“…Raman spectroscopy stands out as the simplest and most widely used technique for determining the number of graphene layers. The estimation of the layer count can be achieved through three different methods: (i) analysing the intensity of the G band 26,61 and the intensity ratio of the 2D and G bands, 62,63 (ii) examining the frequency of the shear vibration mode, 64,65 and (iii) conducting shape analysis of the 2D band. 62,66,67 Das et al 62 determined the number of graphene layers using the I G /I 2D intensity ratio.…”