ANISOMETRIC GOLD NANOPARTICLE SELF-ASSEMBLY AT WATER/AIR INTERFACE

We present gold nanorods (AuNRs) self-assembly at liquid/gas interface. Gold nanoparticles of various shapes (spheres, rods, cubes) forms 2D packed arrays at water/air interface during controlled drying from aqueous colloidal solution. The formed AuNR arrays are deposited on optically transparent substrate and identified by white-light transmission optical microscopy and scanning electron microscopy. The two methods are used to correlate the differing rod orientation/assembly to the far-field optical response of formed 2D arrays. AuNRs are synthesized by modification of seeded growth method and used in the form of colloidal solution with cetyltrimethylammonium bromide (CTAB) as stabilizing surfactant. We utilize selfassembly of AuNRs in aqueous environment using simple system of AuNR/CTAB/water.