Molybdenum Disulfide Nanoparticles Research Articles

Probing into crystallography and morphology properties of MoS2 nanoflowers synthesized via temperature dependent hydrothermal method

This paper reports the formation of flower-like hierarchical molybdenum disulfide (MoS2) nanoparticles following a simple one-step hydrothermal process with varying temperatures (200 °C and 220 °C). The as-synthesized particles were examined crystallographically by X-ray diffraction (XRD) method which revealed the formation of hexagonal MoS2 (2H-MoS2) and that the crystallite size of the particles increased with increasing hydrothermal temperature. Surface morphological characteristics of the particles were investigated by a field emission scanning electron microscope (FESEM) and interesting details were revealed such as the rounded 3D flower-like microstructure of the MoS2 particles and the petals of the flowers were composed of platelets built up by stacked-up MoS2 nanosheets. With the increase in hydrothermal temperature, the interlayer spacing of stacked layers of intense (002) plane is slightly decreased although the crystallinity of the material is improved. Both diameter and thickness of the nanoflowers and the nanoplatelets increased twice with increasing the temperatures. A visual crystallographic perspective was presented through simulation of 3D wireframe unit cell associated with the individual lattice planes as observed in the XRD pattern of the samples. In addition, a plausible growth mechanism is proposed for the formation of the obtained MoS2 nanoflowers on the basis of experimental observations and analysis.

Engine oil based MoS2 Casson nanofluid flow with ramped boundary conditions and thermal radiation through a channel

The modern era is a time to have cost-effective and energy-efficient technology. This demand has made nanotechnology the most effective field. The focus of this article is to increase the efficiency of engine oil (EO). The flow of EO-based Casson nanofluid containing Molybdenum disulfide (MoS 2 ) nanoparticles is investigated with ramped wall conditions and thermal radiation. Analytical results are calculated via the Laplace transform. The impact of physical parameters on isothermal and ramped conditions is illustrated graphically and discussed in detail. The researchers found that flow, mass, and energy can be controlled by using ramped conditions. The variation in concentration, temperature, and velocity is exponential for isothermal conditions and steady for ramped wall conditions. Finally, the results of Nusselt numbers, skin frictions, and Sherwood numbers on both walls of the channel for both isothermal and ramped conditions are graphically depicted and discussed. For higher values of time the results of ramped and isothermal wall conditions are identical. It is found that the nanoparticles of MoS 2 enhance the lubrication and heat transport rates of EO.

Effect of the carbon support on MoS2 hybrid nanostructures prepared by an impinging jet reactor for hydrogen evolution reaction catalysis

The use of an impinging jet reactor to synthesize hybrid nanostructures is a facile, scalable, and a continuous production method of materials with desired catalytic and capacitive properties. In this paper, we study the possibility of using different carbon nanomaterials (CNMs), such as graphene oxide (GO), reduced graphene oxide (rGO), and carbon nanotubes (CNTs) as a support for molybdenum disulfide (MoS2) nanoparticles prepared in the impinging jet reactor. The influence of the used supports’ different properties on the final products was investigated. The proposed synthesis method allowed obtaining both mostly amorphous or crystalline hybrid MoS2/CNMs nanostructures. Moreover, catalysts with different weight ratios of MoS2 and CNMs were synthesized. Carbon nanomaterials added during the reaction allowed obtaining smaller MoS2 particle sizes with exposed active sites, and an activated basal plane of MoS2, as well as increasing the samples electron conductivity leading to enhanced catalytic activity for HER. For samples based on GO and CNTs, the mostly amorphous structure showed superior catalytic activity. The best sample was MoS2/GO with an assumed mass ratio of 50/1, annealed at 550 °C giving an overpotential of − 0.217 V vs. RHE for HER and a double-layer capacitance equal to 37.3 mF/cm2.

