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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Multiwalled Carbon Nanotube Microspheres from Layer-by-Layer Assembly and Calcination
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Multiwalled Carbon Nanotube Microspheres from Layer-by-Layer Assembly and Calcination

机译：多层组装和煅烧的多壁碳纳米管微球

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摘要

Multiwalled carbon nanotube (MWNT) microspheres were fabricated by layer-by-layer (LBL) assembling of modified MWNTs and poly(diallyldimethylammonium chloride) (PDDA) via electrostatic interactions on poly(methacrylic acid) (PMAA) microspheres and subsequent calcination. The MWNT/PDDA film growth on planar substrates monitored by scanning electron microscopy (SEM) and UV—vis spectrophotometry demonstrated the success of uniform LBL assembly. SEM observations of the stepwise increase in MWNT thickness on PMAA microspheres with the increase of LBL cycle number indicated the efficiency of the spherical assembly. Upon calcination of the (MWNT/PDDA)/PMAA microspheres in air at 400 °C for 2 h to remove the PMAA templates, the resulting MWNTs exhibited microsphere morphology with diameters that are half those of their precursors. Transmission electron microscopic images revealed that the MWNT microspheres were not solid, but loose and porous. It is proposed that the MWNT layers shrink during the calcination and form such microsphere structure due to the van der Waals attractions between the nanotubes.
机译：多壁碳纳米管（MWNT）微球是通过修饰的MWNT和聚（二烯丙基二甲基氯化铵）（PDDA）通过聚（甲基丙烯酸）（PMAA）微球上的静电相互作用进行逐层组装（LBL）制成的。通过扫描电子显微镜（SEM）和紫外可见分光光度法监测的MWNT / PDDA薄膜在平面基板上的生长证明了均匀LBL组装的成功。 SEM观察到随着LBL循环数的增加，PMAA微球上MWNT厚度逐步增加，表明了球形组件的效率。在空气中（MWNT / PDDA）/ PMAA微球在400°C下煅烧2小时以去除PMAA模板后，所得MWNTs呈现出微球形态，其直径是其前驱物直径的一半。透射电子显微镜图像显示，MWNT微球不是固体，而是疏松和多孔的。提出由于纳米管之间的范德华力吸引，MWNT层在煅烧期间收缩并形成这种微球结构。

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