Graphene - Science topic

A novel method for synthesizing carbon-containing graphene nanosheets (CCG) from corn cob (CC) waste was developed.

Materials made up of graphene possess advantageous qualities which make them well-suited for use in supercapacitors and other energy storage devices. These include outstanding electrical conductivity, robustness, outstanding chemical stability, and the ability to adjust the surface area. This review looks at the recent advancements in the use of ma...

Materials made up of graphene possess advantageous qualities which make them well-suited for use in supercapacitors and other energy storage devices. These include outstanding electrical conductivity, robustness, outstanding chemical stability, and the ability to adjust the surface area. This review looks at the recent advancements in the use of ma...

This study explores the postulated potential of tetrafullerene as a charge transport material when combined with dispersed graphene oxide (GO), over concerns about fullerene's limited performance in similar devices. Incorporating GO is expected to augment carrier concentration, increase surface area, and reduce operating voltages. Devices fabricate...

This work presents a stable and switchable dual-band generation from a polarization-dependent Erbium-doped fiber laser mode-locked by monolayer graphene as a saturable absorber. The ultrashort generated pulses at single band exhibit spectral (temporal) widths of 8.8 nm (305 fs) and 9 nm (384 fs) at 1536 nm and 1557 nm, respectively, while the simul...

A high-absorption graphene-quartz sand composite coating was developed to enhance terahertz (THz) absorption over a broad frequency range. The coating demonstrated optimal absorption efficiency of 97.37% at 100 GHz when mixed in a 2.5:1 ratio of graphene to quartz sand, with a particle size of 350–550 μm. Absorption performance across the 100–220 G...

In this study, the impact of surface charge mobility on alternating current electroosmotic flow (ACEOF) in graphene nanochannels is the primary investigation. By taking into account the lateral movement of the adsorbed surface charge, the slip velocity condition of the hydrophobic surface is modified, and the impact of the adsorbed lateral movement...

Thermal nonreciprocity are typically realized by using nonlinear heat conductivity, external field bias or spatiotemporal modulation of thermal parameters, but these methods require specific material properties or accurate modulation means. Low-dimensional materials like graphene provides a platform to engineer heat transport characteristics at the...

Shape memory polymers (SMPs) are novel materials that revert to their original shape after undergoing a transient deformation in response to an external stimulus. This unique property makes them highly appealing for various applications due to their large flexibility, stretchability, and ability to function in rigorous and corrosive environments. H...

The plasma hydrogenation technique is widely recognized as an efficient tool for modifying graphene’s physical and chemical properties. Therefore, a comprehensive understanding of the interaction between plasma and graphene at the atomic scale can provide valuable insights into the potential applications of graphene. Here, using MD (molecular dynam...

Nanocellulose (NC) as a stable carrier and matrix with high mechanical strength, low thermal expansion, and high electrical resistivity is full of potential to be used in green electronics, energy storage device, and sensors. In this study, a nanocellulose/graphene (NC/G) membrane is designed and successfully prepared in order to modify thermal tra...

Boron shows a variety of properties, determining a chemistry rich and complementary to that of carbon, the neighbor atom in the Periodic Table. In this work, we investigated the strength and nature of the interaction involving B12 or B36 monomer, which represent molecular prototypes of borophene, the two-dimensional allotrope of elemental boron. Fo...

Introducing a second phase has been an effective way to solve the brittleness of boron carbide (B4C) for its application. Though reduced graphene oxide (rGO) is an ideal candidate for reinforcing the B4C duo’s two-dimensional structure and excellent mechanical properties, the toughness is less than 6 MPa·m1/2, or the hardness is lower than 30 GPa i...

The purpose of this study was to analyze the interface condition between graphene and a Si-faced SiC substrate. We evaluated the interface condition by measuring the interface using time-of-flight secondary ion mass spectroscopy. The detected intensities dependence on depth changed depending on the type of carbon molecular ion, indicating that this...

