Robust quantitative SERS analysis with Relative Raman scattering intensities

Fengtong Zhao; Weipeng Wang; Haodong Zhong; Fei Yang; Wangyang Fu; Yunhan Ling; Zhengjun Zhang

doi:10.1016/j.talanta.2020.121465

Robust quantitative SERS analysis with Relative Raman scattering intensities

Talanta. 2021 Jan 1:221:121465. doi: 10.1016/j.talanta.2020.121465. Epub 2020 Jul 30.

Authors

Fengtong Zhao¹, Weipeng Wang², Haodong Zhong¹, Fei Yang¹, Wangyang Fu³, Yunhan Ling³, Zhengjun Zhang⁴

Affiliations

¹ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
² Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China. Electronic address: wpwang@mail.tsinghua.edu.cn.
³ Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
⁴ Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China. Electronic address: zjzhang@tsinghua.edu.cn.

PMID: 33076085
DOI: 10.1016/j.talanta.2020.121465

Abstract

Robust quantitative analysis methods are very attractive but challenging with surface-enhanced Raman scattering (SERS) technique till now. Quantitative analysis methods using absolute Raman scattering intensities tend to desire very critical reproducibility of SERS substrates and consistency of testing conditions, as batch differences and inhomogeneity of SERS substrates as well as the fluctuation of measuring parameters placed challenging obstacles. Relative Raman scattering intensities, on the other hand, can release the adverse interferences mentioned above and provide effective and robust information as it is independent of the reproducibility of SERS substrates. By establishing external calibration working curves, we achieved accurate molecule composition prediction of molecules in multi-component systems. Further, by choosing or adding a label molecule with known concentration as Raman internal standards, the concentration of target molecules can be easily predicted. This approach proved the effectiveness and robustness of quantitative analysis with the relative Raman scattering intensities, even carried out with a flexible inhomogeneous SERS substrate.

Keywords: Quantitative analysis; Relative Raman scattering intensities; SERS.