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 2016-06, Vol.128 (25), p.7202-7206
Main Authors: Zhang, Zhiyue, Maji, Samarendra, da Fonseca Antunes, André B., De Rycke, Riet, Hoogenboom, Richard, De Geest, Bruno G.
Format: Article
Language:eng ; ger
Subjects:
Chemistry
Citrates
Citric acid
Coating
Deposition
Dünne Filme
Gold
Goldnanopartikel
Hydrophobicity
Metals
Nanoparticles
Oberflächenchemie
Polymer coatings
Polymere
Polymers
Reduction (metal working)
Salts
Screening
Selbstorganisation
Sodium
Sodium chloride
Solid surfaces
Substrates
Temperature effects
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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. Hydrophobe Verbindung: Durch Citrat‐Reduktion erzeugte und mit thermoresponsiven Polymeren (z. B. polyNIPAm) beschichtete Au‐ und Ag‐Nanopartikel bilden eine monoschichtartige Struktur auf verschiedenen Trägermaterialien in Gegenwart von NaCl. Das Phänomen wird in salzfreien Medien nicht beobachtet und kann der hydrophoben Wechselwirkung zwischen Nanopartikeln und Träger zugeschrieben werden.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201601037