Chemical vapor deposition synthesis of near-zigzag single-walled carbon nanotubes with stable tube-catalyst interface

Zhao, Qiuchen; Xu, Ziwei; Hu, Yue; Ding, Feng; Zhang, Jin

doi:10.1126/sciadv.1501729

Cited by 67 publications

(65 citation statements)

References 41 publications

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“…The long switching lengths ( > 4 nm ) for large SWCNT series make reconfiguration from armchair to zigzag during growth unlikely for large diameter SWCNTs. However, due to the short switching length of small SWCNT series it might be possible to stimulate a transition from armchair to zigzag during the early stages of growth [28].…”

Section: Resultsmentioning

confidence: 99%

Analytical modelling of single-walled carbon nanotube energies: the impact of curvature, length and temperature

Hedman

Larsson

2020

SN Appl. Sci.

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Recent breakthroughs in the field of single-walled carbon nanotube (SWCNT) growth have been achieved by combining theoretical models with experiments. Theoretical models rely on accurate energies for SWCNTs, obtained via first principle calculations in the form of density functional theory (DFT). Such calculations are accurate, but time and resource intensive which limits the size and number of systems that can be studied. Here, we present a new analytical model consisting of three fundamental energy expressions, parametrized using DFT, for fast and accurate calculation of SWCNT energies at any temperature. Tests against previously published results show our model having excellent accuracy, with an root mean square error in total energies below 2 meV per atom as compared to DFT. We apply the model to study SWCNT growth on Ni catalysts at elevated temperatures by investigating the SWCNT/catalyst interface energy. Results show that the most stable interface shifts towards chiral edges as the temperature increases. The model's ability to perform calculations at any temperature in combination with its speed and flexibility will allow researcher to study more and larger systems, aiding future research into SWCNT growth.

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Section: Resultsmentioning

confidence: 99%

Analytical modelling of single-walled carbon nanotube energies: the impact of curvature, length and temperature

Hedman

Larsson

2020

SN Appl. Sci.

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“…we show that the chiralities of the nanotubes do not play a significant role, which bodes well for large-scale device synthesis, since controlling nanotube chiralities during CVD growth is still challenging 12 .…”

mentioning

confidence: 71%

“…This insensitivity to tube chirality is highly beneficial, since it is extremely difficult to control tube chiralities during CVD growth process 12 .…”

mentioning

confidence: 99%

Spin filtering with poly-T wrapped single wall carbon nanotubes

Alam

Pramanik

2017

Nanoscale

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Spin filtering is an essential operation in spintronics that allows creation and detection of spin polarized carriers. Transition metal ferromagnets are used as spin filters in most cases, though their spin filtering efficiency is only around ~50%, thereby limiting the efficiency of spintronic devices. Recently, chiral systems such as DNA have been shown to exhibit efficient spin filtering, a phenomenon often dubbed as "chirality induced spin selectivity" (CISS). In this work, we consider single wall carbon nanotubes helically wrapped with single stranded poly-T DNA. By magnetoresistance measurements we show that this system exhibits significant spin polarization of ~80%, which could be attributed to the Rashba spin-orbit interaction induced by the inversion asymmetric helical potential of the DNA. Observed spin polarization is larger than that reported before for d(GT) 15 strands. Such systems allow tailoring spin polarization by chemical means and also allow extremely localized creation and detection of spin polarization without any magnetic element and could lead to extreme miniaturization and compact integration of spintronic devices and circuits.

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“…[23,24] Therefore, under certain CVD conditions, the catalyst structure, which is related to the composition and carbon solubility of the nanoparticle, [24][25][26][27] could determine the chirality distribution of the SWCNT product. As revealed by in situ environmental TEM, in the reduced PtFe catalyst, it is the Hägg carbide instead of PtFe alloy that catalyzes the nucleation of carbon nanotubes.…”

Section: Characterizations Of Swcnts Grown By Cvdmentioning

confidence: 99%

Environmental transmission electron microscopy investigations of Pt-Fe2O3 nanoparticles for nucleating carbon nanotubes

Zhang

Jiang

et al. 2016

Carbon

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Chemical vapor deposition synthesis of near-zigzag single-walled carbon nanotubes with stable tube-catalyst interface

Abstract: Enriching near-zigzag single-walled carbons, which have a small tube-catalyst interface, by a “tandem plate” CVD method.

Cited by 67 publications

References 41 publications

Analytical modelling of single-walled carbon nanotube energies: the impact of curvature, length and temperature

Analytical modelling of single-walled carbon nanotube energies: the impact of curvature, length and temperature

Spin filtering with poly-T wrapped single wall carbon nanotubes

Environmental transmission electron microscopy investigations of Pt-Fe2O3 nanoparticles for nucleating carbon nanotubes

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