Salt-Driven Deposition of Thermoresponsive Polymer-Coated Metal Nanoparticles on Solid Substrates

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...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2016-06, Vol.55 (25), p.7086-7090
Main Authors: Zhang, Zhiyue, Maji, Samarendra, da Fonseca Antunes, André B., De Rycke, Riet, Hoogenboom, Richard, De Geest, Bruno G.
Format: Article
Language:English
Subjects:
Citric acid
Coating
Deposition
Gold
gold nanoparticles
Hydrophobicity
Metals
Nanoparticles
Polymer coatings
Polymers
Reduction (metal working)
Salts
Screening
self-assembly
Sodium
Sodium chloride
Solid surfaces
Substrates
surface chemistry
Temperature effects
thin films
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Summary: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. Hydrophopic association: Gold and silver nanoparticles obtained by citrate reduction followed by coating with temperature‐responsive polymers (e.g. polyNIPAm) spontaneously form a monolayer‐like structure on a wide variety of substrates in the presence of sodium chloride. This phenomenon did not occur in salt‐free medium. This behavior is mainly attributed to hydrophobic interaction between the metal nanoparticles and the substrate.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201601037