Premade Nanoparticle Films for the Synthesis of Vertically Aligned Carbon Nanotubes
Premade Nanoparticle Films for the Synthesis of Vertically Aligned Carbon Nanotubes
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DOI：
10.3390/c7040079
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
A. Hoque;Ahamed Ullah;B. Guiton;N. Alvarez
中科院分区：
文献类型：
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作者：
A. Hoque;Ahamed Ullah;B. Guiton;N. Alvarez
碳纳米管（CNT）具有独特的性能，有可能解决工业和材料科学中的多种问题。虽然已经开发了许多合成方法，但是仍然难以控制CNT特性。在这里，与实现这样的控制的目标，我们报告了一个自下而上的CNT合成过程中，单层的预制氧化铝（Al 2 O3）和氧化铁（Fe 3 O 4）的纳米粒子被锚定在一个平面的氧化硅（SiO2）基板。使用11-膦酰基十一烷酸作为双功能连接体，实现了油酸稳定的Al 2 O3纳米颗粒的纳米颗粒分散体和单层组装，其中膦酸酯基团结合到SiO2基底和末端羧酸酯基团结合到纳米颗粒。随后，使用相同的方法在Al 2 O3层上形成Fe 3 O 4单层。组装的Al 2 O3和Fe 3 O 4纳米颗粒单层分别作为催化剂载体和催化剂，用于垂直排列的CNT的生长。以乙炔为碳前驱体，采用常压化学气相沉积法成功制备了碳纳米管。因此，这些纳米颗粒膜提供了一种生产均匀CNT的简便且廉价的方法。
Carbon nanotubes (CNTs) offer unique properties that have the potential to address multiple issues in industry and material sciences. Although many synthesis methods have been developed, it remains difficult to control CNT characteristics. Here, with the goal of achieving such control, we report a bottom-up process for CNT synthesis in which monolayers of premade aluminum oxide (Al2O3) and iron oxide (Fe3O4) nanoparticles were anchored on a flat silicon oxide (SiO2) substrate. The nanoparticle dispersion and monolayer assembly of the oleic-acid-stabilized Al2O3 nanoparticles were achieved using 11-phosphonoundecanoic acid as a bifunctional linker, with the phosphonate group binding to the SiO2 substrate and the terminal carboxylate group binding to the nanoparticles. Subsequently, an Fe3O4 monolayer was formed over the Al2O3 layer using the same approach. The assembled Al2O3 and Fe3O4 nanoparticle monolayers acted as a catalyst support and catalyst, respectively, for the growth of vertically aligned CNTs. The CNTs were successfully synthesized using a conventional atmospheric pressure-chemical vapor deposition method with acetylene as the carbon precursor. Thus, these nanoparticle films provide a facile and inexpensive approach for producing homogenous CNTs.