Tunable lubricity of aliphatic ammonium graphite intercalation compounds at the micro/nanoscale

Liu, De-E; Xie, Guoxin; Cui, Ziyi; Si, Lina; Wan, Chunlei; Wu, Zou

doi:10.1016/j.carbon.2017.01.049

Cited by 8 publications

(6 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The G peaks of GICs/TOAB at −2 V and −2.5 V partly move to the right, which could be considered as new peaks with a combination of the ~1580 cm −1 peak and the ~1600 cm −1 peak. The shifted G peak is associated with the energy shift, which was caused by the electron transfer from the graphene layers to the intercalated cations [ 33 , 36 , 38 , 39 ]. Furthermore, the 2D peak of GIC/TOAB at −1.5 V is similar to pristine graphite powder, which indicates the intercalation was insufficient for GIC at −1.5 V. Red shifts of the 2D peaks of the GICs/TOAB at −2 V and −2.5 Vas compared to those of pristine graphite powder can be observed.…”

Section: Resultsmentioning

confidence: 99%

“…If the tetraalkylammonium salts have shorted chains, the interlayer space would not be as large as that of long chain tetraalkylammonium salts because of smaller intercalation molecules. In this instance, the pucker effect decreases, and the friction would be smaller than that of long chain salts, but it would still be larger than pristine graphite [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

“…The effects of electrolysis potential, electrolysis time, and electrolyte concentration of TOAB were explored. The results show that the intercalation substance could not be intercalated into the graphite in the cases of small electrolysis potentials or low electrolyte concentrations, and the larger electrolysis potential, the longer electrolysis time, and the higher electrolyte concentration of TOAB would give rise to sufficient intercalation reaction [ 33 ]. Hence, different GICs would be produced by choosing different electrolysis potentials, electrolysis times, and electrolyte concentrations.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Although many studies about the wear of graphite and the synthesis of GICs have been conducted, the understanding of the friction and wear of GICs is still superficial. In our previous work, it has been found that the friction forces of the synthesized TAA/GICs are almost one-third of those of the pristine graphite at different scales [ 33 ]. In order to deepen our understanding on the tribological properties of GICs, the friction and wear properties of TAA/GICs prepared with different intercalate potentials have been studied at nanoscale under relatively large applied pressures on the basis of AFM experiments.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nanotribological Properties of Graphite Intercalation Compounds: AFM Studies

Chen

Guo

2017

Scanning

Self Cite

View full text Add to dashboard Cite

Tetraalkylammonium salts have larger ions than metal ions, which can greatly change the interlayer space and energy, and then potentially tune the properties of graphite. In this work, various graphite intercalation compounds (GICs) have been synthesized by intercalating tetraoctylammonium bromide (TOAB) ions into graphite through electrochemical interactions under different reduction potentials. Different degrees of expansion between graphite layers as well as their corresponding structures and topographies have been characterized by different analytical techniques. The nanoscale friction and wear properties of these GICs have been investigated by AFM-based nanofrictional and scratch tests. The results show that electrochemical intercalation using tetraalkylammonium salts with different interaction potentials can tune the friction and wear properties of graphite. Under relatively large applied loads of AFM tips, friction increase and wear can be easier to occur with the increase of the intercalation potential. It is inferred that the increases of both the interlayer space of graphite and the number of ions on the surface give rise to puckered effect and formation of rougher surfaces. This work gives us deep insight into the friction and wear properties of GICs as composite lubrication materials, which would be of great help for material design and preparation.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nanotribological Properties of Graphite Intercalation Compounds: AFM Studies

Chen

Guo

2017

Scanning

Self Cite

View full text Add to dashboard Cite

show abstract

“…Besides, materials with a smaller elasticity modulus had larger friction due to the larger elastic deformation in softer materials, indicating that stiffness played a significant role in the friction on the flexible substrate. , Though the tuning of friction of graphene on the soft elastic substrate was carried out at the nanoscale, the study at the microscale is still needed to be investigated. Liu et al reported that frictional behaviors of graphite could be modulated by the intercalation of chemical substances with the coefficients of friction almost one-third of that of the pristine graphite at the microscale, whereas it was suitable for the solid–liquid composite lubricant systems . The tuning of friction of graphene on the soft elastic substrate for the solid–solid lubricant systems is needed to implement at the microscale.…”

Section: Introductionmentioning

confidence: 99%

Flexible Tuning of Friction on Atomically Thin Graphene

Zhao

Zhang

Chen

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The tuning of flexible microscale friction is desirable for the reliability of wearable electronic devices, tactile sensors, and flexible gears. Here, the tuning of friction of atomically thin graphene on a flexible polydimethylsiloxane (PDMS) substrate was obtained with the elastic modulus using a 1H,1H,2H,2Hperfluorodecyltrichlorosilane (FDTS) self-assembly monolayers (SAMs)-modified microsphere probe with the diameter of 5 μm at the microscale. The friction can be tuned at a large scale with the difference in the elastic modulus of PDMS and thickness of graphene. The hydrophobic property of the FDTS SAMs-modified probe decreased friction by reducing interfacial adhesion and preventing the effect of capillary interaction; thus, the friction decreased with the increase in the elastic modulus of the PDMS substrate due to decreasing indentation depth and thus the interfacial contact area; and also, the enhanced out-of-plane stiffness effectively decreased the interfacial contact quality with the increase of the thickness of graphene. The flexible tuning of friction on graphene was further verified by the theoretical calculation from the aspects of the friction arising from the normal and lateral deformation around the contacting area. This work is meaningful for promoting the design and reliability of flexible micro-devices.

show abstract

Energy Accumulation Enabling Fast Synthesis of Intercalated Graphite and Operando Decoupling for Lithium Storage

Wang

Huang

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Metal chloride‐intercalated graphite with multiple/versatile functions is one of the promising categories for charge storage, especially in achieving high volumetric and gravimetric performance simultaneously. Herein, a novel field‐induced energy accumulation strategy is proposed and demonstrated to achieve minute‐level fast preparation of stage‐1 dominated FeCl3‐graphite intercalation compounds (GICs). The microwave‐induced Joule heat and electron excitation from the graphite conjugated system produce the arc plasmas with high energy density in the limited microenvironment, accompanied by the enhanced internal energy of gaseous reactant molecules and the strengthened intercalation reaction kinetics. When evaluating the anode for lithium storage, the FeCl3‐graphite intercalation compounds feature the promoted self‐activation characteristics and deliver a high volumetric capacity up to 1650 mAh cm−3. In particular, with the assistance of the operando Raman technique, it is interesting to find that the electronic decoupling effect among graphite and FeCl3 layers is responsible for the self‐activation process. Thus, it is reasonable to believe that this work can further offer an insightful and referable idea into the in‐depth investigation of metal chloride intercalated graphite, especially for applications in lithium storage.

show abstract

Tunable lubricity of aliphatic ammonium graphite intercalation compounds at the micro/nanoscale

Cited by 8 publications

References 42 publications

Nanotribological Properties of Graphite Intercalation Compounds: AFM Studies

Nanotribological Properties of Graphite Intercalation Compounds: AFM Studies

Flexible Tuning of Friction on Atomically Thin Graphene

Energy Accumulation Enabling Fast Synthesis of Intercalated Graphite and Operando Decoupling for Lithium Storage

Contact Info

Product

Resources

About