A review on electrical and gas-sensing properties of reduced graphene oxide-metal oxide nanocomposites

V, Kiranakumar. H.; R, None Thejas; Naveen, C. S.; Khan, M. Ijaz; Prasanna, G D; Reddy, Sathish; Oreijah, Mowffaq; Guedri, Kamel; Bafakeeh, Omar T.; Jameel, Mohammed

doi:10.1007/s13399-022-03258-7

Cited by 97 publications

(45 citation statements)

References 72 publications

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“…Many nano-additives, such as Au, Ag, Al 2 O 3 , TiO 2 , CuO, graphene, carbon nanotubes, carbon nanofibers, and cellulose, were evaluated to enhance their mechanical, physical, and tribological properties. The uniform dispersion of nanofillers in the polymeric matrix contributes to significantly improving their characteristics [ 7 , 8 , 9 , 10 , 11 ]. Composite systems were performed, which led to an impact on their unique attributes compared to pure polymers.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Tribological Performance of HDPE Matrix Reinforced by Hybrid Gr/TiO2 NPs for Hip Joint Replacement

Nabhan

Sherif

Abou-Zeid

et al. 2023

JFB

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Hip joint collapse is a very common health problem. Many cases need a joint replacement, so nano-polymeric composites are an ideal alternative solution. Due to its mechanical properties and wear resistance, HDPE might be considered a suitable alternative to frictional materials. The current research focuses on using hybrid nanofiller TiO2 NPs and nano-graphene with various loading compositions to evaluate the best loading amount. The compressive strength, modules of elasticity, and hardness were examined via experiments. The COF and wear resistance were evaluated via a pin-on-disk tribometer. The worn surfaces were analyzed based on 3D topography and SEM images. The HDPE samples with various compositions of 0.5%, 1.0%, 1.5%, and 2.0 wt.% filling content of TiO2 NPs and Gr (with a ratio of 1:1) were analyzed. Results revealed that hybrid nanofiller with a composition of 1.5 wt.% exhibits superior mechanical properties compared to other filling compositions. Moreover, the COF and wear rate decreased by 27.5% and 36.3%, respectively.

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Section: Introductionmentioning

confidence: 99%

Mechanical and Tribological Performance of HDPE Matrix Reinforced by Hybrid Gr/TiO2 NPs for Hip Joint Replacement

Nabhan

Sherif

Abou-Zeid

et al. 2023

JFB

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“…12 Compared to metal oxides, metal sulfides are cheaper and exhibit excellent stability because of their distinctive physico-chemical nature like high electrical conductivity and brilliant thermal and mechanical stability. 13,14 Moreover, they are abundant in nature, less toxic, eco-friendly, and rich in redox chemistry; therefore, they would be promising electrodes for energy storage and conversion. 15 Likewise, metal sulfides have lower intrinsic electrical resistivity than the other transition metals.…”

Section: Introductionmentioning

confidence: 99%

“…have been used for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). − However, metal oxides are extensively used in water splitting applications; nevertheless, their cost was moderate and they were unstable for long time . Compared to metal oxides, metal sulfides are cheaper and exhibit excellent stability because of their distinctive physico-chemical nature like high electrical conductivity and brilliant thermal and mechanical stability. , Moreover, they are abundant in nature, less toxic, eco-friendly, and rich in redox chemistry; therefore, they would be promising electrodes for energy storage and conversion . Likewise, metal sulfides have lower intrinsic electrical resistivity than the other transition metals.…”

Section: Introductionmentioning

confidence: 99%

Ternary Copper Iron Sulfide Microflowers Anchored on Reduced Graphene Oxide for Water Splitting

Swathi

Yuvakkumar

Ravi

et al. 2023

ACS Appl. Nano Mater.

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Transition metal sulfides are widely employed as bifunctional electrocatalysts owing to their unique structural features, well-off active sites, and modifiable electronic and mechanical properties. Herein, we have synthesized highly efficient ternary copper iron sulfide (CuFeS 2 )/reduced graphene oxide (rGO) composites via a hydrothermal approach for an overall water splitting process. The tetragonal structure of CuFeS 2 microflowers anchored on rGO sheets is identified by using Xray analysis and compared with standard Joint Committee on Powder Diffraction Standards (JCPDS) #35-752. In Raman spectra, the existence of two bands D (defects) and G (graphitic) confirms the presence of the rGO composite with CuFeS 2, and the ratio of D and G band (I D /I G ) is observed to be 1.18. The morphological analysis using scanning electron microscopy and transmission electron microscopy substantiates the formation of microflowers with rGO sheets. The elemental composition of CuFeS 2 /rGO was analyzed by energy-dispersive X-ray analysis, which demonstrated a weight percentage of various compositions of Cu (18.07%), Fe (11.32%), S (13.88%), and C (56.74%). Moreover, the CuFeS 2 /rGO composites exhibited a high surface area, pore volume, and diameter of 50.352 m 2 /g, 0.162 cc/g, and 2.471 nm, respectively. The fabricated electrodes were examined by using electrochemical characterization. The obtained results clearly showed low overpotential and low Tafel slope values in both the oxygen evolution reaction (OER) (176 mV and 216 mV/dec) and hydrogen evolution reaction (HER) (153 mV and 150 mV/dec) processes. In addition, the fabricated composite exhibited low 1.59 V cell voltages for an overall water splitting process with more excellent stability, and it showed a faradaic efficiency of 97.8% for H 2 and 95.5% for O 2 . Therefore, the composite of rGO in ternary metal sulfide plays a predominant role in improving the electrocatalytic activity of the material, and the CuFeS 2 /rGO composite emerges as a promising electrode for the water splitting process.

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“…In light of the above applications of flows in microchannels, this paper aims to discuss the flow of viscoelastic fluid. The constitutive equation of upper convected Maxwell fluid and another fluid model used by [ 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 ] having the properties both of elasticity and viscosity are used to describe the non-Newtonian rheology of the fluid. Along with the conservation laws, an equation of state is used to incorporate a variation in the density of the fluid.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Mathematical Investigation of Blood-Based Flow of Compressible Rate Type Fluid with Compressibility Effects in a Microchannel

et al. 2022

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In this investigation, the compressibility effects are visualized on the flow of non-Newtonian fluid, which obeys the stress–strain relationship of an upper convected Maxwell model in a microchannel. The fundamental laws of momentum and mass conservation are used to formulate the problem. The governing nonlinear partial differential equations are reduced to a set of ordinary differential equations and solved with the help of the regular perturbation method assuming the amplitude ratio (wave amplitude/half width of channel) as a flow parameter. The axial component of velocity and flow rate is computed through numerical integration. Graphical results for the mean velocity perturbation function, net flow and axial velocity have been presented and discussed. It is concluded that the net flow rate and increase in case of the linear Maxwell model, while they decrease in case of the convected Maxwell model. The compressibility parameter shows the opposite results for linear and upper convected Maxwell fluid.

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A review on electrical and gas-sensing properties of reduced graphene oxide-metal oxide nanocomposites

Cited by 97 publications

References 72 publications

Mechanical and Tribological Performance of HDPE Matrix Reinforced by Hybrid Gr/TiO2 NPs for Hip Joint Replacement

Mechanical and Tribological Performance of HDPE Matrix Reinforced by Hybrid Gr/TiO2 NPs for Hip Joint Replacement

Ternary Copper Iron Sulfide Microflowers Anchored on Reduced Graphene Oxide for Water Splitting

Modeling and Mathematical Investigation of Blood-Based Flow of Compressible Rate Type Fluid with Compressibility Effects in a Microchannel

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