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Novel growth method of carbon nanotubes using catalyst-support layer developed by alumina grit blasting

机译：利用氧化铝喷砂开发的催化剂支撑层生长碳纳米管的新方法

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We propose an efficient method of growing carbon nanotube (CNT) arrays on a variety of metals, alloys, and carbon materials using chemical vapor deposition (CVD) assisted by a simple surface treatment of the materials. The main feature of this method is the application of grit blasting with fine alumina particles to the development of a catalyst-support layer required for the growth of CNTs on various conductive materials, including ultra-hard metals such as tungsten. Auger electron spectroscopy shows that grit blasting can form a non-continuous layer where alumina nanoparticles are embedded as residues in the blasting media left on the treated surfaces. This work reveals that such a non-continuous alumina layer can behave as the catalyst-support layer, which is generally prepared by sputter or a vacuum evaporation coating process that considerably restricts the practical applications of CNTs. We have attempted to grow CNTs on grit-blasted substrates of eighteen conventionally used conductive materials using CVD together with a floating iron catalyst. The proposed method was successful in growing multi-walled CNT arrays on the grit-blasted surfaces of all the examined materials, demonstrating its versatility. Furthermore, we found that the group IV metal oxide films thermally grown on the as-received substrates can support the catalytic activity of iron nanoparticles in the CVD process just as well as the alumina film developed by grit blasting. Spectral emissivity of the CNT arrays in the visible and infrared wavelength ranges has been determined to assess the applicability of the CNT arrays as a black coating media.
机译：我们提出了一种通过化学气相沉积（CVD）在简单的材料表面处理辅助下在各种金属，合金和碳材料上生长碳纳米管（CNT）阵列的有效方法。该方法的主要特征是将细氧化铝颗粒喷砂处理用于开发在各种导电材料（包括钨等超硬金属）上生长CNT所需的催化剂载体层。俄歇电子能谱显示喷砂可形成不连续的层，氧化铝纳米颗粒作为残留物嵌入残留在处理过的表面的喷砂介质中。这项工作表明，这种不连续的氧化铝层可以充当催化剂载体层，通常通过溅射或真空蒸发涂覆工艺制备，这大大限制了CNT的实际应用。我们尝试使用CVD和浮铁催化剂在18种常规使用的导电材料的喷砂处理基材上生长CNT。所提出的方法成功地在所有被检查材料的喷砂表面上生长了多壁CNT阵列，证明了其多功能性。此外，我们发现，在原样基板上热生长的IV类金属氧化物膜与通过喷砂处理开发的氧化铝膜一样，可以支持CVD工艺中铁纳米颗粒的催化活性。已经确定了在可见和红外波长范围内的CNT阵列的光谱发射率，以评估CNT阵列作为黑色涂层介质的适用性。

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