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首页> 外文期刊>Physica, B. Condensed Matter >The effect of temperature on the TCVD growth of CNTs from LPG over Pd nanoparticles prepared by laser ablation
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The effect of temperature on the TCVD growth of CNTs from LPG over Pd nanoparticles prepared by laser ablation

机译：温度对激光烧蚀制备的Pd纳米颗粒上LPG上CNTs的TCVD生长的影响

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摘要

TCVD growth of multiwalled carbon nanotubes (MWCNTs) was reported by catalytic decomposition of liquefied petroleum gas (LPG) at a temperature range of 580800 °C. Laser ablation was employed as a simple and rapid technique to produce Pd nanoparticles which possess effective catalytic activities for CNT synthesis. UVvisible spectroscopy and TEM images confirmed that the Pd nanoparticles are stable for a long time and have rather spherical shape with average size of 7 nm. SEM and TEM observations and Raman spectroscopy demonstrated that the CNTs have a wavy structure, dense morphology and acceptable crystallinity. Since Pd nanoparticles are inactivated or agglomerated at extremes of the investigated temperature range, the best result of CNT synthesis was obtained at moderate temperatures. It was found that by increasing the growth temperature, crystallinity of grown CNTs is improved; however, strong agglomeration of Pd nanoparticles at high growth temperature prevents further improvement. The grown CNTs can be classified into two categories: one category includes straighter CNTs with smaller diameters and the other includes CNTs with more wavy morphology and larger diameters. The results provide a low cost, versatile and flexible growth of carbon nanotubes over Pd nanocatalysts.
机译：据报道，在580800°C的温度范围内，液化石油气（LPG）的催化分解表明多壁碳纳米管（MWCNT）的TCVD生长。激光烧蚀被用作一种简单而快速的技术来生产具有对CNT合成有效催化活性的Pd纳米粒子。紫外可见光谱和TEM图像证实了Pd纳米粒子长期稳定并且呈球形，平均尺寸为7 nm。 SEM和TEM观察以及拉曼光谱表明，CNT具有波浪状结构，致密的形态和可接受的结晶度。由于Pd纳米颗粒在研究温度范围的极端条件下失活或团聚，因此在中等温度下可获得CNT合成的最佳结果。已经发现，通过提高生长温度，可以提高生长的CNT的结晶度。然而，在高生长温度下，Pd纳米颗粒强烈团聚会阻止进一步的改善。生长的碳纳米管可分为两类：一类包括直径较小的直碳纳米管，另一类包括具有较大波浪形和较大直径的碳纳米管。结果提供了碳纳米管在Pd纳米催化剂上的低成本，通用和灵活的生长。

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