▎ 摘　　要

Surface potential distribution, V-CPD, and evolution of atmospheric adsorbates on few and multiple layers (FLG and MLG) of graphene grown on SiC(000 (1) over bar) substrate have been investigated by electrostatic and Kelvin force microscopy techniques at T = 20-120 degrees C. The change of the surface potential distribution, Delta V-CPD, between FLG and MLG is shown to be temperature dependent. The enhanced Delta V-CPD value at 120 degrees C is associated with desorption of adsorbates at high temperatures and the corresponding change of the carrier balance. The nature of the adsorbates and their evolution with temperature are considered to be related to the process of adsorption and desorption of the atmospheric water on MLG domains. We demonstrate that both the nano- and microscale wettability of the material are strongly dependent on the number of graphene layers.