Water Adsorption Behavior on a Highly Dense Single-Walled Carbon Nanotube Film with an Enhanced Interstitial Space

[Image: see text] In this study, we describe the adsorption behavior of water (H(2)O) in the interstitial space of single-walled carbon nanotubes (SWCNTs). A highly dense SWCNT (HD-SWCNT) film with a remarkably enhanced interstitial space was fabricated through mild HNO(3)/H(2)SO(4) treatment. The N(2), CO(2), and H(2) adsorption isotherm results indicated remarkably developed micropore volumes (from 0.10 to 0.40 mL g(–1)) and narrower micropore widths (from 1.5 to 0.9 nm) following mild HNO(3)/H(2)SO(4) treatment, suggesting that the interstitial space was increased from the initial densely-packed network assembly structure of the SWCNTs. The H(2)O adsorption isotherm of the HD-SWCNT film at 303 K showed an increase in H(2)O adsorption (i.e., by ∼170%), which increased rapidly from the critical value of relative pressure (i.e., 0.3). Despite the remarkably enhanced adsorption capacity of H(2)O, the rates of H(2)O adsorption and desorption in the interstitial space did not change. This result shows an adsorption behavior different from that of the fast transport of H(2)O molecules in the internal space of the SWCNTs. In addition, the adsorption capacities of N(2), CO(2), H(2), and H(2)O molecules in the interstitial space of the HD-SWCNT film showed a linear relationship with the kinetic diameter, indicating an adsorption behavior that is highly dependent on the kinetic diameter.