The Abstracts Book of the 12th International Conference on Next Generation Materials Science and Nanotechnology (MSNG2025), a scientific platform that introduces the latest results of internationally recognized experts to local students and colleagues and also announces Türkiye's relevant achievements to the world, includes summaries of studies presented at the congress on energy applications, advanced materials, electronic and optoelectronic devices, new advanced and functional materials, advanced functional composites, biomaterials, smart materials, dielectric materials, optical materials, magnetic materials, organic semiconductors, inorganic semiconductors, electronic materials, and graphene