The formation process of the AgBr Ag porous microspheres was

Since, the generated AgBr copied the CuBr template, the diameter of these AgBr/Ag composite microspheres remains unchanged. (c) During the ion-exchange process, lots of Cu+ ions were released from CuBr template and would reduce the Ag+ ions nearby into Ag nanoparticles, which deposited onto the surface of AgBr skeleton. Since the reaction between Ag+ and Cu+ ions took place later, the Ag content in the final product could be controlled by simple adjusting the amount of Ag+ ions.