Currently, the methods that use microwaves to promote the growth of carbon nanotubes (CNT) employ waveguides in their configuration. We describe a method for synthesizing CNT based on the use of a microwave plasma at atmospheric pressure, and maintained by a resonant cavity. The replacement of waveguides by the resonant cavity results in deposition areas greater than 15 cm2, and is therefore not limited by the equipment configuration, since plasma is formed in almost the entire length of the quartz tube. As a result, confirmed by Raman spectroscopy and scanning and transmission electron microscopy, good quality carbon nanotubes were obtained, with an ID/IG ratio less than one unit in addition to the possibility of tuning the nanostructure diameter through process conditions.

中文翻译：

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简单低成本的碳纳米管合成技术

目前，使用微波促进碳纳米管 (CNT) 生长的方法在其配置中采用了波导。我们描述了一种基于在大气压下使用微波等离子体并由谐振腔维持的合成碳纳米管的方法。用谐振腔代替波导导致沉积面积大于 15 cm2，因此不受设备配置的限制，因为等离子体几乎在石英管的整个长度上形成。结果，通过拉曼光谱和扫描和透射电子显微镜证实，获得了高质量的碳纳米管，除了通过工艺条件调整纳米结构直径的可能性之外，ID/IG 比小于 1 个单位。