Sliding nanomechanical resonators

Ying, Yue; Zhang, Zhuo‐Zhi; Moser, J.; Su, Zi-Jia; Song, Xiang‐Xiang; Guo, Guo-Ping

doi:10.1038/s41467-022-34144-5

Cited by 13 publications

(3 citation statements)

References 47 publications

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“…Our findings outline the working principle of vertical strain engineering in 2D devices and offer the essential data that can be used in the design. The concept can be integrated with the recent interest in moving interfaces or contacts [41,42] to introduce mechanical controls beyond the conventional approach of material selection in device design.…”

Section: Discussionmentioning

confidence: 99%

Vertical strain engineering of Van der Waals heterostructures

Bian

2023

Nanotechnology

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Van der Waals materials and their interfaces play critical roles in defining electrical contacts for nanoelectronics and developing vehicles for mechanoelectrical energy conversion. In this work, we propose a vertical strain engineering approach by enforcing pressure across the heterostructures. First-principles calculations show that the in-plane band structures of 2D materials such as graphene, h-BN, and MoS2 as well as the electronic coupling at their contacts can be significantly modified. For the graphene/h-BN contact, a band gap in graphene is opened, while at the graphene/MoS2 interface, the band gap of MoS2 and the Schottky barrier height at contact diminish. Changes and transitions in the nature of contacts are attributed to localized orbital coupling and analyzed through the redistribution of charge densities, the crystal orbital Hamilton population, and electron localization, which yield consistent measures. These findings offer key insights into the understanding of interfacial interaction between 2D materials as well as the efficiency of electronic transport and energy conversionprocesses.

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Section: Discussionmentioning

confidence: 99%

Vertical strain engineering of Van der Waals heterostructures

Bian

2023

Nanotechnology

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“…Occasionally, this form of fixation is unreliable, leading to a film slipping on the substrates during vibrations. 42 In such instances, the boundary conditions for fixation cease to be applicable. However, the contribution of the slipping boundaries to the vibration coupling between neighboring devices 43 methods (FEM), the study numerically simulated this phenomenon, where the interaction between the middle connection part and the substrate was due to van der Waals forces, deviating from the conventional belief of complete immobilization.…”

Section: ■ Introductionmentioning

confidence: 99%

Vibration Transfer in Spatially Separated Thin-Film Graphene Resonators

Liu,

Hu,

Wang

et al. 2024

ACS Appl. Nano Mater.

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The nanomechanical resonator composed of two-dimensional materials has seen extensive investigations, but the interaction between two adjacent resonators has not called much attention. The paper reports a vibration transfer phenomenon within a graphene film covering two neighboring holes. When an electrostatic excitation was applied to one of the resonators, vibration signals were detected in both resonators but with a 90° phase difference, as measured by a microscopic laser vibrometer. The findings were validated through finite element simulations and molecular dynamics simulations. It is concluded that the occurrence of this vibration transfer phenomenon is attributed to the slip displacement of graphene film within the middle connection region. The vibration transfer phenomenon sheds light on issues such as resonator excitation, signal transfer, and modal coupling. Moreover, two orthogonal signals with a 90° phase difference hold significant value for applications across various fields, including digital communication systems.

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“…These materials share a common feature: the weak vdW interactions between layers, contrasting with the strong covalent bonds within each layer . Especially at incommensurate interfaces, such weak vdW interactions even allow for the interlayer sliding degree of freedom. , One intriguing mechanical behavior that arises from incommensurate vdW interfaces is structural superlubricity (SSL), − characterized by nearly zero friction and zero wear between two contacting solid surfaces, which has offered revolutionary solutions to friction and wear challenges in nano- and micromechanical systems. , Additionally, the interlayer sliding ability of 2D vdW layered materials presents exciting possibilities for device design, − exemplified by the realization of highly stretchable and malleable vdW thin films composed of 2D nanosheets with staggered arrangements …”

Section: Introductionmentioning

confidence: 99%

Filtering Robust Graphite without Incommensurate Interfaces by Electrical Technique

Chen,

Wu,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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van der Waals (vdW) layered materials have attracted considerable attention due to their potential applications in various fields. Among these materials, graphite is widely employed to achieve structural superlubricity (SSL), where the interfacial friction between two solids is almost negligible and the wear is zero. However, the development of integrated SSL systems using graphite flakes still faces a major obstacle stemming from the inherent delamination-induced instability in vdW layered materials. To address this issue, we propose a nondestructive filtering technique that utilizes electrical measurement to identify robust graphite flakes without delamination. Our experimental results confirm that all the filtered graphite flakes exhibit delamination-free behavior after more than 7000 cycles of sliding on a series of 2D and 3D substrates. Besides, we employ three types of characterizing methods to confirm that the filtering process does not impair the graphite flakes. Moreover, with focused ion beam (FIB) assisted slicing characterization and statistical analysis, we have discovered that all of the filtered flakes possess a graphite layer thickness below 100 nm. This is consistent with the thickness of the single crystalline graphite layer of our samples reported in the literature, suggesting the absence of incommensurate interfaces in the filtered graphite flakes. Our work contributes to a deeper understanding of the relationship between graphite conductance and incommensurate interfaces. In addition, we present a possible solution to address the delamination problem in layered materials, and this technique shows the potential to characterize the internal microstructure of grains and the distribution of grain boundaries in vdW materials on a large scale.

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Sliding nanomechanical resonators

Cited by 13 publications

References 47 publications

Vertical strain engineering of Van der Waals heterostructures

Vertical strain engineering of Van der Waals heterostructures

Vibration Transfer in Spatially Separated Thin-Film Graphene Resonators

Filtering Robust Graphite without Incommensurate Interfaces by Electrical Technique

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