From aqueous to organic: A step-by-step strategy for shape evolution of gold nanoparticles

Uniform-sized gold nanoparticles were synthesized by a facile method, which is comprised of three steps: the first step to prepare Au colloid in aqueous, the second to transfer the particles into organic solvent and the third to reflux organic solution. The 2D/3D superlattices of as-prepared gold nanoparticles were fabricated by evaporating solvent from colloid solution at optimal concentration.