The enhancement of wear properties of compressor oil using MoS2 nano-additives

MoS2 nanoparticles have been considered valuable materials in lubricating applications due to their layered morphology. This work synthesized spherical MoS2 nanoparticles that held many nanosheets through the hydrothermal method. The thickness of these sheets is between 10 and 25 nm, and their length is estimated to be about 200 nm. The effect of nanoparticles concentration on wear properties was investigated in this research. The four-ball test measured the wear performance of nano lubricants. The results showed that all nano lubricants had better wear performance than the base lubricant (Behran Compressor 68). However, molybdenum disulfide nanoparticles synthesized as nanosheets with a thickness of 10 nm had the best performance. At a concentration of only 0.05 wt-%, the resulting nano lubricant reduced the wear width and friction coefficient by about 50%. The thermal conductivity coefficient results also showed that nanoparticles increased this coefficient. As the lubricant temperature increases, the difference between the nano and base lubricant's thermal conductivity increases.

Controllable fabrication of magnesium silicate hydroxide reinforced MoS2 hybrid nanomaterials as effective lubricant additives in PAO

Molybdenum disulfide (MoS2) nanoparticles have poor dispersion stability and poor resistance to extreme pressures, which severely limit their application as lubricant additives. Here, magnesium silicate hydroxide (MSH) reinforced MoS2 hybrid nanomaterials were synthesized by a facile hydrothermal method, and their tribological behaviors as lubricant additives to polyalphaolefin (PAO) were investigated. Results show that the controllable preparation of MSH-MoS2 nanoparticles with different morphologies, compositions, and binding states can be achieved simply by changing the reaction temperature. MoS2 and MSH combine better at the reaction temperature of 220 °C (MM2) because of the edge-pinning effect caused by noncoherent. Due to its abundance of active anchoring sites, MM2 exhibits superior dispersion stability. Importantly, the anti-friction performance, wear-resistance, and last non-seizure load of the friction pairs lubricated in PAO-MM2 are improved by 44.8%, 41.2 %, and 116.6%, respectively. The outstanding tribological behaviors should be credited to the formed robust bilayer tribo-film: the upper layer contains abundant MoS2, providing outstanding anti-friction functionality; whereas the adjacent layer, which is made up of MSH and reaction products of the lubricant additive and substrate, strongly ensures the stability of the first layer.

3D Neural Network Composed of Neurospheroid and Bionanohybrid on Microelectrode Array to Realize the Spatial Input Signal Recognition in Neurospheroid.

There have been several studies for demonstration of 2D neural network using living cells or organic/inorganic molecules, but to date, there is no report of development of a 3D neural network in vitro. Based on developed bionanohybrid composed of protein, DNA, molybdenum disulfide nanoparticles, and peptides for controlling electrophysiological states of living cells, here, the in vitro 3D neural network composed of the bionanohybrid, 3D neurospheroid and the microelectrode array (MEA) is developed. After production of the 3D neurospheroid derived from human neural stem cells, the bionanohybrid developed on the MEA successfully semi-penetrates the neurites of the 3D neurospheroid and forms the 3D neural network. The developed 3D neural network successfully exhibited the electrophysiological output signals of the 3D neurospheroid by transmitting the input signal applied by the bionanohybrid. Moreover, by using the selectively immobilized bionanohybrid on the MEA, the spatial input signal recognition in the neurospheroid of 3D neural network is realized for the first time. This newly developed in vitro 3D neural network provides a promising strategy to be applied in brain-on-a-chip, brain disease-related drug efficacy evaluation, bioelectronics, and bioelectronic medicine.

Analysis of Turning Performance on AISI O1 Steel Using VO+nMoS2 as Coolant

AISI O1 cold work steel is a hard-to-machine material as a reason of its good temperature resistance, superficial hardness, and lesser response to wear. Hence, material removal from such hard materials is both cost- and time-consuming. Conventional cutting fluids fail to lessen the hotness at the tool-work junction. This research work explores the effects of a uniquely prepared and eco-friendly cutting fluid on the cutting performance of AISI O1 steel using tool inserts of three different materials. The prepared cutting fluid, molybdenum disulfide nanoparticle (MoS2) blended in biodegradable vegetable oil (VO) was distributed into the cutting zone with the help of the minimum quantity lubricant (MQL) technique. The integrated approach of Taguchi’s average normalized S/N ratio-based RSM method was employed to model the parameters for better responses. The optimal condition predicted by the approach (the type of insert – CBN, Vc – 110.12 m/min, f – 0.08 mm/rev, and DOC – 0.20076 mm) was observed to produce noteworthy improvements in tool wear and lessen the cutting force in addition to a good surface finish. The study will offer the required guidance for tool and die industries handling AISI O1 steel and help researchers work towards sustainable machining.

