Fig. 2. Doped semiconductor substrates and SERS activity. (a) Crystal structure of TiO2 and hydrogenated TiO2 and Raman spectra of R6G on TiO2 with different levels of hydrogenation. Reproduced with permission from ref. 42. Copyright 2018, American Chemical Society. (b) EDX analysis of Al-intercalated WO3 and its SERS performance characterization. Reproduced with permission with ref. 43. Copyright 2019, Springer Nature. (c) STM images of N-doped graphene under different synthesis conditions and SERS performance characterization. Reproduced with permission from ref. 61. Copyright 2016, AAAS.
