title: Physical deposition improved SERS stability of morphology controlled periodic micro/nanostructured arrays based on colloidal templates.
abstract: An effective and inexpensive method is developed to fabricate periodic arrays by sacrificial colloidal monolayer template route by chemical deposition and further physical deposition. By a colloidal template induced precursor solution dipping strategy, different periodic arrays of semi-hollow sphere array, inverse opal with monolayer pore arrays and hole arrays are obtained under different conditions. After magnetron sputtering deposition, their morphologies are changed to novel micro/nanostructured arrays of honeycomb-shaped arrays, hollow cavity arrays, and regular network arrays due to multiple direction deposition of sputtering deposition and shadow effect. After coating a gold thin layer, these periodic micro/nanostructured arrays are used as SERS active substrates and demonstrate a very stable SERS performance compared with periodic arrays achieved by direct colloidal template-induced chemical deposition. Additionally, a honeycomb-shaped array displays better SERS enhancement than that of a hollow cavity array or a regular network array. After optimization of honeycomb-shaped arrays with different periodicities, an array with periodicity of 350 nm demonstrates much stronger SERS enhancement and possesses a low detection limit of 10(-11) M R6G. Such stable SERS performance is useful for practical application in portable Raman detecting devices to detect organic molecules.
authors.affiliation: Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, Anhui, China; Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
authors.forename: Honghua
authors.initials: H
authors.lastname: Zhang
authors.forename: Mao
authors.initials: M
authors.lastname: Liu
authors.forename: Fei
authors.initials: F
authors.lastname: Zhou
authors.forename: Dilong
authors.initials: D
authors.lastname: Liu
authors.forename: Guangqiang
authors.initials: G
authors.lastname: Liu
authors.forename: Guotao
authors.initials: G
authors.lastname: Duan
authors.forename: Weiping
authors.initials: W
authors.lastname: Cai
authors.forename: Yue
authors.initials: Y
authors.lastname: Li
mesh_terms: D003102:Colloids / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D060328:Magnetic Phenomena; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010507:Periodicity; D055585:Physical Phenomena; D013052:Spectrometry, X-Ray Emission; D013059:Spectrum Analysis, Raman; D014961:X-Ray Diffraction
chemical_list: D003102:Colloids; D006046:Gold
keywords: SERS; arrays; colloidal monolayers; sputtering deposition