Submitted to - 1 - Conjugated polymer shells on colloidal templates by seeded Suzuki-Miyaura dispersion polymerisation Jan Bart ten Hove 1 , Jeroen Appel 1 , Johanna M. van den Broek 1 , Alexander J.C. Kuehne 2 & Joris Sprakel *1 [*] Corresponding author, email: joris.sprakel@wur.nl 1: Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB, Wageningen, the Netherlands. 2: Interactive Materials Research – DWI at RWTH Aachen University, Forckenbeckstraße 50, 52074 Aachen, Germany. Keywords: conjugated polymers; core-shell particles; colloids; suzuki-miyaura; seeded dispersion polymerisation. The self-assembly of colloidal conjugated polymers presents a versatile and powerful route towards new functional optoelectronic materials and devices. However, this strategy relies on the existence of chemical protocols to prepare highly monodisperse colloids of conjugated polymers in high yields. Here we adopt a recently developed Suzuki-Miyaura dispersion polymerization to the synthesis of core-shell particles, in which a conjugated polymer shell is grown onto non-conjugated organic and inorganic colloidal templates. By chemically anchoring aryl halide groups at the particle surface, a conjugated polymer shell can be attached to a wide variety of organic and inorganic microparticles. In this way, we prepared both spherical and non-spherical hybrid conjugated polymer particles, and show that the method can be applied to a variety of conjugated polymers. This new method offers independent control of the size, shape and photophysical properties of these novel conjugated polymer particles.