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Uniform thin tubular carbon nanofibers (TCNFs), composed of two nanofibrils ca. 20 nm in diameter and with relatively high graphitic property, were prepared using a chemical deposition method from a C...O/H_2 gas mix (1:4 v/v) over a novel bimetallic (Fe–Mn, 3:7 w/w) catalyst at a low temperature of 500–540 °C. Mn effectively activated the Fe catalyst when preparing selective thin TCNFs. The specific amount of Mn 70 wt % on the Fe–Mn catalyst was key for the selective preparation of uniform duplicated CNFs with an aligned tubular graphene structure. The obtained TCNFs had relatively high graphitic property; the interlayer spacing (d_<002>) and the stacking height Lc(002) were <0.3420 and >5.4 nm, respectively, because of the unique duplicated morphology.続きを見る
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