Self-Assembly of Gold Nanoparticles at the Oil–Vapor Interface: From Mono- to Multilayers
journal contributionposted on 11.11.2014, 00:00 by Philip Born, Volker Schön, Susanne Blum, Dominik Gerstner, Patrick Huber, Tobias Kraus
Alkylthiol-coated gold nanoparticles spontaneously segregate from dispersion in toluene to the toluene–vapor interface. We show that surface tension drops during segregation with a rate that depends on particle concentration. Mono- and multilayers of particles form depending on particle concentration, time, and temperature. X-ray reflectometry indicates fast monolayer formation and slow multilayer formation. A model that combines diffusion-limited segregation driven by surface energy and heterogeneous agglomeration driven by dispersive van der Waals particle interactions is proposed to describe film formation.