利用升华氯化铁催化剂前驱体制备高产量、高结晶度垂直排列的碳纳米管

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Nano Futures Pub Date : 2023-03-14 DOI:10.1088/2399-1984/acc43c
H. Goktas, N. Lachman, E. Kalfon-Cohen, Xiaoxue Wang, S. Torosian, K. Gleason, B. Wardle
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引用次数: 0

摘要

介绍了一种简单有效的碳纳米管(CNT)阵列生长催化剂沉积工艺,该工艺通过化学气相沉积,利用电阻加热热蒸发技术将FeCl3升华到衬底上。经升华的FeCl3催化剂前驱体的催化活性与经过充分研究的电子束蒸发的Fe催化剂相当,并且得到的垂直排列的碳纳米管(VA-CNTs)具有相似的直径、壁和缺陷,并且提高了整体导电性。与标准电子束沉积的Fe不同,扫描电镜和透射电镜以及x射线光电子能谱表征揭示了fecl3衍生的VA-CNT阵列/森林的尖端生长机制。fecl3衍生的碳纳米管阵列具有较低(约1/3)的纵向压痕模量,但比电子束fe生长的碳纳米管阵列具有更高的纵向电导率(大于两倍)。生长高质量VA-CNTs的升华工艺是一种高度简便和可扩展的工艺(衬底形状和尺寸广泛,真空和温度适中),为合成具有多种应用的排列碳纳米管森林提供了一条新途径。
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Facile growth of high-yield and -crystallinity vertically aligned carbon nanotubes via a sublimated ferric chloride catalyst precursor
A facile and effective catalyst deposition process for carbon nanotube (CNT) array growth via chemical vapor deposition using a resistively heated thermal evaporation technique to sublimate FeCl3 onto the substrate is demonstrated. The catalytic activity of the sublimated FeCl3 catalyst precursor is shown to be comparable to the well-studied e-beam evaporated Fe catalyst, and the resulting vertically aligned CNTs (VA-CNTs) have a similar diameter, walls, and defects, as well as improved bulk electrical conductivity. In contrast to standard e-beam-deposited Fe, which yields base-growth CNTs, scanning and transmission electron microscopy and X-ray photoelectron spectroscopy characterizations reveal a tip-growth mechanism for the FeCl3-derived VA-CNT arrays/forests. The FeCl3-derived forests have a lower (∼1/3 less) longitudinal indentation modulus, but higher longitudinal electrical conductivity (greater than twice) than that of the e-beam Fe-grown CNT arrays. The sublimation process to grow high-quality VA-CNTs is a highly facile and scalable process (extensive substrate shape and size, and moderate vacuum and temperatures) that provides a new route to synthesizing aligned CNT forests for numerous applications.
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来源期刊
Nano Futures
Nano Futures Chemistry-General Chemistry
CiteScore
4.30
自引率
0.00%
发文量
35
期刊介绍: Nano Futures mission is to reflect the diverse and multidisciplinary field of nanoscience and nanotechnology that now brings together researchers from across physics, chemistry, biomedicine, materials science, engineering and industry.
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