No abstract

Monodisperse AuAg alloy NPs were synthesized by a one-pot approach with composition control. Oleylamine was used as the surfactant and was readily removed. The AuAg alloy NPs show the compositional dependent plasmonic absorptions and catalytic CO oxidation, indicating their great potentials as optical probes for bioimaging and as active catalyst for chemical reactions.

Monodisperse AuAg alloy nanoparticles (NPs) are made from core/shell Ag/Au NPs through Au and Ag diffusion in oleylamine. The composition of the alloy NPs is controlled by the Au shell thickness and the plasmonic absorptions can be tuned from 520 to 400 nm (see image). These alloy NPs have great potential as optical probes for biosensing and bioimaging, or as catalysts for CO oxidation.