[1] K Jeon, M Kim H, D Lim et al. Nature Materials, 9, 60(2010).

[2] M Fleischmann, J Hendra P, J Mcquillan A. Chemical Physics Letters, 26, 163(1974).

[3] L Jeanmaire D, R P Van Duyne. J. Electroanal. Chem. Interfacial Electrochem, 84, 1(1977).

[4] J Jahn I, K Weber, S Zheng X et al. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 197, 56(2018).

[5] T Hughes, H Ilkhani, J Zhong C et al. Biosensors and Bioelectronics, 80, 257(2016).

[6] T Ertsgaard C, M Mckoskey R, S Rich I et al. ACS Nano, 8, 10941(2014).

[7] D Graham, L Guerrini. Chemical Society Reviews, 41, 7085(2012).

[8] C Shi G, L Wang M, Y Zhu Y et al. Beilstein Journal of Nanotechnology, 10, 578(2019).

[9] H Guo G, M Muhammad, J Zhong et al. Talanta, 207, 120324(2020).

[10] B Xu B, Y Zhang W, L Zhang Y et al. Advanced Optical Materials, 1, 56(2013).

[11] J Cao, H Mao Q. ChemistrySelect, 1, 1784(2016).

[12] F Geng Y, N Wang L, W Xu Y et al. Journal of Physics D: Applied Physics, 51, 285104(2018).

[13] R Ravindran T, G Smitha K, L Smitha S et al. Nanotechnology, 22, 265705(2011).

[14] D Andrea C, F Bonaccorso, A Foti et al. Plasmonics, 8, 13(2013).

[15] W Colletter T, R Ekman D, M Parsons et al. Analyst, 134, 478(2009).

[16] T H C Hoang, V H Pham, B Pham T et al. Scientific Reports, 9, 238(2019).