Directly correlating the strain-induced electronic property change to the chirality of individual single-walled and few-walled carbon nanotubes

Ning, Zhiyuan; Chen, Qing; Wei, Fei; Ye, Linhui; Wei, Xianlong; Fu, Mengqi; Bai, Xuedong

doi:10.1039/c5nr02947c

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…We assume that it is the strain from the curved structure that results in anomaly of electrical characteristics. When the CNTs are curled, it will cause extra resistance to broaden the bandgap so as to decrease the conductivity of CNTs . At the off state, the conduction and valence bands will be synchronously adjusted because electrons and holes are equally affected.…”

Section: Resultsmentioning

confidence: 99%

“…When the CNTs are curled, it will cause extra resistance to broaden the bandgap so as to decrease the conductivity of CNTs. 30 At the off state, the conduction and valence bands will be synchronously adjusted because electrons and holes are equally affected. On the on-state, despite similar resistance induced by strain, the inner walls of DWNTs will also contribute to the output delivery.…”

Section: Resultsmentioning

confidence: 99%

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Monochromatic Carbon Nanotube Tangles Grown by Microfluidic Switching between Chaos and Fractals

et al. 2021

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The nature of chaos is in that elusive flow that is an advanced order out of our vision. It is wise to take advantage of chaos after recognizing or modifying its unique fractal properties. Here, a magnetron weaving strategy was developed for producing chaotic but monochromatic carbon nanotube tangles (CNT-Ts) under Kelvin−Helmholtz instability (KHI). The self-similarity characteristic facilitated individual ultralong CNTs to manipulate their entropy-driven fractal geometry, resulting in ∼10 4 μm 2 CNT-Ts with variable curvature radius. In addition, based on the rate-selected mechanism, 85% metallic and ∼100% semiconducting CNT-Ts were synthesized and separated simultaneously at different length positions. After ex situ modifying their fractal into aligned CNTs with hydrogel, these CNT-Ts delivered a current of 10 μA μm −1 in transistors with an on/off ratio >10 7 . It has provided the third route as a paradigm of applying one-dimensional nanomaterials by switching between chaos and fractal, in parallel with that of direct synthesis and postseparation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Monochromatic Carbon Nanotube Tangles Grown by Microfluidic Switching between Chaos and Fractals

et al. 2021

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“…Both experimental and theoretical studies have demonstrated that the deformation of a CNT will lead to a signifi cant increase in its resistance. [44][45][46][47] Therefore, we believe that the increases of the composite resistances under pressures derive from the large curvatures of the inside MWNTs. Rochefort et al [ 44 ] found that the atomic structure of the CNTs change from sp 2 to sp 3 under large bending.…”

Section: Resultsmentioning

confidence: 98%

Deformation Effect on the Electrical Properties of a Flexible Organic Semiconductor composed of Poly(dimethylsiloxane) and Multiwalled Carbon Nanotubes

Zhou

Zhang

Liu

et al. 2016

Adv Elect Materials

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advances in organic semiconductors have fueled many of the developments in the fi eld of fl exible electronics. [9][10][11][12] In comparison with the conventional organic semiconductors, blending organic polymers with low dimension conductive materials seems able to offer the great possibility to construct the devices with high conductivity and controllability. [13][14][15][16] Poly(dimethylsiloxane) (PDMS), a typical example of insulating organic polymers, has always been a very popular material for the fabrication of fl exible electronic devices for its numerous advantages including high elasticity, good stability, and biocompatibility. However, in most cases, PDMS is usually taken on as substrates of fl exible devices. [17][18][19][20] Composites merging together the excellent properties of low dimension conductive materials and PDMS with the high tunability have a rich prospect in different research fi elds, yet the reports are much fewer. [21][22][23][24] Currently, lots of efforts have been made in research of low dimension conductive fi llers, such as carbon nanotubes (CNTs) and graphene, for their unique properties and potential applications. [25][26][27][28] CNTs, which are hollow, cylindrical nanometer-sized fi bers with high aspect ratio, charge carrier mobility, and fl exibility, are promising candidates for fl exible electronics. [29][30][31][32] In our previous work, we presented a fl exible polymer semiconductor composed of PDMS and multiwalled carbon nanotubes (MWNTs), and researched the contacts in the metal/composite junctions for the fi rst time. The Coulomb gap variable range hopping (CG VRH) model could satisfactorily explain the semiconductor behavior in the composites, and Schottky diodes prepared by curing the 0.35 wt% composite between gold (Au) and copper (Cu) electrodes showed a typical P-type rectifi ed behavior with a high Schottky barrier height (SBH) of 0.78 eV. Field effect transistors with a high effective mobility of 1.98 cm 2 V −1 s −1 and photovoltaic devices with a stable open-circuit voltage of 0.4 V have been fabricated by taking advantage of the semiconductor property of the 0.35 wt% composite. These results suggest that the MWNT-PDMS composites can be treated as usual P-type semiconductors and can Organic semiconductors are the main elements for the development of fl exible electronics due to their excellent fl exibility and large-area manufacturing at low cost. Here, the effect of deformation on the electrical properties of a highly fl exible organic semiconductor composed of poly(dimethylsiloxane) and multiwalled carbon nanotubes is investigated. The results reveal that their resistances increase with increasing deformation quantities, and in contrast to the outcomes of the compressed samples, the resistances of the higher multiwalled carbon nanotube loading composites show greater changes than those of the lower ones under certain bending angles or stretching ratios. Moreover, the property of the 0.35 wt% (the percolation threshold of the composite) sample is highly st...

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Horizontally aligned carbon nanotube arrays: growth mechanism, controlled synthesis, characterization, properties and applications

2017

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Carbon nanotubes (CNTs) have attracted worldwide research interest in the past two decades owing to their extraordinary properties and wide applications in numerous fields. Among various types of CNTs, the horizontally aligned CNT (HACNT) arrays, which consist of CNTs grown on flat substrates and parallel with each other with large intertube distances and lengths up to centimeters, show many advantages due to their perfect structures and extraordinary mechanical, thermal and electrical properties. HACNTs show great potential as building blocks for transparent displays, nano electronics, quantum lines, field emission transistors, superstrong tethers, aeronautics and astronics materials, and even space elevators. During the past years, great progress has been achieved in HACNT research. In this review, we systematically review the growth mechanism, structure control, morphology control, characterization, manipulation, properties, and applications of HACNTs. Finally, we present a summary and outlook for the future development of HACNTs. We hope these advances will shed light on the future study of HACNTs.

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Directly correlating the strain-induced electronic property change to the chirality of individual single-walled and few-walled carbon nanotubes

Cited by 4 publications

References 37 publications

Monochromatic Carbon Nanotube Tangles Grown by Microfluidic Switching between Chaos and Fractals

Monochromatic Carbon Nanotube Tangles Grown by Microfluidic Switching between Chaos and Fractals

Deformation Effect on the Electrical Properties of a Flexible Organic Semiconductor composed of Poly(dimethylsiloxane) and Multiwalled Carbon Nanotubes

Horizontally aligned carbon nanotube arrays: growth mechanism, controlled synthesis, characterization, properties and applications

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