Self-Assembled Plasmonic Pyramids from Anisotropic Nanoparticles for High-Efficient SERS

作     者：Wenjuan Yang Kae Jye Si Pengzhen Guo Dashen Dong Debabrata Sikdar Malin Premaratne Wenlong Cheng 

作者机构：Department of Chemical EngineeringFaculty of EngineeringMonash UniversityClaytonVIC 3800Australia The Melbourne Centre for Nanofabrication151 Wellington RoadClaytonVIC 3168Australia Advanced Computing and Simulation Laboratory(AvL)Department of Electrical and Computer Systems EngineeringFaculty of EngineeringMonash UniversityClaytonVIC 3800Australia Department of ChemistryFaculty of Natural SciencesImperial College LondonExhibition RoadSouth KensingtonLondon SW72AZUK 

出 版 物：《Journal of Analysis and Testing》 (分析检测（英文）)

年 卷 期：2017年第1卷第4期

页      面：335-343页

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：M.P.,and W.L.C.acknowledge Discovery Grants DP110100713,DP140100883,DP120100170,and DP140100052 the Melbourne Centre for Nanofabrication(MCN)in the Victorian Node of the Australian National Fabrication Facility(ANFF).D.Sikdar acknowledges Engineering and Physical Sciences Research Council UK’s funding scheme EP/L02098X/1 

主　　题：Self-assembly Pyramid Plasmonics Shape anisotropy Surface-enhanced Raman scattering 

摘      要：Surface-enhanced Raman scattering(SERS)substrates play important roles for the enhancement of inelastic scattering *** substrates such as roughened electrodes and colloidal aggregates suffer from well-known signal reproducibility issues,whereas for current dominant two-dimensional planar systems,the hot spot distributions are limited by the zero-,one-or two-dimensional *** introduction of a three-dimensional(3D)system such as a pyramid geometry breaks the limitation of a single Cartesian SERS-active area and extends it into the z-direction,with the tip potentially offering additional benefits of strong field enhancement and high ***,current 3D pyramidal designs are restricted to film deposition on prepared pyramid templates or self-assembly in pyramidal molds with spherical building blocks,hence limiting their SERS ***,we report on the fabrication of a new class of low cost and well-defined plasmonic nanoparticle pyramid arrays from different anisotropic shaped nanoparticles using combined top-down lithography and bottom-up self-assembly *** pyramids exhibit novel optical scattering properties that can be exploited for the design of reproducible and sensitive SERS *** SERS intensity was found to decrease drastically in accordance with a power law function as the focal planes move from the apex of the pyramid structure towards the *** comparison to sphere-based building blocks,pyramids assembled from anisotropic rhombic dodecahedral gold nanocrystals with numerous sharp tips exhibited the strongest SERS *** Abstract Macroscale pyramidal array films with plasmonic tunability as a new class of SERS substrate for sensitive detection of chemicals.