Dependence of Water Vapour Adsorption on the Polarity of the Graphene Surfaces of Multi-wall Carbon Nanotubes

摘要: The adsorption of water by the graphene surfaces multi-wall carbon nanotubes (MWCNTs) in either untreated (4.3 atom% oxygen) or oxidised (22.3 surface states has been studied. Different concentrations oxygen groups, which have directly measured using XPS, give rise to distinctly different shapes isotherms. Those from materials follow pressure axis lends them a Type III character BDDT classification. However, since they display clear point inflection at lowest pressure, are strictly speaking II isotherms but indicative relatively few polar interactions and weak adsorptivity. In sharp contrast, MWCNTs typically characterised marked positive curvature their low region due increased numbers specific occurring between molecules groups. data were model...