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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Nanocomposites IV: Nanoscience for Renewable Energy
Presentation Title Conditions for Effective Nanocrystal Shape Control in Colloidal SILAR Reactions
Author(s) Andrew B. Greytak
On-Site Speaker (Planned) Andrew B. Greytak
Abstract Scope Colloidal selective ionic layer adhesion and reaction (colloidal SILAR) is designed to control surface growth in colloidal nanocrystals using a series of self-limiting surface reactions that each supply one of the complementary ions. Though the method was initially described over a decade ago, only recently have the mechanistic assumptions in colloidal SILAR been directly tested. In particular, shape control via SILAR can only be achieved if the complementary precursors are efficiently converted to surface-bound forms in each half-cycle. Our group has investigated colloidal SILAR in the CdSe/CdS core/shell quantum dot system. ICP-MS measurements show that the choice of solvent can strongly influence precursor conversion. Commonly used primary amine solvents suppress Cd oleate conversion. We find that a tertiary amine solvent is effective in increasing precursor conversion and suppressing nucleation of side products. Under optimized conditions, good control of size and shape can be achieved with saturating precursor doses.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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Conditions for Effective Nanocrystal Shape Control in Colloidal SILAR Reactions
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