Noble Material Bowl-like Pore Array Coupled Nanoparticles Induced Localized Field Enhancement Effect

Surface enhanced Raman scattering(SERS)effect is a kind of fingerprint identification,high sensitivity,fast response detection,its wide range of applications in surface science,and analytical science.However,the coupling of the metal bowl-like structure between nanoparticles is still limited,especially the research in different medium.Therefore,we propose a study based on noble metal bowl-like pore array induced nanoparticles secondary enhanced coupling SERS effect and its theoretical calculation of FDTD.the following are the main innovative results:(1)In water,we put forward that based on the Au bowl-like pore array substrate,testing three kinds of the Raman spectrum without gold nanoparticles,with gold nanoparticles,or silver nanoparticles.We find that the bowl hole array substrate with Ag nanoparticles coupled to produce the strongest electric field,and induced the highest SERS effect;(2)We used FDTD method to build the individual Au nanoparticles in the water or two Au nanoparticles to continuously towards the bottom of the bowl hole,to study the changes of the electric field distribution.We found the strongest electric field is that the gap between Au nanoparticles and the bottom of the bowl is 75 nm;A single Au nanoparticles or Au nanoparticles on the wall of the bowl in different medium,the electric field distribution is different;(3)Au sol in drying process,the Au nanoparticles accumulating in the Ag bowl like pore,the Raman peak intensity was measured to be wave volatility.