Size-Dependent Phase Transfer Functionalization of Gold Nanoparticles To Promote Well-Ordered Self-Assembly

Florian Schulz; Steffen Tober; Holger Lange

doi:10.1021/acs.langmuir.7b03600

Size-Dependent Phase Transfer Functionalization of Gold Nanoparticles To Promote Well-Ordered Self-Assembly

Langmuir. 2017 Dec 19;33(50):14437-14444. doi: 10.1021/acs.langmuir.7b03600. Epub 2017 Dec 11.

Authors

Florian Schulz^{1

2}, Steffen Tober¹, Holger Lange^{1

2}

Affiliations

¹ Institute for Physical Chemistry, University of Hamburg , Grindelallee 117, 20146 Hamburg, Germany.
² The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany.

PMID: 29192781
DOI: 10.1021/acs.langmuir.7b03600

Abstract

We present a route for the functionalization of gold nanoparticles (AuNP) based on phase transfer functionalization in order to optimize the stability and the potential for self-assembly. Depending on the desired size, different ligand exchanges have to be employed: The maximum AuNP size that can be stabilized without concentration loss is 46 nm for polystyrene-based ligands with 5 and 10 kDa. Small particles <12 nm are better stabilized by smaller ligands. We are able to demonstrate that well-ordered close-packed monolayers of 28 nm AuNP covering at least 400 μm² are possible with a potential for much larger areas. Such monolayers are of great interest for various fundamental experiments in the context of plasmonics and SERS and for sensor applications.

Publication types

Research Support, Non-U.S. Gov't