ao9b04492_si_001.pdf (48.58 MB)
Facile Synthesis of Monodispersed Ag NPs in Ethylene Glycol Using Mixed Capping Agents
journal contribution
posted on 2020-03-12, 12:10 authored by Suyue Chen, Jacob R. Drehmel, R. Lee PennCapping agents play an important
role in the synthesis of silver
nanostructures in polyol solvents. In this work, we demonstrate that
using a small amount of tannic acid (TA), a reducing capping agent,
in addition to poly(vinylpyrrolidone) (PVP), a protective capping
agent, can lead to the production of monodisperse spherical silver
nanoparticles (Ag NPs) that are stable with respect to particle aggregation
for at least 100 days and have particle sizes ranging from 16 to 28
nm depending on the TA concentration. We hypothesize that the complexation
between PVP and TA can lead to the formation of a stable particle
coating and a fast Ag+ reduction rate at a relatively high
TA concentration. Both effects can benefit the formation of small
spherical Ag NPs with narrow size distribution.