Fabricating Blackberry-like Ag/Au Nanostructure Arrays On Functional Substrate And Their SERS Property Researches

The highly ordered nanostructure arrays have become a research hotspot in recent years due to its periodic structure.Preparation nanostructure arrays on different substrates have a widely applications in surface enhanced Raman scattering(SERS),surface enhanced fluorescence,biological sensors,magnetic energy storage materials,solar cells,etc.At present,the highly ordered nanostructure arrays was preparation on funcitonal substrate in three steps.The first step is prepare ultrathin anodic alumina template(UTAM)by secondary anodizing.In the second step,the ultrathin anodized aluminum oxide template was transplanted to the substrate by using PMMA as a supporting layer.The third step,assembled the nanostructure array on the substrate,using the ultrathin alumina template as mask.However,it is difficult to control the gap,between two nearby nanostructures,under 20 nm by using the nanostructure array which was prepared by the three-step method.Meanwhile,organic impurities are introduced in the process of transferring.To solve these technology problems,a support layer free transplant method was reported in this paper.And comparative study the different between PMMA as support layer for transplantation(UTAM?)and without supporting layer for transplantation(UTAM?).In our study,no organic impurities were introduced in UTAM.Then,prepare blackberry-like gold/silver nanostructure arrays using magnetron sputtering based on UTAM? and UTAM? transplantation methods.The prepared nanostructure arrays' gaps is around 10 nm.Explores the preparation technology,and illustrates the mechanism of its formation.Finally,Raman spectroscopy is used for characterization the SERS performance of prepared blackberry-like silver/gold nanostructure arrays.And it was proved that prepared blackberry-like nanostructure arrays can be used as a good SERS substrate.And the finite difference time domain(FDTD)method is used to study the localized electromagnetic field distribution of blackberry-like gold nanostructure arrays.