Magnetism of “two-dimensional (2D)-graphene” offers the opportunities for the applications of spintronics. The 2D-graphene material is intrinsically nonmagnetic because the outer-electrons are hexatonic rings and perfectly paired that form s- and p-bonds. To make 2D-graphene as magnetic materials needs to break the symmetric bonds to release the un...

The fast response of H2 sensors plays an important role in the early warning of H2 leakage; in this work, a nanoscale γ-Al2O3 carrier material was prepared using the precipitation method and a new hydrogen sensor was prepared by doping and modifying it with graphene. During the detecting part of the experiment, the voltage–current–temperature detec...

In this work, we investigate systematically the electronic properties and tunable contact behavior of the graphene/γ-GeSe heterostructure under applied electric fields and out-of-plane strains using first-principles calculations. At equilibrium, the heterostructure forms a p-type Schottky contact with low Schottky barrier, making it suitable for lo...

Electric fields can be employed to efficiently manipulate spin textures in low‐dimensional magnetic systems. In this work, the field‐free formation of magnetic skyrmions in ferromagnetic‐based patterned nanodots with perpendicular magnetic anisotropy and Dzyaloshinskii–Moriya interaction via the voltage‐controlled magnetic anisotropy is studied. By...

Aqueous ammonium‐ion batteries (AAIBs) are promising candidates for next‐generation energy storage devices. However, organic materials as suitable anodes face severe challenges due to their structural instability and poor conductivity, which hinder the development of AAIBs. Herein, an innovative approach is introduced by incorporating an organic be...

This paper presents an analytical approach for the nonlinear buckling and postbuckling responses of functionally graded graphene platelets-reinforced composite (FG-GPLRC) complexly curved caps with porous core under uniformly distributed thermal and external pressure resting on the nonlinear elastic foundation using the first-order shear deformatio...

Which functional group shows a stronger affinity for U(VI) and can be introduced into material to enhance selective enrichment? This is crucial for U(VI) capture material design and evaluation. Following these questions, we herein compared and analyzed bare graphene, graphene oxide (GO), and carboxylated graphene oxide (GO-COOH) through experimenta...

The transfer‐free character of graphene growth on Silicon Carbide (SiC) makes it compatible with state‐of‐the‐art Si semiconductor technologies for directly fabricating high‐end electronics. Although significant progress has been achieved in epitaxial growth of graphene on SiC recently, the underlying nucleation mechanism remains elusive. Here, we...

Researchers working with thin samples, such as monolayer graphene, are consistently struggling against contamination. Indeed, the problem of hydrocarbon contamination is known from the earliest days of electron microscopy and efforts to reduce this problem are ubiquitous to almost all high‐vacuum experiments. Accurate knowledge of the behavior of s...

I provide a transfer matrix method for the Foldy-Wouthuysen representation of the Dirac equation. I derive the relationship between the reflection and transmission coefficients of the Dirac spinors and the wavefunction in the transformed representation. I develop a WKB approximation for Dirac fermions that has the same elegant form as the WKB solut...

The importance of gas sensors is apparent as the detection of gases and pollutants is crucial for environmental monitoring and human safety. Gas sensing devices also hold the potential for medical applications as health monitoring and disease diagnostic tools. Gas sensors fabricated from graphene-based fibers present a promising advancement in the...

In this study, we modulate the effective cut-off frequency on the basis of computer simulations of a multilayer dielectric system by increasing the number of layers of the 2D material (graphene or phosphorene) and reducing the thickness of the dielectric, thereby enhancing the frequency. Additionally, another method to modulate the aforementioned e...

By virtue of the abundant oxygen-functional groups, ultra-high specific surface area and superior mechanical properties, graphene oxide (GO) has been proven as one of the outstanding candidates in cement composites. Compared with the traditional cement pastes, the GO-reinforced cement composites exhibit benefits in pore structure, mechanical proper...

