The structural and electronic behavior of BLG under high pressure has also been investigated in the presence of other polar pressuretransmitting media (PTM), such as methanol and 4:1 methanol/ethanol mixtures. Nicole et al. and Forestier et al. have detected a strong piezo-doping effect on BLG layers at the interface with alcohol in the 1-10 GPa pressure range, by monitoring the evolution of the Raman G band, which is sensitive to carbon layer strain and doping. The Authors attribute the molecular origin of this phenomenon to electronic doping induced by surface adsorbates, resulting from the decrease in the methanol-BLG distance as pressure increases.