Département de chimie moléculaire

Triangular AuAg nanoboxes functionalized with short DNA mols. (oligodeoxynucleotides, ODNs) were prepd. and their properties compared to those formed from spherical Au particles. The nanoboxes, produced from triangular Ag nanoplates (TSNPs) by redn. of AuCl4- with ascorbic acid, were further characterized by EDS mapping and HAADF-STEM measurements. Both AuAg nanoboxes and Au spherical nanoparticles were functionalized with thiol-terminated single-stranded ODNs or their complementary ODN sequences. When the complementary AuAg nanobox-ODN conjugates were combined they form networks, with the localized surface plasmon resonance (LSPR) band undergoing a red shift and a significant dampening. This assembly process was reversible upon heating and the systems showed sharp melting transitions, which could be monitored at wavelengths throughout the visible and near-IR. Finally, assemblies of the triangular nanoboxes and spherical nanoparticles were generated. [on SciFinder(R)]