Structural superlubricity is a special frictionless contact in which two crystals are in incommensurate arrangement such that relative in‐plane translation is associated with vanishing energy barrier crossing. So far, it has been realized in multilayer graphene and other van der Waals (2D crystals with hexagonal or triangular crystalline symmetries...

This work introduces a novel approach for enhancing mobile audio performance by incorporating graphene-infused terracotta as an acoustic amplifier. Leveraging the high thermal conductivity and mechanical strength of graphene, this study demonstrates the design, fabrication, and acoustic characterization of terracotta amplifiers. We demonstrate the...

Graphene and carbon nanotube (CNT) have been recognized as the new-generation and state-of-the-art nano-reinforcement for polymers, metals, and ceramics as a function of their unique nanostructures, extraordinary mechanical properties, and outstanding multifunctional features. Despite the advantages, however, recently, there have been some concerns...

A fundamental requirement for quantum technologies is the ability to coherently control the interaction between electrons and photons. However, in many scenarios involving the interaction between light and matter, the exchange of linear or angular momentum between electrons and photons is not feasible, a condition known as the dipole approximation...

This study is devoted to the doping of carbon nanomaterials (CNF-graphene) with two dimensions into carbon fiber-reinforced polymers (CFRP) in order to implement the optimization of them in terms of limited mechanical properties and low self-sensing sensitivity. CFRP composites modified with hybrid nanomaterials (CNF-graphene) with three-dimensiona...

We investigate the adsorption of molecular hydrogen on pristine zinc oxide (ZnO) platelets. The volumetric and gravimetric hydrogen storage capacities of the ZnO monolayers are evaluated in a broad range of thermodynamic conditions (i.e., for temperatures in the range 77 K < T < 450 K, and for external gas pressures up to 200 bar). The thermodynami...

Wear problem has become an important issue limiting the functionality and lifetime of sliding electrical contact components. Adding conductive solid lubricants is a potential means of improving the tribological performance of these devices. Graphene, a two-dimensional material with excellent electrical conductivity and lubrication property, has bee...

Amorphous graphene or amorphous monolayer carbon (AMC) is a family of carbon films that exhibit a surprising sensitivity of electronic conductance to morphology. We combine deep learning-enhanced simulation techniques with percolation theory to analyze three morphologically distinct mesoscale AMCs. Our approach avoids the pitfalls of applying perio...

Low‐temperature chemical vapor deposition growth of graphene films is a long‐term pursuit in the graphene synthesis field because of the low energy consumption, short heating‐cooling process and low wrinkle density of as‐obtained films. However, insufficient energy supply at low temperature (below 850 °C) usually leads to the difficulty in carbon s...

Diabetes is speedily developinga grave and life-foreboding illness. It touches 415 million people global and is a primary reason of death amid those matured 20 to 59. It is indispensable to acquire a quick recognition, precise, and sensitive glucose device. In this present research study, we demonstrated highly effective surface plasmon resonance s...

The rapid development of electric vehicles necessitates high‐energy density Li‐ion batteries for extended range. Silicon is a promising alternative to graphite anodes due to its high capacity; however, its substantial volume expansion during cycling leads to continuous growth of the solid electrolyte interphase and significant capacity fading. This...

We study the electron and phonon transport coefficients of graphene disks and rings in the presence of Klein edges. We examine the transport characteristics by changing of the outer and inner radius using the non-equilibrium Green’s function approach. We find that the effect of the nanodisk radius is highly influenced by the Klein edges, such that...

Graphene's exceptional electronic mobility, gate-tunability, and contact transparency with superconducting materials make it ideal for exploring the superconducting proximity effect. However, the work function difference between graphene and superconductors causes unavoidable doping of graphene near contacts, forming a p-n junction in the hole-dope...

