Improve the plasmonic optical tunability of Au nanorod by Pt coating: the application in refractive index sensingJian Zhu, Li-na Meng, Guo-jun Weng, Jian-jun Li and Jun-wu ZhaoEur. Phys. J. D, 75 7 (2021) 192DOI: https://doi.org/10.1140/epjd/s10053-021-00195-4