State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, P. R. China
Abstract:
An Ag-coated polyimide (PI) nanorod array was prepared by sputtering Ag film on a PI nanorod array fabricated using oxygen plasma etching. The method is a facile way to fabricate a surface-enhanced Raman scattering (SERS) substrate with high sensitivity and a tunable structure. The diameter and density of the Agcoated nanorods and the gap between them could be tuned by changing the oxygen plasma etching time and Ag film thickness. Nile Blue (NB) was used as a probe molecule to investigate the SERS enhancement of this Ag nanostructure. The SERS peak intensity varied with the plasma etching time and Ag film thickness. The largest sensitivity was obtained with 30 s of oxygen plasma etching and 70 nm of sputtering Ag film. The SERS substrate also exhibited excellent signal reproducibility.