Starting from a single layer of NbS2 grown on graphene by molecular beam epitaxy, the single unit cell thick 2D materials Nb5/3S3‐2D and Nb2S3‐2D are created using two different pathways. Either annealing under sulfur‐deficient conditions at progressively higher temperatures or deposition of increasing amounts of Nb at elevated temperature result i...

This paper explores the interplay between quantum information theory and the stabilization of graphene wormholes using external magnetic fields. Utilizing Shannon entropy, we analyze how quantum information can be applied to control and stabilize these structures. By studying graphene’s quantum states under different magnetic field strengths and co...

Herein we report the first successful synthesis of ethanol-assisted in situ generated reduced graphene oxide as a support for CuO/NiO nanoparticles. Through the strategic incorporation of Cu and Ni precursors into ethanol, followed by thermal treatment, we achieved the fabrication of reduced graphene oxide-supported CuO/NiO nanoparticles. The mater...

It has recently been shown that Terahertz sensors can effectively detect the spin resonances of Dirac fermions in graphene. The associated photovoltaic measurement technique allows for the investigation of the intrinsic spin-orbit coupling in graphene as well as its topological properties from microwave to Terahertz frequencies. In this work, using...

At present, the preparation of absorbing materials that combine light weight, ultra-wideband absorption and good thermal insulation performance is still an insurmountable gap. Here, we constructed a three-dimensional porous structure in the hope of obtaining excellent microwave absorption and heat insulation properties. In this paper, a unique thre...

This paper reports power enhancement mode HEMATT diodes optimized for THz switching applications. This has been achieved by introducing Graphene plates in the cathode region of the proposed device. The comprehensive study compares the electrical and electro-optical characteristics of single and 3 × 3 array type device configurations. For the first...

Plasma‐induced methane pyrolysis is a promising hydrogen production method. However, few studies have focused the decomposition of pure methane as a discharge gas. Herein, a rotating gliding arc reactor was used for the conversion of methane (discharge gas and feedstock) into hydrogen and solid carbon. Methane conversion, gaseous product selectivit...

We theoretically study the Goos-Hänchen (GH) and Imbert–Fedorov (IF) shifts of a reflected Gaussian beam from a hyperbolic metasurface composed of graphene grating based on topological insulators (TIs). Perturbations are generated on the surface of TIs by applying a thin magnetic film, resulting in a broken time-reversal symmetry. The GH and IF shi...

A multilayer graphene film with random twist angles between layers (TAGr) on SiC(0001̄) shows six pairs of redox peaks for Li ⁺ insertion/extraction reaction.

In recent years, significant efforts have been dedicated to understanding the growth mechanisms behind the synthesis of vertically aligned nanocarbon structures using plasma-enhanced chemical vapor deposition (PECVD). This study explores how varying synthesis conditions—specifically hydrocarbon flow rate, hydrocarbon type, and plasma power—affect t...

Graphene layers on metals developed by chemical vapor deposition (CVD) possess characteristics of an ideal coating for durable corrosion resistance of industrial infrastructure, by a green approach. However, developing coatings of consistent quality is a challenge and its circumvention requires manipulation of CVD process parameters. The great vari...

The reusable and separable surface frustrated Lewis pairs (SFLPs) open up a novel approach to efficient small‐molecule activation and conversion in heterogeneous catalysis. However, SFLPs have only been reported on limited systems due to the difficulty in the design and synthesis process. The inherent Lewis pairs on various solid materials offer pr...

Magic-angle twisted bilayer graphene (TBG) is a tunable material with remarkably flat energy bands near the Fermi level, leading to fascinating transport properties and correlated states at low temperatures. However, grown pristine samples of this material tend to break up into landscapes of twist-angle domains, strongly influencing the physical pr...

To address the need for efficient separation of ethylene and ethane in the industry, this research employed molecular dynamics simulations using the LAMMPS Software. To explore the effect of pore size on separation, circular holes of varying diameters were created in the BC3 membrane (graphene modified with boron) by removing specific numbers of at...