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Phase Transfer of Triangular Silver Nanoprisms from Aqueous to Organic Solvent by an Amide Coupling Reaction
journal contribution
posted on 2013-06-11, 00:00 authored by Lijia Liu, Timothy L. KellyIn this paper, we describe a procedure
for the phase transfer of
silver nanoprisms (AgNPrs) from aqueous solution to chloroform via
an amide coupling reaction. AgNPrs are first modified with 16-mercaptohexadecanoic
acid (MHA), and then primary or secondary amines are attached to the
carboxylic acid end of the MHA ligand through a carbodiimide-mediated
amide coupling step. Secondary amines, such as dicyclohexylamine and
diphenylamine, are found to solubilize the nanoparticles in chloroform,
whereas primary amines (e.g., butylamine and hexadecylamine) do not
result in phase transfer. It is found that the AgNPrs functionalized
with dicyclohexylamine show the highest stability and the least aggregation
after undergoing phase transfer; in contrast, with a less nucleophilic
amine, such as diphenylamine, the amide coupling reaction does not
go to completion and the resultant AgNPrs are less stable and more
prone to aggregation.