Preparation of SiO2@ Au nanorod array as novel surface enhanced Raman substrate for trace pollutants detection |
SEM morphology of SiO2@Au nanorods array. Depositing times of Au nanoparticles are (a) 30 s, (b) 60 s, (c) 90 s, (d) 120 s, (e) 150 s, and (f) 180 s, respectively. |