Covalent Atomic Bridges Enable Unidirectional Enhancement of Electronic Transport in Aligned Carbon Nanotubes

Chen, Mingguang; Li, Wangxiang; Kumar, Anshuman; Li, Guanghui; Itkis, Mikhail E.; Wong, Bryan M.; Bekyarova, Elena

doi:10.1021/acsami.9b01400

Cited by 31 publications

(15 citation statements)

References 56 publications

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“…[3][4][5] The CVF method has been subsequently used by other groups to obtain similar aligned CNT films. [6][7][8][9][10][11][12] However, the mechanism that produces such global spontaneous alignment during vacuum filtration is not fully understood. In particular, what determines the direction of CNT alignment has been a matter of controversy.…”

Section: Main Textmentioning

confidence: 99%

Groove-Assisted Global Spontaneous Alignment of Carbon Nanotubes in Vacuum Filtration

et al. 2020

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Ever since the discovery of carbon nanotubes (CNTs), it has long been a challenging goal to create macroscopically ordered assemblies, or crystals, of CNTs that preserve the one-dimensional quantum properties of individual CNTs on a macroscopic scale.Recently, a simple and well-controlled method was reported for producing wafer-scale crystalline films of highly aligned and densely packed CNTs through spontaneous global alignment that occurs during vacuum filtration [Nat. Nanotechnol. 11, 633 (2016)].However, a full understanding of the mechanism of such global alignment has not been achieved. Here, we report results of a series of systematic experiments that demonstrate that the CNT alignment direction can be controlled by the surface morphology of the filter membrane used in the vacuum filtration process. More specifically, we found that the direction of parallel grooves pre-existing on the surface of the filter membrane dictates the direction of the resulting CNT alignment. Furthermore, we intentionally imprinted periodically spaced parallel grooves on a filter membranes using a diffraction grating, which successfully defined the direction of the global alignment of CNTs in a precise and reproducible manner.

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Section: Main Textmentioning

confidence: 99%

Groove-Assisted Global Spontaneous Alignment of Carbon Nanotubes in Vacuum Filtration

et al. 2020

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“…Looking forward, we anticipate that the HADOKEN software package could be used in a variety of other applications that require electronic structure calculations of these unique structures. For example, since our calculations demonstrate that electron gases at nanoscale core-shell interfaces differ significantly from their bulk counterparts, we anticipate that other observables such as electron transport [48] or optical properties [49] in these systems would also exhibit unique behavior. As such, the wavefunctions and total electron densities computed by the HADOKEN code can serve as a starting point to initialize the computation of these dynamical properties.…”

Section: Discussionmentioning

confidence: 94%

HADOKEN: An open-source software package for predicting electron confinement effects in various nanowire geometries and configurations

2022

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We present an open-source software package, HADOKEN (High-level Algorithms to Design, Optimize, and Keep Electrons in Nanowires), for predicting electron confinement/localization effects in nanowires with various geometries, arbitrary number of concentric shell layers, doping densities, and external boundary conditions. The HADOKEN code is written in the MATLAB programming environments to aid in its readability and general accessibility to both users and practitioners. We provide several examples and outputs on a variety of different nanowire geometries, boundary conditions, and doping densities to demonstrate the capabilities of the HADOKEN software package. As such, the use of this predictive and versatile tool by both experimentalists and theorists could lead to further advances in both understanding and tailoring electron confinement effects in these nanosystems.

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“…Another group has reported using a combination of NMP vapor and heated NMP which may produce an equally robust transfer method. 59 However, when we tried a process involving a similar combination of chloroform vapor and room temperature chloroform, we found the process to be unreliable.…”

Section: Transfer Of Swcnt Films To a Substratementioning

confidence: 99%

Global Alignment of Solution-Based Single-Wall Carbon Nanotube Films via Machine-Vision Controlled Filtration

et al. 2019

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Over the past decade, substantial progress has been made in the chemical processing (chiral enrichment, length sorting, handedness selectivity, and filling substance) of single-wall carbon nanotubes (SWCNTs). Recently, it was shown that large, horizontally-aligned films can be created out of post-processed SWCNT solutions. Here, we use machine-vision automation and parallelization to simultaneously produce globally-aligned SWCNT films using pressure-driven filtration. Feedback control enables filtration to occur with a constant flow rate that not only improves the nematic ordering of the SWCNT films, but also provides the ability to align a wide range of SWCNT types and on a variety of nanoporous membranes using the same filtration parameters. Using polarized optical spectroscopic techniques, we show that meniscus combing produces a two-dimensional radial SWCNT alignment on one side of the film. After we flatten the meniscus through silanation, spatially-resolved nematicity maps on both sides of the SWCNT film reveal global alignment across the entire structure. From experiments changing ionic strength and membrane tribocharging, we provide evidence that the SWCNT alignment mechanism stems from an interplay of intertube interactions and ordered membrane charging. This work opens up the possibility of creating globally-aligned SWCNT film structures for a new-generation of nanotube electronics and optical control elements. KeywordsNematic ordering, 1D crystals, single-wall carbon nanotubes Significant interest in one-dimensional (1D) nanocrystals (NCs) follows from their highly anisotropic properties of electrical and thermal transport, optical absorption, radiative emis-sion, and conduction. Typically, physical attributes observed in these NCs are significantly enhanced along the extended 1D crystal axis relative to the short axes, the latter often 1 arXiv:1907.09499v1 [cond-mat.mes-hall]

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Covalent Atomic Bridges Enable Unidirectional Enhancement of Electronic Transport in Aligned Carbon Nanotubes

Cited by 31 publications

References 56 publications

Groove-Assisted Global Spontaneous Alignment of Carbon Nanotubes in Vacuum Filtration

Groove-Assisted Global Spontaneous Alignment of Carbon Nanotubes in Vacuum Filtration

HADOKEN: An open-source software package for predicting electron confinement effects in various nanowire geometries and configurations

Global Alignment of Solution-Based Single-Wall Carbon Nanotube Films via Machine-Vision Controlled Filtration

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