Analysis of vegetable oil-based nano-lubricant technique for improving machinability of Inconel 690

Conventional cutting fluids are applied to dissipate the heat generated in the cutting zone during machining. However, the use of metal cutting fluids causes adverse impacts on workers' health and the environment. Minimum quantity lubrication (MQL) has drawn attention to eliminating the use of mineral-based cutting fluids. The effectiveness of MQL can be further enhanced by employing vegetable oil and nanoparticles. Nanofluid-based lubricants result in superior heat transfer capacity and improved lubricity. In this context, the performance of vegetable oil mixed with and without molybdenum disulfide nanoparticles (nMoS2) applied with MQL is investigated during the machining of Inconel 690. The nanoparticles with different concentrations (0.5%, 1%, and 1.5%) are added in canola oil, and friction coefficient, thermal conductivity, viscosity, and wettability of nanofluids are analyzed. The machining experiments are performed under dry, flood cooling, MQL, and nMQL. The machining performance is evaluated by measuring tool wear, surface roughness, chip morphology, cutting temperature, and energy consumption. The findings revealed the superiority of nMQL with 54%, 29%, and 13% reduction in surface roughness and 56%, 39%, and 12% reduction in energy consumption compared to dry, flood cooling, and MQL environments. Also, nMQL has led to longer tool life. The effectiveness of nMQL has resulted in better tribological conditions in the cutting zone with enhanced cooling/lubricating action of vegetable oil and lamellar structure of nMoS2. The results show a significant role of nano-cutting fluid-based lubricant applications in the machining industry to meet energy-saving and sustainability goals without compromising product quality.

A novel paraoxon imprinted electrochemical sensor based on MoS2NPs@MWCNTs and its application to tap water samples

Organophosphorus pesticides are widely utilized in agricultural fertility. However, their long-term accumulations result in serious damage to human health and ecological balance. Paraoxon (PAR) can block acetylcholinesterase in the human body, resulting in death. Thus, in this study, a molecularly imprinted electrochemical PAR sensor based on multiwalled carbon nanotubes (MWCNTs)/molybdenum disulfide nanoparticles (MoS2NPs) nanocomposite (MoS2NPs@MWCNTs) was proposed for selective tap water determination. A hydrothermal fabrication approach was firstly implemented to prepare MoS2NPs@MWCNTs nanocomposite. Afterwards, the formation of PAR imprinted electrochemical electrode was performed on nanocomposite modified glassy carbon electrode (GCE) in presence of PAR as template and pyrrole (Py) as a monomer by cyclic voltammetry (CV) technique. Just after determining the physicochemical features of as-fabricated nanostructures by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), Raman spectroscopy, and atomic force microscopy (AFM), the electrochemical behavior of the fabricated sensors was determined through CV, differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). The suggested imprinted electrode provided the acceptable limit of quantification (LOQ) and limit of detection (LOD) values of 1.0 × 10−11 M, and 2.0 × 10−12 M, respectively. As a consequence, the proposed PAR imprinted electrochemical sensor can be offered for the determining safe tap water and its utility.

Electromagnetohydrodynamic boundary layer flow in hybrid nanofluid with thermal radiation effect: Numerical simulation

AbstractHybrid nanofluid boundary layer flow past a stretching surface with zero mass flux boundary condition is explored in this article. The main aim of this article is to analyze the electromagnetohydrodynamic role in a hybrid nanofluid containing silver and molybdenum disulfide nanoparticles. The self‐similar solution is embedded to reduce the governing partial differential equation into algebraic equations and a shooting algorithm is applied to obtain the solution of the resultant boundary value problem. Variation in momentum, energy, and nanoparticle concentration is explained through graphical profiles. Nusselt number and drag force coefficients are computed for various flow parameters and their impact on the nanofluid and hybrid nanofluid is computed and presented and explained in a comparative fashion. It is observed that the velocity profile shows the opposite nature with respect to the electric field and magnetic field. For electric field parameter velocity accelerates whereas for magnetic parameter velocity diminishes. Nusselt number increases with electric field parameter and nanoparticle volume fraction.

