Revisiting Frictional Characteristics of Graphene: Effect of In-Plane Straining

Xu, Chaochen; Zhang, Shuai; Du, Hongzhi; Xue, Tao; Kang, Yilan; Yang, Zhiwei; Zhao, Pei; Li, Qunyang

doi:10.1021/acsami.2c10449

Cited by 18 publications

(9 citation statements)

References 44 publications

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“…The phase variation is illustrated in Fig. 2a, where a lower phase value indicates a lower contact stiffness and thus weaker interface strength between the graphene and substrate [27][28][29] . Figure 2b-e shows phase images acquired on several regions of different samples, having varying graphene thickness above the substrate.…”

Section: Characterization Of the Interfacial Interaction Between Grap...mentioning

confidence: 99%

Friction hysteretic behavior of supported atomically thin nanofilms

Egberts

2023

npj 2D Mater Appl

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Hysteretic friction behavior has been observed on varied 2D nanofilms. However, no unanimous conclusion has yet been drawn on to the exact mechanism or relative contribution of each mechanism to the observed behavior. Here we report on hysteretic friction behavior of supported atomically thin nanofilms studied using atomic force microscopy (AFM) experiments and molecular dynamics (MD) simulations. Load dependent friction measurements were conducted on unheated and heated samples of graphene, h-BN, and MoS2 supported by silica substrates. Two diverging friction trends are reported: the unheated samples showed higher friction during unloading than during loading, and the heated samples showed a reversed hysteresis. Further, the friction force increased sub-linearly with normal force for heated samples, compared with unheated samples. Tapping mode AFM suggested that the interaction strength of the substrate was increased with heating. Roughened substrates in the MD simulations that mimicked strong/weak interaction forces reproduced the experimental observations and revealed that the evolution of real contact area in different interface interaction situation caused the diverging behaviors. Surface roughness and interaction strength were found to be the key parameters for controlling the out-of-plane deformation of atomically thin nanofilms.

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Section: Characterization Of the Interfacial Interaction Between Grap...mentioning

confidence: 99%

Friction hysteretic behavior of supported atomically thin nanofilms

Egberts

2023

npj 2D Mater Appl

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“…It is well-known that the phase signal obtained by the AFM tapping mode represents changes in the energy dissipation of the oscillating cantilever as it scans over the surface, , that can be used provide a map of effective stiffness, , i.e., the zinc deposition. Typically, a material with lower stiffness tends to exhibit a smaller phase value. , Figure shows the phase signal over the zinc deposited on a perforated copper foil using FB and FBT modes. The FBT mode shows a higher stiffness as indicated by its higher average phase angle of 58.23°, compared to the FB mode with an average phase angle of 51.07°.…”

Section: Resultsmentioning

confidence: 99%

“…Typically, a material with lower stiffness tends to exhibit a smaller phase value. 76,77 Figure 6 shows the phase signal over the zinc deposited on a perforated copper foil using FB and FBT modes. The FBT mode shows a higher stiffness as indicated by its higher average phase angle of 58.23°, compared to the FB mode with an average phase angle of 51.07°.…”

Section: Afm Analysis Afm Analysis Is Applied As a Valuable Technique...mentioning

confidence: 99%

Electrode Materials for Enhancing the Performance and Cycling Stability of Zinc Iodide Flow Batteries at High Current Densities

ShakeriHosseinabad

Frost

Said

et al. 2023

ACS Appl. Mater. Interfaces

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Aqueous redox flow battery systems that use a zinc negative electrode have a relatively high energy density. However, high current densities can lead to zinc dendrite growth and electrode polarization, which limit the battery's high power density and cyclability. In this study, a perforated copper foil with a high electrical conductivity was used on the negative side, combined with an electrocatalyst on the positive electrode in a zinc iodide flow battery. A significant improvement in the energy efficiency (ca. 10% vs using graphite felt on both sides) and cycling stability at a high current density of 40 mA cm −2 was observed. A long cycling stability with a high areal capacity of 222 mA h cm −2 is obtained in this study, which is the highest reported areal capacity for zinc−iodide aqueous flow batteries operating at high current density, in comparison to previous studies. Additionally, the use of a perforated copper foil anode in combination with a novel flow mode was discovered to achieve consistent cycling at exceedingly high current densities of >100 mA cm −2 . In situ and ex situ characterization techniques, including in situ atomic force microscopy coupled with in situ optical microscopy and X-ray diffraction, are applied to clarify the relationship between zinc deposition morphology on the perforated copper foil and battery performance in two different flow field conditions. With a portion of the flow going through the perforations, a significantly more uniform and compact zinc deposition was observed compared to the case where all of the flow passed over the surface of the electrode. Results from modeling and simulation support the conclusion that the flow of a fraction of electrolyte through the electrode enhances mass transport, enabling a more compact deposit.

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“…By depositing graphene onto a stretchable substrate, the frictional characteristics of supported graphene under a wide range of strain are examined with an in situ tensile loading platform [286]. Analogous to the suspended system, the friction of supported graphene tends to decrease with increasing strain, yet shows two distinct stages with considerably different strain dependences (figure 12(b)).…”

Section: Strain Effectmentioning

confidence: 99%

Recent advances in the mechanics of 2D materials

Wang

Hou

Yan

et al. 2023

Int. J. Extrem. Manuf.

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The exceptional physical properties and unique layered structure of two-dimensional (2D) materials has made this class of materials great s candidate for applications in electronics, energy conversion/storage devices, nanocomposites, and multifunctional coatings, among others. At the center of this application-space, mechanical properties play a vital role in materials design, manufacturing, integration and performance. The emergence of 2D materials has also sparked broad scientific inquiry, with new understanding of mechanical interactions between 2D structures and interfaces being of great interest to the community. Building on the dramatic expansion of research activity in recent years, here we provide a review of recent advances in the understanding of the elastic properties, in-plane failures, fatigue performance, interfacial shear/friction, and adhesion behavior of 2D materials. In this article, special emphasis is placed on some new 2D materials, novel characterization techniques and computational methods, as well as insights into deformation and failure mechanisms. A deep understanding of the intrinsic and extrinsic factors that govern 2D material mechanics is further provided, in the hopes that the community may draw design strategies for structural and interfacial engineering of 2D material systems. We end this review article with a discussion of our perspective on the state of the field and outlook on areas for future research directions.

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Revisiting Frictional Characteristics of Graphene: Effect of In-Plane Straining

Cited by 18 publications

References 44 publications

Friction hysteretic behavior of supported atomically thin nanofilms

Friction hysteretic behavior of supported atomically thin nanofilms

Electrode Materials for Enhancing the Performance and Cycling Stability of Zinc Iodide Flow Batteries at High Current Densities

Recent advances in the mechanics of 2D materials

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