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

Yihuang Chen, Zewei Wang, Yeu Wei Harn, Shuang Pan, Zili Li, Shaoliang Lin, Juan Peng, Guangzhao Zhang, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

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.

Original languageEnglish
Pages (from-to)11910-11917
Number of pages8
JournalAngewandte Chemie - International Edition
Volume58
Issue number34
DOIs
StatePublished - 19 Aug 2019

Bibliographical note

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

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

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