Pore characterization of multi-walled carbon nanotubes modified by KOH

Multi-walled carbon nanotubes (MWNTs) were modified by KOH in order to obtain high surface area with micropores. Pore characterization of modified MWNTs was performed with the observation of adsorption–desorption isotherms of N2. According to the modification temperature of MWNTs increases, the specific surface area of MWNTs increases from 407 to 650 m2 g−1, on the other hand, the average pore width decreases from 2.77 to 2.13 nm. The isosteric heat value (qst, ϕ = 1/e) of modified MWNTs increased with the rise of modification temperature. The qst, ϕ = 1/e of MWNTs increased in inverse proportion to the average pore width (w) and depended on the pore width.