Abstract
Droplets comprises of gold nanoparticles (rod and dog-bone shapes) in suspension have been dried on SiO2 surface and drying process is captured by means of two cameras mounted on top and side of the deposition platform. Entire evaporation process is evaluated to quantify the drying behaviour carried out inside a close glass enclosure. High resolution scanning electron microscopy (HRSEM) within a deposited coffee-stain ring revealed that gold nanorods developed into multifaceted superstructures in the form of various domains. We believe that each individual nanorod domain is constructed in suspension and then bring together hydrodynamically with the nearby domain on the SiO2 surface. Further using similar setup, self-assembly of dog-bone shape nanoparticles near the outer edge of the coffee-stain ring is discussed. For both anisotropic nanostructures, growth mechanism of self-assemble superstructures are discussed.