Molybdenum Disulfide Nanoparticles Coated with Silver Nanoparticles for Low-Toxicity and Dual Photothermal–Chemical Antibacterial Activity

In this paper, a simple method has been used to synthesize silver-molybdenum disulfide nanoparticles (Ag-MoS2NPs) with photothermal and physical inhibition of bacteria. The MoS2nanocarriers were obtained by an environment-friendly liquid-phase separation method. The coated Ag NPs with high antibacterial activity and fluorescence property endowed the synthesized Ag-MoS2NPs with the ability to be traced. The Ag-MoS2NPs had photothermal properties with a maximum photothermal increase of [Formula: see text]C. The results of the dual photothermal–chemical antibacterial activity using Ag-MoS2NP carriers showed that Ag-MoS2NPs had broad-spectrum inhibition activity with MIC values up to [Formula: see text][Formula: see text][Formula: see text]g/mL against Escherichia coli. The Ag-MoS2NPs were also used to destroy cell integrity by disrupting cell membranes and cell walls to achieve the inhibition of cell survival. The toxicity test in mice demonstrated the nontoxicity of Ag-MoS2NPs. Ag-MoS2NPs were studied for dual photothermal–chemical antibacterial activity, and the material reduced the amount of Ag NPs used, resulting in lower biotoxicity, hence providing a possible avenue for the clinical application of Ag NPs.

Increment of heat transfer by graphene-oxide and molybdenum-disulfide nanoparticles in ethylene glycol solution as working nanofluid in penetrable moveable longitudinal fin

The main interest of the current research study is, on the one hand, to increase heat transfer of the base and mixture fluids by using hybrid nanoparticles. By considering two types of boundary conditions such as insulated and convective tips, to explore numerically and analytically the simultaneous impacts of the thermal radiative and free convective flow of hybrid nanofluid via a moving porous longitudinal fin. This investigation employs Darcy’s model and the mixture base fluid H2O (50%)–C2H6O2 (50%). The governing equations have been solved by utilizing Runge–Kutta–Fehlberg 4th–5th order technique (RKFT45) with shooting-scheme and analytically via Duan–Rach Approach (DRA). It is found that the nondimensional temperature is a decreasing function of a wet porous number and convective parameter for both insulated and convective tips, and as an increasing function of ambient temperature , Peclet number Pe and power index n. It is also found that the thermal profile presents a decrease for all considered shape factors in the cases of insulated and convective tips boundary conditions. Computational results and those obtainable in the previous works have been used to verify and strengthen the results gained by the analytical DRA technique.

Fabrication of Epsilon-Polylysine-Based Magnetic Nanoflowers with Effective Antibacterial Activity against Alicyclobacillus acidoterrestris.

The risk of fruit juice contamination caused by microorganisms, especially Alicyclobacillus acidoterrestris, has been reported worldwide. To develop cost-effective control methods, in this work, flower-like magnetic molybdenum disulfide (Fe3O4@MoS2) nanoparticles (NPs) were fabricated by a facile two-step hydrothermal method. After further modifying polyacrylic acid (PAA) on the surface of the NPs, epsilon-polylysine (EPL) was immobilized via N-(3-dimethylaminopropyl)-N-carbodiimide hydrochloride/N-hydroxysuccinimide coupling reaction to obtain the Fe3O4@MoS2@PAA-EPL nanocomposites. Antibacterial results exhibited that the synthesized nanocomposites showed effective antibacterial activity against A. acidoterrestris with a minimum inhibitory concentration of 0.31 mg mL-1. Investigation on the antibacterial mechanism revealed that the presence of nanocomposites caused damage and disruption of the bacterial membrane through dent formation, resulting in the leakage of intracellular protein. Moreover, the activity of dehydrogenase enzymes was inhibited with the treatment of Fe3O4@MoS2@PAA-EPL, causing the reduction of metabolic activity and adenosine triphosphate levels in bacteria. Simultaneously, the presence of nanocomposites improved intracellular reactive oxygen species levels, and this disrupted the antioxidant defense system and caused oxidative damage to bacteria. Furthermore, Fe3O4@MoS2@PAA-EPL nanocomposites were confirmed to possess satisfactory biocompatibility by performing in vitro cytotoxicity and in vivo acute toxicity experiments. The aim of this research was to develop a new pathway for the inhibition of A. acidoterrestris in the juice industry.

