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Exploiting Crystallographic Regioselectivity To Engineer Asymmetric Three-Component Colloidal Nanoparticle Isomers Using Partial Cation Exchange Reactions
journal contribution
posted on 2018-05-22, 00:00 authored by Julie
L. Fenton, Benjamin C. Steimle, Raymond E. SchaakThe precise placement
of different materials in specific regions
of a nanocrystal is important for many applications, but this remains
difficult to achieve synthetically. Here we show that regioselectivity
during partial cation exchange reactions of metal chalcogenide nanocrystals
emerges from crystallographic relationships between the precursor
and product phases. By maximizing the formation of low-strain interfaces,
it is possible to rationally integrate three distinct materials within
uniform spherical and rod-shaped colloidal nanoparticles to produce
complex asymmetric heterostructured isomers. Through sequential partial
exchange of Cu+ in Cu1.8S nanocrystals with
Zn2+ and Cd2+, five distinct ZnS/CdS/Cu1.8S nanosphere and nanorod isomers are accessible.