Polymer brushes are polymer that tenders one end on the surface.Because of its chemical diversity,mechanical robustness,and high grafting density,polymer brush shows great potentials in a wide variety of applications ranging from electronic fabrications to stem cell researches.This talk will focus on two important issues with polymer brushes.The first part will demonstrate how one can use polymer brushes as a nanoplatform for making high-performance flexible and stretchable metallic textiles.The second part will focus on the state-of-the-art development of a nanotechnology,namely "dip-pen nanodisplacement lithography (DNL)",for making 3D polymer structures.