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Enhanced RI Sensitivity and SERS Performances of Individual Au Nanobipyramid Dimers

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Abstract

Both the plasmon refractive index (RI) sensitivity and SERS performance of individual Au nanobipyramid (NBP) dimers are numerically investigated by finite element method (FEM). Each of the fractional shift of LSPR peak wavelength \(\lambda_{LSPR}\) of Au NBP dimer’s longitudinal dipole mode and the corresponding RI sensitivity factor \(S\) is unveiled to obey the universal “plasmon ruler” only for the scaled gap size being larger than 0.10, which is well elucidated in terms of the fractional shift of enhanced \(\left| E \right|_{\max }\) around the gap region. The maximum \(S\) and SERS enhancement factor G at gap distances 2 nm of Au NBP dimer are demonstrated to reach 618 nm RIU−1 and 4.5 × 1011, respectively, providing excellent plasmon RI sensitivity and SERS substrates. The enhanced S and G of Au NBP dimer than those of Au nanorod and nanoellipsoid counterparts under the same incident light and dimer geometry configurations are presented and discussed as well, respectively. The present work provides helpful clues for future designing Au dimer-based SERS substrates and LSPR RI sensors for chemical/biological sensing and detection.

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Acknowledgments

This work was financially supported by the Fundamental Research Funds for the Central Universities (No. NS2016074).

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  1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, People’s Republic of China

    TianYi Fu, ChaoLing Du, YangXi Chen, RuXin Zhang, Yan Zhu, Lu Sun & DaNing Shi

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  1. TianYi Fu
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Correspondence to ChaoLing Du.

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Fu, T., Du, C., Chen, Y. et al. Enhanced RI Sensitivity and SERS Performances of Individual Au Nanobipyramid Dimers. Plasmonics 16, 485–491 (2021). https://doi.org/10.1007/s11468-020-01302-8

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