Morphology‐Controllable CVD Synthesis of Carbon Nanomaterials on an Alkali‐Element‐Doped Cu Catalyst.

Abstract

Nanotechnology V 1505Morphology-Controllable CVD Synthesis of Carbon Nanomaterials on an Alkali-Element-Doped Cu Catalyst. -Carbon nanomaterials are prepared by c hemical vapor deposition using an acetylene/NH3/N2 flow in the presence of an alkali metal-doped Cu catalyst (synthesized by combustion of a mixture of Cu(NO3)2, NaNO3, Mg(NO3)2, and citric acid at 500°C). By controlling the reaction temperature, various products such as multibranched carbon nanotubes, carbon nanotubes filled with Cu nanocones at the tips (Cu-CNTs), and Cu-CNTs with carbon nanofiber tails are obtained. The synthesized carbon nanomaterials have fascinating potential applications in nanometer-sized electronic devices, especially in field-emission applications. -(TAO, X.; ZHANG*, X.; CHENG, J.; LIU, F.; LUO, J.; LUO, Z.; Chem. Vap.