| http://www.w3.org/ns/prov#value | - other metals such as Ag, Pd, Au, Cu, Rh, Pb [14-19], Mg, Mn, Cr, Sn and Al [20,21], semiconductors such as Si and Ge [16], carbides such as SiC [16], Fe3C [22] and more recently even oxides including SiO2, Al2O3, TiO2 have been reported to be active for SWNT growth [23].
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