▎ 摘　　要

In this work, we reported the spontaneous growth of Ag and Au microstructures on the surface of the graphene oxide-grafted-polystyrene sulfonic acid brushes (GO-g-PSSA) in Ag(NH3)(2)OH solution and HAuCl4 solution, respectively. The influences of reaction time and temperature on the morphology and size of Ag (Au) particles were investigated. By optimizing reaction conditions, Ag nanosheet-assembled microstructures and sea urchin-like Au microspheres were obtained. These hierarchical Ag (Au) microstructures with highly nanotextured topographies could provide many "hot spots" for surface-enhanced Raman spectroscopy (SERS). The as-prepared GO-g-PSSA/Ag (Au) composites exhibited excellent SERS performances using Rhodamine 6G (R6G) as the probe molecules and the detection limit of R6G was up to 10(-12) m.