Facile synthesis of high density carbon nanotube array by a deposition-growth-densification process

Zhang, Kai; Li, Taotao; Lin, Ling; Lü, Hongfei; Tang, Lei; Li, Chaowei; Wang, Liangjie; Yao, Yagang

doi:10.1016/j.carbon.2016.12.047

Cited by 18 publications

(11 citation statements)

References 31 publications

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“…While these geometrically complex microstructures can be formed by growing and then densifying patterned CNT arrays [8,16] (see figure 1), it is currently challenging to control the densified CNT morphology as a function of h and s, especially without incurring the cost and process hurdles of cleanroom techniques. Spatially selective CNT array [8,14,15,17,26,[27][28][29][30][31][32][33] alongside the linear w versus h scaling relation proposed in [27]. Also shown are previously reported s cr of pins ( ) formed by densifying patterned CNT arrays [18] and s cr of pins reported in this work ( ) alongside the scaling relation proposed in [14], which is shifted upwards for pin formation, as we find s cr ∼ 5 × w for the CNT arrays studied here.…”

Section: Introductionsupporting

confidence: 85%

Morphology control of aligned carbon nanotube pins formed via patterned capillary densification

et al. 2019

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The exceptional intrinsic properties of aligned nanofibers, such as carbon nanotubes (CNTs), and their ability to be easily densified by capillary forces motivates their use as shape-engineerable materials. While a variety of self-assembled CNT structures, such as cell networks, micropillars, and pins have previously been fabricated via the capillary-mediated densification of patterned CNT arrays, predicting the critical pattern size (s cr) that separates cell versus pin formation and the corresponding process-morphology scaling relations within the micrometer range are outstanding. Here, facile and scalable mechanical patterning and capillary densification techniques are used to establish s cr by elucidating how the effective elastic modulus of aligned CNT arrays during densification governs the resulting pin geometries. Experiments and modeling show that this effective modulus scales with CNT height and is about an order of magnitude smaller for pins as compared to cell networks formed from bulk-scale (i.e. non-patterned) CNT arrays. Patterning therefore results in pins with a lower packing density (commensurate with double the wall thickness) and a larger characteristic length scale than bulk cell networks (i.e. s cr ∼ 5 × cell width). CNT arrays with the initial randomly-oriented carbon 'crust' removed via oxygen plasma etching yield a higher degree of structural uniformity and better agreement with the proposed elasto-capillary model, which enables the use of capillary densification to predictively design hierarchical and shapetunable materials for advanced thermal, electronic, and biomedical devices. RECEIVED

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Section: Introductionsupporting

confidence: 85%

Morphology control of aligned carbon nanotube pins formed via patterned capillary densification

et al. 2019

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“…Compared with other methods, CVD method has the advantages of easy-control of reaction process, simple and convenient preparation apparatus, relatively low growth temperature and high purity, low cost, strong adaptability, and large-scale production. The method also has the ability to align carbon nanotubes arrays by controlling the application of catalysts and increase the density of the array by liquid-induced process (Yao et al, 2007;Zhang K. et al, 2017), which has been widely used in the preparation of carbon nanotubes (Prasek et al, 2011;Das et al, 2016).…”

Section: Chemical Vapor Deposition Methodsmentioning

confidence: 99%

Carbon Nanotube Based Fiber Supercapacitor as Wearable Energy Storage

et al. 2019

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Energy storage is a key requirement for the emerging wearable technologies. Recent progress in this direction includes the development of fiber based batteries and capacitors and even some examples of such fibers incorporated into prototype textiles. Herein we discuss the advantages of using the wet-spinning process to create nanostructured carbon based materials as wearable energy storage. The ability to control the physical, mechanical, electrical, and electrochemical properties of carbon nanotube based fibers holds great promise to develop smart polymeric structure as an energy storing materials including fibers and textiles. This is the first comprehensive review to discuss effect of nanostructured energy materials on the electrochemical properties of carbon nanotube based fibers which covers the various compositions, spinning and fabrication conditions on the performance of wearable energy storage.

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“…This originates from the large variability in previously reported CNT cell sizes (see Fig. 1c) and (as will be shown herein) non-representative assumptions of the CNT array elastic response, [32][33][34][35][36][37][38][39] which led to a linear scaling law in ref. 32 that leaves several previous observations unexplained.…”

mentioning

confidence: 89%

Process-morphology scaling relations quantify self-organization in capillary densified nanofiber arrays

Kaiser

Stein

Cui

et al. 2018

Phys. Chem. Chem. Phys.

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Facile synthesis of high density carbon nanotube array by a deposition-growth-densification process

Cited by 18 publications

References 31 publications

Morphology control of aligned carbon nanotube pins formed via patterned capillary densification

Morphology control of aligned carbon nanotube pins formed via patterned capillary densification

Carbon Nanotube Based Fiber Supercapacitor as Wearable Energy Storage

Process-morphology scaling relations quantify self-organization in capillary densified nanofiber arrays

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