Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 25, Pages 7086-7090Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201601037
Keywords
gold nanoparticles; polymers; self-assembly; surface chemistry; thin films
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Funding
- Chinese Scholarship council (CSC)
- FWO Flanders
- Ghent University (BOF)
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Here we report on a simple, generally applicable method for depositing metal nanoparticles on a wide variety of solid surfaces under all aqueous conditions. Noble-metal nanoparticles obtained by citrate reduction followed by coating with thermoresponsive polymers spontaneously form a monolayer-like structure on a wide variety of substrates in presence of sodium chloride whereas this phenomenon does not occur in salt-free medium. Interestingly, this phenomenon occurs below the cloud point temperature of the polymers and we hypothesize that salt ion-induced screening of electrostatic charges on the nanoparticle surface entropically favors hydrophobic association between the polymer-coated nanoparticles and a hydrophobic substrate.
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