One-dimensional van der Waals heterostructures

Xiang, Rong; Inoue, Taiki; Zheng, Yongjia; Kumamoto, Akihito; Yang, Qian; Sato, Yuta; Liu, Ming; Gokhale, Devashish; Guo, Jia; Hisama, Kaoru; Yotsumoto, Satoshi; Ogamoto, Tatsuro; Arai, Hiromichi; Kobayashi, Yu; Zhang, Hao; Hou, Bo; Anisimov, Anton S.; Miyata, Yasumitsu; Okada, Susumu; Chiashi, Shohei; Li, Yan; Kong, Jing; Kauppinen, Esko I.; Ikuhara, Yuichi; Suenaga, Kazu; Maruyama, Shigeo

doi:10.1126/science.aaz2570

Cited by 257 publications

(301 citation statements)

References 57 publications

(60 reference statements)

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“…The temperature characteristic curves of each gas-sensing material to 15 μL/L C 2 H 2 are given in Figure 8 . Because MoS 2 is a narrow-band-gap semiconductor gas-sensing material with low excitation energy, the temperature range is set at 50~150 °C [ 32 , 33 , 34 ]. It can be seen that the change trend of the gas-sensing response increases first and then decreases accompanied by a rise in working temperature.…”

Section: Resultsmentioning

confidence: 99%

Low Working Temperature of ZnO-MoS2 Nanocomposites for Delaying Aging with Good Acetylene Gas-Sensing Properties

Wang

Chen

et al. 2020

Nanomaterials

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The long-term stability and the extension of the use time of gas sensors are one of the current concerns. Lowering the working temperature is one of the most effective methods to delay aging. In this paper, pure MoS2 and ZnO-MoS2 nanocomposites were successfully prepared by the hydrothermal method, and the morphological characteristics were featured by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Pure MoS2 and ZnO-MoS2 nanocomposites, as a comparison, were used to study the aging characteristic. The sensing properties of the fabricated gas sensors with an optimal molar ratio ZnO-MoS2 (Zn:Mo = 1:2) were recorded, and the results exhibit a high gas-sensing response and good repeatability to the acetylene detection. The working temperature was significantly lower than for pure MoS2. After aging for 40 days, all the gas-sensing response was relatively attenuated, and pure MoS2 exhibits a faster decay rate and lower gas-sensing response than nanocomposites. The better gas-sensing characteristic of nanocomposites after aging was possibly attributed to the active interaction between ZnO and MoS2.

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Section: Resultsmentioning

confidence: 99%

Low Working Temperature of ZnO-MoS2 Nanocomposites for Delaying Aging with Good Acetylene Gas-Sensing Properties

Wang

Chen

et al. 2020

Nanomaterials

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“…Earlier this year, we demonstrated the chemical vapor deposition (CVD) synthesis of SWCNT–BNNT and SWCNT–MoS 2 NT heterostructures. [ 10 ] A ternary SWCNT–BNNT–MoS 2 NT with the diameter of 5 nm was also fabricated by two sequential CVDs ( Figure ). In these structures, different nanotubes are coaxially nested and all shells are single crystals, as demonstrated by transmission electron microscope (TEM), scanning TEM (STEM), electron energy loss spectroscopy (EELS), and electron diffraction characterizations.…”

Section: Brief Historymentioning

confidence: 99%

Heteronanotubes: Challenges and Opportunities

Xiang

Maruyama

2021

Small Science

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The experimental synthesis of 1D van der Waals heterostructures, a class of materials in which different crystallized nanotubes are coaxially nested, was recently demonstrated. In this perspective, the current challenges in the chemical vapor deposition synthesis of this new structure are outlined, and the visions on its potential applications are presented. A particular emphasis is given to electronic devices that are built after modulating different shell–shell combinations in these heteronanotubes.

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“…The interactions among C, B and N atoms were described by the Tersoff potential, 25,26 while the interaction between Mo and S atoms in MSNTs was described by the REBO potential, since the previous study 27 suggested that the REBO potential 28,29 can give a more accurate prediction of thermal transport properties compared to the Stillinger-Weber potential. 30,31 The weak vdW interactions between adjacent nanotubes are modelled by Lennard-Jones (LJ) potential with the form V(rij) = 4[(/rij) 12 -(/rij) 6 ], where  , and rij, respectively, are depth of the potential well, finite distance at which the inter-particle potential is zero, and the distance between atoms i and j.…”

Section: Molecular Dynamics Simulations the Molecular Dynamics Simulmentioning

confidence: 99%

Thermal Transport in One-Dimensional Van Der Waals Heterostructures: Effects of Coating Layers on the Thermal Conductivity of Carbon Nanotubes

Ying

Zhang²,

Du³

et al. 2020

Preprint

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In this paper, we conduct a comprehensive investigation on the thermal transport in one-dimensional (1D) van der Waals (vdW) heterostructures by using non-equilibrium molecular dynamics simulations. It is found that the boron nitride nanotube (BNNT) coating can increase the thermal conductance of inner carbon nanotube (CNT) base by 36%, while the molybdenum disulfide nanotube (<a>MSNT</a>) coating can reduce the thermal conductance by 47%. The different effects of BNNT and MSNT coatings on the thermal transport behaviors of 1D vdW heterostructures are explained by the competition mechanism between improved heat flux and increased temperature gradient in 1D vdW heterostructures. By taking CNT@BNNT@MSNT as an example, thermal transport in 1D vdW heterostructures containing three layers is also investigated. It is found that the coaxial BNNT-MSNT coating can significantly reduce the thermal conductance of inner CNT base by 61%, which is even larger than that of an individual MSNT coating. This unexpected reduction in thermal conductance of CNT@BNNT@MSNT can be explained by the suppression of heat flux arising from the possible compression effect, since BNNT-MSNT coating in CNT@BNNT@MSNT can more significantly suppress the vibration of inner CNT when compared to the individual MSNT coating in CNT@MSNT. In addition to the in-plane thermal transport, the interfacial thermal conductance between inner and outer nanotubes in 1D vdW heterostructures is also examined to provide a quantitative understanding of the thermal transport behaviors of1D vdW heterostructures. This work is expected to provide molecular insights into tailoring the heat transport in carbon base 1D vdW heterostructures and thus facilitate their broader applications as thermal interface materials.

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One-dimensional van der Waals heterostructures

Cited by 257 publications

References 57 publications

Low Working Temperature of ZnO-MoS2 Nanocomposites for Delaying Aging with Good Acetylene Gas-Sensing Properties

Low Working Temperature of ZnO-MoS2 Nanocomposites for Delaying Aging with Good Acetylene Gas-Sensing Properties

Heteronanotubes: Challenges and Opportunities

Thermal Transport in One-Dimensional Van Der Waals Heterostructures: Effects of Coating Layers on the Thermal Conductivity of Carbon Nanotubes

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