Fast Fabrication and Judgement of Tip-Enhanced Raman Spectroscopy-Active Tips  

针尖增强拉曼活性探针的快速制备与判定

作　　者：Xian-Biao Zhang Yu-Fan Zhang Hang Li Jie Cui Song Jiang Ben Yang Yang Zhang Yao Zhang Zhen-Chao Dong 张先彪;张宇帆;李航;崔杰;江嵩;杨犇;张杨;张尧;董振超(中国科学技术大学合肥微尺度物质科学国家研究中心,合肥230026)

机构地区：[1]Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information&Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2022年第5期713-719,I0011,共8页化学物理学报（英文）

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);the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB36000000);Anhui Initiative in Quantum Information Technologies(No.AHY090100)。

摘　　要：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.

关 键 词：Tip-enhanced Raman spectroscopy Tip-enhanced Raman spectroscopy-active tip Atomistic protrusion Image potential state 

分 类 号：O657.37[理学—分析化学]