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Continuous double-walled carbon nanotube (DWCNT) films were synthesized using an Fe–Mo catalyst by the arc discharge method. This new catalyst has dramatically improved the purity and selectivity of DWCNT product. High-resolution transmission electron microscopy indicates that the outer and inner diameter of DWCNT are 1.9–4.7nm and 1.2–3.8nm, respectively. The field emission properties of DWCNT films...
Nitrogen-doped carbon nanotubes (CNTs) are known to be better field emitters than the pristine ones. But the field emissions (FE) property closely depends on what kinds of nitrogen moieties are substituted in the CNT matrix. While graphitic N-substituents (gN) give rise to additional sub-levels in the unoccupied states near the Fermi level, pyridinic N-substituents (pN) destroy the existing sub-levels...
Using conventional chemical vapor deposition at 800°C at atmospheric pressure, N-doped carbon nanotubes (CNTs) were grown from two precursors: (i) from a cage-like carbon source: camphor, using dimethylformamide (DMF) as a nitrogen source; and (ii) from a linear-chain aminohydrocarbon: octadecylamine, as a dual source of carbon and nitrogen. The study suggests that the molecular structure of the precursor...
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