The quality of the scanning tip is crucial for tip-enhanced Raman spectroscopy(TERS)experiments towards large signal enhancement and high spatial resolution.In this work,we report a controllable fabrication method to ...The quality of the scanning tip is crucial for tip-enhanced Raman spectroscopy(TERS)experiments towards large signal enhancement and high spatial resolution.In this work,we report a controllable fabrication method to prepare TERS-active tips by modifying the tip apex at the atomic scale,and propose two important criteria to in-situ judge the tip’s TERS activity for tip-enhanced Raman measurements.One criterion is based on the downshift of the first image potential state to monitor the coupling between the far-field incident laser and near-field plasmon;the other is based on the appearance of the low-wavenumber Raman peaks associated with an atomistic protrusion at the tip apex to judge the coupling efficiency of emissions from the near field to the far field.This work provides an effective method to quickly fabricate and judge TERS-active tips before real TERS experiments on target molecules and other materials,which is believed to be instrumental for the development of TERS and other tip-enhanced spectroscopic techniques.展开更多
采用微波辅助三乙醇胺还原法制备了表面高度分支化、具有较高表面增强拉曼散射(surface-enhanced Raman scattering,SERS)活性的金纳米花(gold nano-flower,AuNF)溶胶。利用透射电镜(trarsmission electron microscopy,TEM)表征AuNF的...采用微波辅助三乙醇胺还原法制备了表面高度分支化、具有较高表面增强拉曼散射(surface-enhanced Raman scattering,SERS)活性的金纳米花(gold nano-flower,AuNF)溶胶。利用透射电镜(trarsmission electron microscopy,TEM)表征AuNF的形貌与粒径大小,并以维多利亚蓝B(Victoria blue B,VBB)为探针分子测SERS光谱,结合金纳米花溶胶的紫外-可见吸收光谱、共振瑞利散射光谱,可判断微波20s条件下制备的AuNF溶胶其SERS活性最强。展开更多
基金supported by the National Key R&D Program of China(No.2016YFA0200600)the National Natural Science Foundation of China(No.21790352,No.22174135)+1 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB36000000)Anhui Initiative in Quantum Information Technologies(No.AHY090100)。
文摘The quality of the scanning tip is crucial for tip-enhanced Raman spectroscopy(TERS)experiments towards large signal enhancement and high spatial resolution.In this work,we report a controllable fabrication method to prepare TERS-active tips by modifying the tip apex at the atomic scale,and propose two important criteria to in-situ judge the tip’s TERS activity for tip-enhanced Raman measurements.One criterion is based on the downshift of the first image potential state to monitor the coupling between the far-field incident laser and near-field plasmon;the other is based on the appearance of the low-wavenumber Raman peaks associated with an atomistic protrusion at the tip apex to judge the coupling efficiency of emissions from the near field to the far field.This work provides an effective method to quickly fabricate and judge TERS-active tips before real TERS experiments on target molecules and other materials,which is believed to be instrumental for the development of TERS and other tip-enhanced spectroscopic techniques.
文摘采用微波辅助三乙醇胺还原法制备了表面高度分支化、具有较高表面增强拉曼散射(surface-enhanced Raman scattering,SERS)活性的金纳米花(gold nano-flower,AuNF)溶胶。利用透射电镜(trarsmission electron microscopy,TEM)表征AuNF的形貌与粒径大小,并以维多利亚蓝B(Victoria blue B,VBB)为探针分子测SERS光谱,结合金纳米花溶胶的紫外-可见吸收光谱、共振瑞利散射光谱,可判断微波20s条件下制备的AuNF溶胶其SERS活性最强。
