Abstract
A new superhard phase of single-wall carbon nanotube (SP-SWNT) has been synthesized under non-hydrostatic compression at room temperature. The SP-SWNT was studied in comparison with diamond and ultrahard fullerite. The high mechanical properties of SP-SWNT, namely the bulk modulus (465 GPa) exceeding that of diamond and hardness (62–150 GPa) belonging to the range between cubic BN and diamond, the preservation of Raman bands of SWNT in SP-SWNT along with band broadening and absence of new bands (within the detection limit), are characteristics of the new phase.
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