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Block-copolymer assisted synthesis of arrays of metal nanoparticles and their catalytic activities for the growth of SWNTs

机译：嵌段共聚物辅助的金属纳米颗粒阵列的合成及其对单壁碳纳米管生长的催化活性

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Block copolymer micellar templates were used for the controlled synthesis of large arrays of mono-metallic (Fe, Co, Ni, Mo) and bi-metallic (Fe-Mo) nanoparticles with average diameters ranging from 1 to 4 nm and the distance between the nanoparticles ranging from 40 to 45 nm. XPS data reveal the presence of mono-metallic nanoparticles in their oxidized states. These uniform arrays of nanoparticles serve as an excellent tool to investigate the catalytic effect of different metal/metal oxide nanoparticles for the growth of carbon nanotubes, and in this work, they were used to investigate the growth of single-walled carbon nanotubes with the chemical vapour deposition (CVD) process, using both ethanol and hydrocarbon (methane + ethylene) gases as carbon sources. The periodicity and the arrangement of nanoparticles were unaffected even at high growth temperatures, indicating that nanoparticle agglomeration on the Si substrate does not take place during growth. AFM and SEM results reveal uniform growth of nanotubes with diameters smaller than the initial size of the catalyst nanoparticles. The Fe, Co and Ni nanoparticles all serve as effective catalysts for nanotube growth with both types of carbon feed stock, and Co and Ni give rise to a relatively higher yield than Fe. The catalytic activity of Fe and bi-metallic Fe-Mo nanoparticles of similar size and identical densities using ethanol CVD are also compared.
机译：嵌段共聚物胶束模板用于受控合成平均直径范围为1-4 nm的单金属（Fe，Co，Ni，Mo）和双金属（Fe-Mo）纳米粒子的大阵列。纳米粒子范围从40到45 nm。 XPS数据揭示了处于氧化态的单金属纳米颗粒的存在。这些均匀的纳米颗粒阵列是研究不同金属/金属氧化物纳米颗粒对碳纳米管生长的催化作用的极佳工具，在这项工作中，它们被用于研究化学作用下单壁碳纳米管的生长。气相沉积（CVD）工艺，使用乙醇和碳氢化合物（甲烷+乙烯）气体作为碳源。即使在高生长温度下，纳米颗粒的周期性和排列也不会受到影响，这表明在生长过程中不会在Si衬底上发生纳米颗粒的团聚。 AFM和SEM结果表明，直径小于催化剂纳米颗粒初始尺寸的纳米管均匀生长。 Fe，Co和Ni纳米颗粒都可以用作两种类型的碳原料的纳米管生长的有效催化剂，并且Co和Ni的产率比Fe高。还比较了使用乙醇CVD的相似大小和相同密度的Fe和双金属Fe-Mo纳米颗粒的催化活性。

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