Tuning of Fe catalysts for growth of spin-capable carbon nanotubes

Kim, Jae-Hak; Jang, Hee‐Seong; Lee, Kyung H.; Overzet, Lawrence; Lee, Gil S.

doi:10.1016/j.carbon.2009.09.075

Cited by 53 publications

(38 citation statements)

References 26 publications

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“…More importantly, the CNTs grown on films with smaller R s s are more entangled (and less aligned). This effect regarding the Fe film thickness has been reported in previous papers [18], [22] which conclude that the areal density is too low, making the van der Waals forces between adjacent CNTs too weak to align them, which results in a more curly, wavy, and entangled appearance compared to an aligned CNT forest growth [22], [25]. This can be explained simply by the catalytic nanoparticles formation from thin Fe films.…”

Section: A Effect Of the Fe Film Thickness On The Spin-capable Cnt Fmentioning

confidence: 57%

“…1, whereas spin-capable CNT forests grown in He gas can produce CNT sheets longer than 3 m, as reported in [18].…”

Section: B Effect Of the Carrier Gas On The Spin-capable Cnt Forestsmentioning

confidence: 82%

“…Small R s s (thick Fe film) generate very large Fe nanoparticles, which are unsuitable for MWCNTs growth. When the R s is large, (thin Fe films) the areal density decreases [18], [23]. Many of the produced nanoparticles were too large to grow spin-capable MWCNTs in this study.…”

Section: A Effect Of the Fe Film Thickness On The Spin-capable Cnt Fmentioning

confidence: 87%

“…The thickness of the Fe films was controlled over the range of 3-5 nm and was monitored by a quartzcrystal sensor fixed inside the e-beam evaporation chamber. As mentioned in a previous report [18], the as-deposited Fe films had poor within-wafer uniformity and relatively large wafer-towafer variations. After sectioning a wafer into chips (1.0 cm × 1.0 cm), we selected the as-deposited Fe films which had a welldefined R s of to minimize the dependence of Fe film thickness on the growth behavior of MWCNTs.…”

Section: A Materials and The Sample Preparationmentioning

confidence: 90%

“…Previously, our research has shown that the spin capability depends highly on the alignment of the adjacent MWCNTs in a forest made up of MWCNTs possessing a high areal density with short distances between them [18], [19]. This can be achieved by controlling both the suitable Fe nanoparticle size and the areal density, which strongly depends on various elements such as the initial thickness of the Fe catalyst, gas composition, and the pretreatment conditions.…”

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confidence: 97%

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Effect of Carrier Gas on the Growth and Characteristics of Spin-Capable Multiwalled Carbon Nanotubes

Jung

Lee

Overzet

et al. 2014

IEEE Trans. Nanotechnology

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Multiwalled carbon nanotube (MWCNT) sheets that can be spun directly from a spin-capable MWCNT forest promise novel applications that utilize the unique and outstanding characteristics of this material. The growth of spin-capable MWCNT forests will be achieved through the understanding of the important factors affecting the forest growth, since the precise conditions necessary for effective spin-capability are extremely sensitive. In this paper, we discuss the effect of carrier gas, the initial catalyst thickness, and the roles of the hydrogen. These factors were investigated in order to assess and understand these critical parameters and thereby develop a repeatable and reliable spin-capable MWCNT growth process.Index Terms-Carrier gas, catalyst, spin-capable multiwalled carbon nanotube (MWCNT).

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Section: A Effect Of the Fe Film Thickness On The Spin-capable Cnt Fmentioning

confidence: 57%

“…1, whereas spin-capable CNT forests grown in He gas can produce CNT sheets longer than 3 m, as reported in [18].…”

Section: B Effect Of the Carrier Gas On The Spin-capable Cnt Forestsmentioning

confidence: 82%

Section: A Effect Of the Fe Film Thickness On The Spin-capable Cnt Fmentioning

confidence: 87%

Section: A Materials and The Sample Preparationmentioning

confidence: 90%

mentioning

confidence: 97%

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Effect of Carrier Gas on the Growth and Characteristics of Spin-Capable Multiwalled Carbon Nanotubes

Jung

Lee

Overzet

et al. 2014

IEEE Trans. Nanotechnology

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Controllable Preparation and Mechanism Study of Easy‐Peel High‐Density and Vertically Aligned Carbon Nanotube Forests

Wan,

Xu,

Yan

et al. 2024

Physica Status Solidi (a)

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The stripping of carbon nanotube forests (CNTF) is an urgent problem in terms of its application in thermal management and semiconductor devices. The easy‐peel and vertically aligned CNTF is prepared in a two‐step process of high vacuum magnetron sputtering and chemical vapor deposition. Based on the thick alumina buffer layer, CNTF with heights of 100 μm, 300 μm, and 500 μm was prepared by adjusting the magnetron sputtering power. Through SEM observation and calculation, the corresponding densities were 2.5 × 109 cm−2, 6.4 × 109 cm−2, and 1.21 × 1010 cm−2, with an average curvature of 1.64 × 102 m−1, 1.35 × 102 m−1 and 0.53 × 102 m‐−1, respectively. The TEM, XPS, Raman, and TGA were used to investigate the growth mechanism of CNTF. The experimental results show that the catalyst particles annealed under high sputtering power refined with high density can grow a low‐defect, well‐oriented, and high‐density CNTF, and confirm the tip growth route. Further analysis shows that the easy‐peel properties of CNTF depend on the thickness of the alumina layer, the tip growth route, and the tight entanglement between the nanotubes. This paper provides technical guidance and support for the preparation, stripping, and application of monolithic CNTF.

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Dry‐Processable Carbon Nanotubes for Functional Devices and Composites

Wang

Xing

et al. 2014

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Assembly of carbon nanotubes (CNTs) in effective and productive ways is of vital importance to their application. Recent progress in synthesis of CNTs has inspired new strategies for utilizing the unique physiochemical properties of CNTs in macroscale materials and devices. Assembling CNTs by dry processes (e.g., directly collecting CNTs in the form of freestanding films followed by pressing, stretching, and multilayer stacking instead of dispersing them in solution) not only considerably simplifies the processes but also avoids structural damage to the CNTs. Various dry-processable CNTs are reviewed, focusing on their synthesis, properties, and applications. The synthesis techniques are organized in terms of aggregative morphologies and microstructure control of CNTs. Important applications such as functional thin-film devices, strong CNT films, and composites are included. The opportunities and challenges in the synthesis techniques and fabrication of advanced composites and devices are discussed.

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Tuning of Fe catalysts for growth of spin-capable carbon nanotubes

Cited by 53 publications

References 26 publications

Effect of Carrier Gas on the Growth and Characteristics of Spin-Capable Multiwalled Carbon Nanotubes

Effect of Carrier Gas on the Growth and Characteristics of Spin-Capable Multiwalled Carbon Nanotubes

Controllable Preparation and Mechanism Study of Easy‐Peel High‐Density and Vertically Aligned Carbon Nanotube Forests

Dry‐Processable Carbon Nanotubes for Functional Devices and Composites

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