Janus Plasmonic Silver Nanoplatelets for Interface Stabilization

The preparation of Janus plasmonic metal nanoparticles has remained challenging because of their susceptibility to chemical etching and incompatibility with high-temperature processing. Instead of the conventional methods of using Pickering emulsion and vapor deposition, herein Janus silver nanoplatelets (J-AgNPs) with two chemically distinct surfaces are fabricated via a disparate electrostatic adsorption approach. The approach avoids corrosive chemicals and elevated temperatures that degrade the AgNPs. The J-AgNPs show great potential in stabilizing emulsions and forming layered nanostructures at the interfaces. This novel method enables the design of plasmonic nanomaterials at the liquid–liquid and solid–liquid interfaces for colloidal stabilization.