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. 2019 Mar 18;7:121. doi: 10.3389/fchem.2019.00121

Figure 4.

Figure 4

σdc electrical conductivity of the investigated samples (identified by the GL amount); in the inset, the time-decay of σdc for EU and EUGLs samples is reported. Measurements have been performed at controlled condition of relative humidity (RU) of about 25%.