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Angew Chem Int Ed Engl. 2019 Jun 13. doi: 10.1002/anie.201906329. [Epub ahead of print]

Resolving Optical and Catalytic Activities in Thermoresponsive Nanoparticles by Permanent Ligation with Temperature-Sensitive Polymers.

Author information

1
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
2
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200438, China.
3
School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China.
4
Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China.

Abstract

Thermoresponsive nanoparticles (NPs) represent an important hybrid material comprising functional NPs with temperature-sensitive polymer ligands. Strikingly, significant discrepancies in optical and catalytic properties of thermoresponsive noble-metal NPs have been reported, and have yet to be unraveled. Reported herein is the crafting of Au NPs, intimately and permanently ligated by thermoresponsive poly(N-isopropylacrylamide) (PNIPAM), in situ using a starlike block copolymer nanoreactor as model system to resolve the paradox noted above. As temperature rises, plasmonic absorption of PNIPAM-capped Au NPs red-shifts with increased intensity in the absence of free linear PNIPAM, whereas a greater red-shift with decreased intensity occurs in the presence of deliberately introduced linear PNIPAM. Remarkably, the absence or addition of free linear PNIPAM also accounts for non-monotonic or switchable on/off catalytic performance, respectively, of PNIPAM-capped Au NPs.

KEYWORDS:

block copolymers; catalytic activity; nanoparticles; nanoreactors; optical properties

PMID:
31197938
DOI:
10.1002/anie.201906329

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