Development of multiwalled carbon nanotubes (MWCNT's) functionalized with molybdenum disulfide (MoS2) by separate methodology

Carbon nanotubes have considerable potential for many applications due to their unique physical and chemical properties. In this work, Multiwalled Carbon Nanotubes (MWCNT's) were synthesized by chemical vapor deposition and functionalized with molybdenum disulfide (MoS2) nanoparticles. The obtained nanostructures were characterized by SEM, TEM, Raman, XRD, XPS and TGA. Hybrid nanostructures of MWCNT's/MoS2 with stable MoS2 layer thickness of ~2 nm was obtained. The functionalized nanotubes showed variations in crystal structure, chemical composition, and thermal response with respect to the uncoated ones, so these structures are expected to have potential use in diverse engineering fields.

Localized Plasmon-Based Multicore Fiber Biosensor for Acetylcholine Detection

In this work, tapered/etched multicore fiber (MCF) probes are spliced with multimode fiber (MMF) to fabricate the sensor structure. To improve sensitivity, gold nanoparticles (AuNPs) and molybdenum disulfide nanoparticles (MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -NPs) are used to immobilize both probes. Synthesized AuNPs and molybdenum disulfide (MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> )-nanoparticles (NPs) have peak absorption wavelengths of 519 and 330 nm, respectively. High-resolution transmission electron microscopy is used to examine the morphology of the NPs. The scanning electron microscope (SEM) is used to characterize the NP-immobilized optical fiber sensor structures, and SEM-EDX is used to verify the NP-coating over fiber structure. The functionalization of the acetylcholinesterase enzyme over the NP-immobilized probe increases the specificity of the sensor later on. Finally, the developed sensor probes are tested by detecting various acetylcholine concentrations. In addition, performance analyses, such as reusability, reproducibility, and selectivity (in the presence of ascorbic acid, glucose, dopamine, and uric acid), are carried out, and proposed biosensors are experimentally evaluated. The developed tapered fiber sensor with a sensitivity of 0.062 nm/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{M}$ </tex-math></inline-formula> can detect even very low concentrations, such as 14.28 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{M}$ </tex-math></inline-formula> , over a wide detection range of 0–1000 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{M}$ </tex-math></inline-formula> .

2-D Nanomaterials Assisted LSPR MPM Optical Fiber Sensor Probe for Cardiac Troponin I Detection

This study used localized surface plasmon resonance (LSPR) technology to develop an optical fiber biosensor for the detection of cardiac troponin I (cTnI). The etched core mismatch, multimode&#x2013;photosensitive&#x2013;multimode (MPM) fiber structure, is used in this study. Following that, graphene oxide (GO), gold nanoparticles (AuNPs), and molybdenum disulfide nanoparticles (MoS₂-NPs) are immobilized to the etched MPM surface to improve the sensitivity and stability of the sensor probe. Furthermore, the sensing surface is functionalized with an enzyme to improve the selectivity performance. The absorption spectrum of nanomaterials is determined using a UV-Vis spectrophotometer and a transmission electron microscope (TEM), while the surface of an immobilized probe was observed using a scanning electron microscope (SEM). To determine the sensor&#x2019;s reliability, a variety of experiments are carried out, including sensing, reusability, reproducibility, stability, pH, and selectivity. Sensitivity of 3.4 pm/(ng/mL), a correlation coefficient of 0.928, limit of detection (LoD) of 96.2638 ng/mL, and linear range of 0&#x2013;1000 ng/mL are among the sensor&#x2019;s final performance specifications.

