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首页> 外文期刊>Applied Surface Science >Synthesis Of Carbon Nanotubes By Cvd: Effect Of Acetylene Pressure On Nanotubes Characteristics
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Synthesis Of Carbon Nanotubes By Cvd: Effect Of Acetylene Pressure On Nanotubes Characteristics

机译：Cvd合成碳纳米管：乙炔压力对纳米管性能的影响

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摘要

The effect of acetylene partial pressure on the structural and morphological properties of multi-walled carbon nanotubes (MWCNTs) synthesized by CVD on iron nanoparticles dispersed in a SiO_2 matrix as catalyst was investigated. The general growing conditions were: 110 cm~3/ min flow rate, 690 ℃ synthesis temperature, 180 Torr over pressure and two gas compositions: 2.5% and 10% C_2H_2/N_2. The catalyst and nanotubes were characterized by HR-TEM, SEM and DRX. TGA and DTA were also carried out to study degradation stages of synthesized CNTs. MWCNTs synthesized with low acetylene concentration are more regular and with a lower amount of amorphous carbon than those synthesized with a high concentration. During the synthesis of CNTs, amorphous carbon nanoparticles nucleate on the external wall of the nanotubes. At high acetylene concentration carbon nanoparticles grow, covering all CNTs' surface, forming a compact coating. The combination of CNTs with this coating of amorphous carbon nanoparticles lead to a material with high decomposition temperature.
机译：研究了乙炔分压对分散在SiO_2基体中的铁纳米粒子的催化化学气相沉积合成的多壁碳纳米管（MWCNTs）的结构和形态性能的影响。一般的生长条件为：流速为110 cm〜3 / min，合成温度为690℃，超压为180 Torr，两种气体成分为2.5％和10％C_2H_2 / N_2。通过HR-TEM，SEM和DRX对催化剂和纳米管进行了表征。还进行了TGA和DTA研究合成的CNTs的降解阶段。与高浓度合成的那些相比，低乙炔浓度合成的MWCNT更规则，并且无定形碳的含量也更低。在CNT的合成过程中，无定形碳纳米颗粒在纳米管的外壁上成核。在高乙炔浓度下，碳纳米颗粒会生长，覆盖所有CNT的表面，形成致密的涂层。 CNT与这种无定形碳纳米颗粒涂层的结合导致材料具有高分解温度。

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