Niobium pentoxide:a promising surface-enhanced Raman scattering active semiconductor substrate

查看全文 作　　者：Yufeng [1,2]Shan;Zhihui [1,2]Zheng;Jianjun [1,2]Liu;Yong [1,2]Yang;Zhiyuan [3]Li;Zhengren [1,2]Huang;Dongliang [1]Jiang

机构地区：[1]State Key Laboratory of High Performance Ceramics and Superfine Microstructures,Shanghai Institute of Ceramics,Chinese Academy of Sciences,1295 Dingxi Road,Shanghai 200050,China;[2]Graduate School of the Chinese Academy of Sciences,Beijing,China;[3]Institute of Physics,Chinese Academy of Sciences,Beijing,PR 100080,China

出　　处：《npj Computational Materials》索引2017年第1期,共7页

基　　金：the finical support of the National Natural Science Foundation of China(No.51471182). 摘　　要：Surface-enhanced Raman scattering technique,as a powerful tool to identify the molecular species,has been severely restricted to the noble metals.The surface-enhanced Raman scattering substrates based on semiconductors would overcome the shortcomings of metal substrates and promote development of surface-enhanced Raman scattering technique in surface science,spectroscopy,and biomedicine studies.However,the detection sensitivity and enhancement effects of semiconductor substrates are suffering from their weak activities.In this work,a semiconductor based on Nb_(2)O_(5) is reported as a new candidate for highly sensitive surfaceenhanced Raman scattering detection of dye molecules.The largest enhancement factor value greater than 107 was observed with the laser excitation at 633 and 780 nm for methylene blue detection.As far as literature review shows,this is in the rank of the highest sensitivity among semiconductor materials;even comparable to the metal nanostructure substrates with“hot spots”.The impressive surface-enhanced Raman scattering activities can be attributed to the chemical enhancement dominated by the photoinduced charge transfer,as well as the electromagnetic enhancement,which have been supported by the density-functional-theory and finite element method calculation results.The chemisorption of dye on Nb_(2)O_(5) creates a new highest occupied molecular orbital and lowest unoccupied molecular orbital contributed by both fragments in the molecule-Nb_(2)O_(5) system,which makes the charge transfer more feasible with longer excitation wavelength.In addition,the electromagnetic enhancement mechanism also accounts for two orders of magnitude enhancement in the overall enhancement factor value.This work has revealed Nb_(2)O_(5) nanoparticles as a new semiconductor surface-enhanced Raman scattering substrate that is able to replace noble metals and shows great potentials applied in the fields of biology related. 关键词：SCATTERING SURFACE EXCITATION

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Niobium pentoxide:a promising surface-enhanced Raman scattering active semiconductor substrate

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