Influence of molybdenum disulfide particles’ concentration on waste cooking oil nano fluid coolant in cutting force reduction on machining SAE 1144 steel

Utilization of waste cooking oil to develop a Nanofluid with Molybdenum disulfide Nanoparticles for a metal machining application is focused in this research. Based on the nature of lubricating, non-corrosive and biodegradable properties the waste cooking oil and nano Molybdenum disulfide combination is preferred in this research. Molybdenum disulfide Nano-particles enriched waste cooking oil in minimizing cutting forces. This investigation involved 2 group of samples the group-I is control group in which the samples machined (turning) in heavy duty lathe by green machining method. The sample of intervention group machined Nanofluids with variable concentration of Molybdenum disulfide between 0.1 and 0.25 wt%. The sample size estimated with G-Power 80% and was 12 per group but 16 samples group considered to conducting experiments and optimizing the process parameters by means of Taguchi analysis. The results of cutting forces encountered were measured under various combinations of similar input conditions for both green machining and Molybdenum disulfide Nano-particles enriched waste cooking oil based wet machining method for lathe machining of AE 1144 shaft. The statistical test reveals that Molybdenum disulfide Nano-particles enriched waste cooking oil based wet machining method averagely reduced the cutting force 27.53% than green machining method. The significant value is 0.001 (p < 0.05). It was ensured that the results did not violate the statistical assumption.

Swirling flow of fluid containing (SiO2) and (MoS2) nanoparticles analyze via Cattaneo-Christov theory.

Investigation of heat transport mechanism in swirling flow of viscous fluid containing silicon dioxide and molybdenum disulfide nanoparticles is performed. The flow is engendered due to stretchable rotating cylinder which immersed in infinite fluid. The boundary layer assumption is applied to simplify the governing equations of the problem. The theory of Cattaneo-Christov for thermal energy transportation is employed in the present phenomenon under the heat and mass constraints. The flow is also influenced by Lorentz force. The results for flow field, temperature, and concentration field are produced by employing the bvp4c numerical technique to the similar differential equations. According to the observations, it is noted that in the presence of Lorentz force the reduction in velocity field of the nanofluid occurs. The thermal and solutal relaxation phenomena also declines the energy transport in nanofluid flow. The outcomes are validated through the comparison with previous published studies.

Taper-in-taper fiber structure-based LSPR sensor for alanine aminotransferase detection

Alanine aminotransferase (ALT), a critical component of human blood, is inextricably associated with liver injury. The current study develops a novel biosensor based on the localized surface plasmon resonance (LSPR) principle for the detection of ALT analytes at concentrations ranging from 0 to 1000 Units per liter (U/L). According to the authors' knowledge, this is the first time an optical fiber structure with a taper-in-taper structure has been developed for biosensing applications. It is fabricated using the three-electrode semi-vacuum taper technique and is characterized using a combiner manufacturing system. Gold nanoparticles (AuNPs), molybdenum disulfide nanoparticles (MoS2-NPs), and cerium oxide nanoparticles (CeO2-NPs) are immobilized on the sensing region to improve the sensing performance. Prior to application, these nanoparticles are characterized using a high-resolution transmission electron microscope (HR-TEM) and a UV-Visible spectrophotometer. AuNPs promote the LSPR phenomenon, whereas MoS2-NPs/CeO2-NPs contribute to the sensor probe's biocompatibility and stability. Following that, the probe surface was functionalized with glutamate oxidase (GluOx) to improve selectivity. The probe demonstrated an excellent linear relationship with the subsequent assay's ALT concentration. Additionally, the probe's performance characteristics such as reusability, reproducibility, stability, and selectivity are evaluated in order to determine its clinical utility in diagnosing liver injury.

Nanosized molybdenum disulfide on surface‐modified carbon material as lubricating oil additive for friction‐reduction and anti‐wear

AbstractFor the first time, nanosized molybdenum disulfide (MoS2) nanoparticles (NPs) were grown on the surface of poly(ethylene glycol)‐polydopamine‐modified reduction graphene oxide) nanosheets (rGO‐PDA‐PEG). The obtained rGO‐PDA‐PEG@MoS2 nanocomposites exhibits excellent dispersion in polyalkylene glycol (PAG) synthetic oil and outperforms GO and MoS2 NPs as additives in terms of friction reduction and wear resistance at elevated temperature. The superior tribological behaviour of rGO‐PDA‐PEG@MoS2 might be beneficial to the synergistic effect between MoS2 and rGO.