Fig. 8: Morphology of the silver nanoring array.

a The SEM micrograph of silver nanoring arrays with the magnification of ×16,000, ×50,000, and ×700,000, respectively. b The 3D AFM image shows a clear silver nanoring array

a The SEM micrograph of silver nanoring arrays with the magnification of ×16,000, ×50,000, and ×700,000, respectively. b The 3D AFM image shows a clear silver nanoring array