Authors: Y. Zheng
Affilation: Monash University, Australia
Pages: 192 - 195
Keywords: gold nanoparticle, size-selective separation, self-assembly, hcp ordering
A simple and versatile nanoscale force induced precipitation approach for the separation of gold nanoparticles (AuNPs) was developed. The AuNPs show sharp size-dependent colloidal stability thresholds as a function of salt concentration. Upon separation, the AuNPs were electrostatically self-assembled onto silicon substrates by fine-tuning interparticle and particle-substrate forces, forming 2D AuNP networks with a high degree of hexagonal closest pack (hcp) superstructures.