Ming-Xi Wangin research he studiesAdsorption of water vapor on graphenenanosheets (GNS) derived by vacuum promoted low temperature exfoliation method was investigate dusing a volumetric system .The pristine and thermally modified GNS were characterized with scanning electron microscopy (SEM) observation ,Fourier transform infrared (FT-IR) analysis and nitrogen adsorption-desorption. There sults show that the absorbed amount of water vapor against the pristine GNS can reach 249 cm³/g at 20 ᵒC, and the capability of water vapor adsorption was weakened by heat treatment at 500 1C and 700 ᵒC, the isosteric heat of water vapor adsorption against GNS is 42.6kJ/mol based on the adsorption isotherms at 10 ᵒC and 30 ᵒC.