Hybrid nanoparticles which contain two or more domains each having a unique feature can possess properties more than the sum of their individual parts.For this reason, they have gained great interests in catalysis, optoelectronics, imaging and therapeutic applications.Here, we describe synthetic methods that we have developed recently on producing hybrid nanoparticles with controlled geometries by tuning the interfacial energies, and explore the effect of surface and interface on the nanoparticle properties.