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Salt‐Driven Deposition of Thermoresponsive Polymer‐Coated Metal Nanoparticles on Solid Substrates
Author(s) -
Zhang Zhiyue,
Maji Samarendra,
da Fonseca Antunes André B.,
De Rycke Riet,
Hoogenboom Richard,
De Geest Bruno G.
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201601037
Subject(s) - nanoparticle , polymer , monolayer , aqueous solution , chemical engineering , salt (chemistry) , materials science , coating , noble metal , chemistry , metal , nanotechnology , organic chemistry , engineering
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.