▎ 摘　　要

The large surfaces of two-dimensional carbon-based materials, such as graphene and fluorographene, are exposed to analytes, impurities and other guest molecules, so an understanding of the strength and nature of the molecule-surface interaction is essential for their practical applications. Using inverse gas chromatography, we determined the isosteric adsorption enthalpies and entropies of six volatile organic molecules (benzene, toluene, cyclohexane, n-hexane, 1,4-dioxane, and nitromethane) to graphene and graphite fluoride powders. The adsorption entropies of the molecules ranged from -17 to -34 cal/mol K and the maximum adsorption-induced entropy loss occurred for nitromethane at the high-energy sites. The enthalpies of bulkier adsorbates were almost coverage-independent on both surfaces and ranged from -11 to -14 kcal/mol. Despite the fact that fluorographene has lower surface energy than graphene and graphene represents an ideal surface for the pi-pi stacking, the adsorbates had lower adsorption enthalpies to fluorographene than to graphene by similar to 9%. These findings imply that bulkier airbone organic contaminants readily adsorb to the investigated surfaces and can modify the measured surface properties. (C) 2016 The Authors. Published by Elsevier Ltd.