Colloidal synthesis of metallodielectric Janus matchsticks

We present a gram-scale synthesis of metallodielectric Janus matchsticks, which feature a gold-coated silica sphere and a silica rod. SiO 2 Janus matchsticks are synthesized in one batch by growing amine-functionalized SiO 2 spheres at the end of SiO 2 rods. Gold deposition on the spheres produces Au-SiO 2 Janus matchsticks with an aspect ratio controlled by the rod length. The metallodielectric Janus matchsticks, produced by scalable colloidal synthesis, hold great potential as functional colloidal materials. Metallodielectric Janus matchsticks with variable aspect ratios are synthesized through a scalable approach that uses silica growth and functionalization at one end of microrods, followed by site-specific gold deposition.