Does the Intensity of the G (1590/cm) peak (in the Raman spectra) increase as the graphene flakes become thinner (i.e less number of layers)?

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Md.Akibul Islam

Can anyone please help on this?

Rafael Valentin Tolentino-Hernandez

A higher intensity of the G band of graphene sample is said to be crystalline, whereas D band indicates the extent of defects. Both D and G bands confirms the formation of graphene with lesser defects and crystalline structure. Now if the number of layers is less than (between 5 and 10 I don't remember the rigth value at the moment) the intensity of 2D band (or also known G') becomes higher than G band, so the increase of the ratio between the intensity of G and 2D bands (IG/I2D) directly indicates an increases in the number of graphene layers.