This document discusses key materials and chemicals areas including 3D printing materials, biomaterials, micro/nano-electronics, organic and printed electronics, and polymer/macromolecule materials. It provides brief definitions and applications for bioelectronics, which studies electronic problems in biological systems and applies electronic theory to solve biological issues, as well as biomaterials, micro/nano-electronics, organic and printed electronics, and polymer/macromolecule materials. The document also lists manufacturing processes for micro/nano-electronics and organic and printed electronics and notes other materials and chemicals topics.