"We have fabricated the lightest free-standing monolithic MWCNT aerogels with a density of 4 mg/cm3. The strong chemical bonding interactions between MWCNTs played a key role in the fabrication, which was proved both experimentally and theoretically. The MWCNT aerogel has an anisotropic macroporous honeycomb structure with straight and parallel honeycomb channels and mesoporous honeycomb walls. The MWCNT aerogel is a hierachically porous material with a surface area of 580 m2/g and electrical conductivity of 3.2 × 10−2 S·cm−1 (0.67 S·cm−1 after high-current pulse treatment). The MWCNT aerogel demonstrates excellent compression recovery property. The unique anisotropic honeycomb structure combined with the hierarchical porosity with large surface area, compression recovery property, and high electrical conductivity makes the MWCNT aerogel promising for applications as chemoresistant vapor sensor and ultrasensitive pressure sensor. Other potential applications of the MWCNT aerogel may include catalyst supports and novel electrodes."
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