" can assemble themselves into "colloidal molecules" with precise placement of the modifying colloids. The templating and tethering approaches to these anisotropic colloidal building blocks and the assembly methods are applicable to many compositions regardless of crystal structure, therefore lending themselves to the fabrication of complex assemblies, analogous to those found in the molecular regime.

Original languageEnglish (US)
Pages (from-to)18548-18555
Number of pages8
JournalJournal of the American Chemical Society
Volume131
Issue number51
DOIs
StatePublished - Dec 30 2009

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