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

Research paper by Zhiyue Zhang, Dr. Samarendra Maji, Dr. André B. da Fonseca Antunes, Riet De Rycke, Prof. Richard Hoogenboom, Prof. Bruno G. De Geest

Indexed on: 05 May '16Published on: 03 May '16Published in: Angewandte Chemie International Edition



Abstract

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.