Large scale synthesis of Janus submicron sized colloids by wet etching anisotropic ones.

Janus colloids have inspired growing interests due to their diverse potential applications. Herein, we present a facile approach to fabricate Janus submicron sized colloids by the selective etching of anisotropic colloids. Size ratio, microstructure and composition are tunable. The method can be scaled up, which is the key to further exploit practical applications.