The development of next generation green nano-devices with greatly reduced power dissipation and multifunctional properties is one of the greatest challenges in current nanoscience. This creates an enormous demand for functional nanostructures and novel nano-materials. In this research field, we explore new synthesis routes to fabricate nanomaterials and -structures with tailored structure-property relations. Bottom-up nanotechnology and self-assembly play an important role in the synthesis and growth of such nanomaterials. Their intricate optical, electronic and mechanical (quantum) properties are investigated and understood from a fundamental point of view.