On the lubrication of rough copper surfaces with graphene

Bian, Jianjun; Nicola, Lucia

doi:10.1016/j.triboint.2020.106837

Cited by 15 publications

(5 citation statements)

References 52 publications

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“…As shown in Figure S8b,c (Supporting Information), the GO exhibits wrinkled layered structure, which can effectively improve the lubrication effect between friction interface. [34][35][36] The copper-based monolayer graphene film was attached to the acrylic substrate, and we designed a tank to hold water-based GO solution to avoid its evaporation. The tank was fixed on P-type Si, and 2500 µL water-based GO solution was injected into the tank to test the stability of GWS-TVNG with P-type Si (Figure 4c).…”

Section: Lifetime Of Gws-tvngmentioning

confidence: 99%

“…[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] However, the solidsolid hard contact of TVNG will cause the interlocking between atoms on the contact interface, resulting in the increase of friction stress and aggravation of wear problem. [28] The severe wear problem will cause rapid attenuation of output performance, thus, it is difficult for TVNG to realize long-term operation with high current density. Meanwhile, the wear problem will also increase the device replacement costs and affect the sensitivity of TVNGbased self-powered system.…”

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confidence: 99%

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Simultaneously Enhancing Direct‐Current Density and Lifetime of Tribovotaic Nanogenerator via Interface Lubrication

Qiao

Zhao

Zhou

et al. 2022

Adv Funct Materials

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Tribovoltaic nanogenerators (TVNGs) present great properties such as high direct‐current density and continuous output performance, which has great potential to solve the power supply problem for miniaturized electronic devices. However, the severe wear problem of TVNG causes rapid attenuation of current density, which is difficult to realize long‐term operation with high output. In this work, an effective strategy via interface lubrication is proposed to enhance the direct‐current density and lifetime of TVNGs simultaneously. The water‐based graphene oxide solution is utilized as a lubricant, which can increase the sliding surface carriers to enhance current density, and reduce the wear between the copper and the silicon wafer surface due to its excellent lubrication performance. Hence, the TVNG can generate peak current density output ≈775 mA m−2, accompanied with 31 mC m−2 transfer charges density. The TVNG via interface lubrication can maintain high current output after 30 000 cycles. In addition, it can combine with triboelectric nanogenerator to constitute a dual‐type signal sensor, which can be used to monitor bridge vibration and goods’ weight. This study provides an effective method to solve the wear problem of TVNG and improve direct‐current density simultaneously, which will accelerate the practical application of TVNGs in the future.

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Section: Lifetime Of Gws-tvngmentioning

confidence: 99%

mentioning

confidence: 99%

Simultaneously Enhancing Direct‐Current Density and Lifetime of Tribovotaic Nanogenerator via Interface Lubrication

Qiao

Zhao

Zhou

et al. 2022

Adv Funct Materials

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“…The Van der Waals interactions between the graphene layer and the copper substrate, and those between the flake and the graphene layer are described by the classical 6-12 pairwise Lennard-Jones (LJ) potential. The LJ parameters for the copper substrate-graphene interaction are adopted from previous work [25] with a well-depth of 𝜖 = 27.58 meV and an equilibrium distance of 𝜎 = 0.3083 nm. Following [16], the potential well-depth for the interaction between graphene layer and flake is 𝜖 = 2.968 meV, and the equilibrium distance is 𝜎 = 0.3407 nm.…”

Section: Methodology and Materialsmentioning

confidence: 99%

Oscillation of a graphene flake on an undulated substrate with amplitude gradient

Bian

Nicola

2022

Computational Materials Science

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“…The contact condition that considers the pure shear without normal preceding indentation represents a light tribological loading [ 33 ]. The contact could be considered as penetrable or impenetrable to dislocation passing through, the latter of which was applied in a molecular dynamics study [ 52 ]. The study indeed showed the effect of both surfaces being “penetrable” and “impenetrable” to dislocations, and this would depend on the local constraints and specific material properties of the contacting bodies.…”

Section: Methodsmentioning

confidence: 99%

On the Origin of Plastic Deformation and Surface Evolution in Nano-Fretting: A Discrete Dislocation Plasticity Analysis

Balint

Dini

2021

Materials

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Discrete dislocation plasticity (DDP) calculations were carried out to investigate a single-crystal response when subjected to nano-fretting loading conditions in its interaction with a rigid sinusoidal asperity. The effects of the contact size and preceding indentation on the surface stress and profile evolution due to nano-fretting were extensively investigated, with the aim to unravel the deformation mechanisms governing the response of materials subjected to nano-motion. The mechanistic drivers for the material’s permanent deformations and surface modifications were shown to be the dislocations’ collective motion and piling up underneath the contact. The analysis of surface and subsurface stresses and the profile evolution during sliding provides useful insight into damage and failure mechanisms of crystalline materials subject to nano-fretting; this can lead to improved strategies for the optimisation of material properties for better surface resistance under micro- and nano-scale contacts.

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On the lubrication of rough copper surfaces with graphene

Cited by 15 publications

References 52 publications

Simultaneously Enhancing Direct‐Current Density and Lifetime of Tribovotaic Nanogenerator via Interface Lubrication

Simultaneously Enhancing Direct‐Current Density and Lifetime of Tribovotaic Nanogenerator via Interface Lubrication

Oscillation of a graphene flake on an undulated substrate with amplitude gradient

On the Origin of Plastic Deformation and Surface Evolution in Nano-Fretting: A Discrete Dislocation Plasticity Analysis

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