Crystallization-Driven Two-Dimensional Self-Assembly
of Amphiphilic PCL‑b‑PEO Coated Gold
Nanoparticles in Aqueous Solution
Posted on 2018-08-15 - 19:48
This
Letter reports the first formation of free-standing plasmonic
monolayer nanosheets by the self-assembly of AuNPs without assistance
from a planar interface. The strategy involves the coating of poly(caprolactone)-b-poly(ethylene oxide) (PCL-b-PEO) diblock
copolymers on AuNPs, followed by two-dimensional (2D) self-assembly
of the resultant amphiphilic AuNPs in aqueous phase. The crystallization
of the PCL blocks, affected by their grafting density and radius of
gyration, drives the formation of the AuNP nanosheets, which undergoes
a growth process of individual micelles to small nanosheets and eventually
to large sheets. Due to the plasmonic coupling of AuNPs in close proximity,
the AuNP nanosheets exhibit near-infrared (NIR) absorption with the
maximum at about 700 nm. This study not only brings a new approach
toward polymer–AuNP hybrid superstructures in solution, but
also provides a new system for fundamental study on 2D self-assembly
of AuNPs.
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Xu, Fugui; Zhang, Pengfei; Zhang, Jiacheng; Yu, Chunyang; Yan, Deyue; Mai, Yiyong (2018). Crystallization-Driven Two-Dimensional Self-Assembly
of Amphiphilic PCL‑b‑PEO Coated Gold
Nanoparticles in Aqueous Solution. ACS Publications. Collection. https://doi.org/10.1021/acsmacrolett.8b00383
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AUTHORS (6)
FX
Fugui Xu
PZ
Pengfei Zhang
JZ
Jiacheng Zhang
CY
Chunyang Yu
DY
Deyue Yan
YM
Yiyong Mai