Carbon Nanotubes, Gas Adsorption on
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Carbon nanotubes, single or multiwalled, have been the object of a large amount of studies since their discovery in the last decade of the 20th century. Those studies revealed the nature of this material, its chemical structure, and many of its physical and chemical properties. Almost immediately after its discovery, a major technological application was envisioned as potential medium to store hydrogen, and other gases employed as fuel. Despite the large amount of work performed in this area, there is no agreement in many basic questions concerning the gas storage capacity of this material. Here we review the work performed in the area of gas adsorption on carbon nanotubes. Those studies aimed to determine the adsorption capacity of different gases, to characterize the structure of the material through the adsorption of nitrogen, to explore the molecular sieving properties of nanotubes, and to test models involving matter in quasi one-dimension or in confined spaces.