Beyond the Charge Transfer Mechanism for 2D Materials-Assisted Surface Enhanced Raman Scattering

被引:2
作者
Wang, Shuo [1 ]
Wei, Youchao [1 ]
Zheng, Siyang [1 ]
Zhang, Zhaofu [3 ,4 ]
Tang, Xi [2 ]
Liang, Liangbo [5 ]
Zang, Zhigang [1 ]
Qian, Qingkai [1 ]
机构
[1] Chongqing Univ, Coll Optoelect Engn, Key Lab Optoelect Technol & Syst, Minist Educ, Chongqing 400044, Peoples R China
[2] Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China
[3] Wuhan Univ, Inst Technol Sci, Wuhan 430072, Peoples R China
[4] Wuhan Univ, Hubei Key Lab Elect Mfg & Packaging Integrat, Wuhan 430072, Peoples R China
[5] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
基金
中国国家自然科学基金;
关键词
GRAPHENE; BENZENE; SPECTRA; MOS2;
D O I
10.1021/acs.analchem.4c01051
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Two-dimensional (2D) materials have been extensively implemented as surface-enhanced Raman scattering (SERS) substrates, enabling trace-molecule detection for broad applications. However, the accurate understanding of the mechanism remains elusive because most theoretical explanations are still phenomenological or qualitative based on simplified models and rough assumptions. To advance the development of 2D material-assisted SERS, it is vital to attain a comprehensive understanding of the enhancement mechanism and a quantitative assessment of the enhancement performance. Here, the microscopic chemical mechanism of 2D material-assisted SERS is quantitatively investigated. The frequency-dependent Raman scattering cross sections suggest that the 2D materials' SERS performance is strongly dependent on the excitation wavelengths and the molecule types. By analysis of the microscopic Raman scattering processes, the comprehensive contributions of SERS can be revealed. Beyond the widely postulated charge transfer mechanisms, the quantitative results conclusively demonstrate that the resonant transitions within 2D materials alone are also capable of enhancing the molecular Raman scattering through the diffusive scattering of phonons. Furthermore, all of these scattering routines will interfere with each other and determine the final SERS performance. Our results not only provide a complete picture of the SERS mechanisms but also demonstrate a systematic and quantitative approach to theoretically understand, predict, and promote the 2D materials SERS toward analytical applications.
引用
收藏
页码:9917 / 9926
页数:10
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