Magnetite−graphene hybrids have been synthesized via a chemical reaction with magnetite particle size of ∼10 nm. The composites are superparamagnetic at room temperature and can be separated by an external magnetic field. As compared to bare particles, the show high binding capacity for As(III) As(V), whose presence in drinking water wide areas South Asia has huge problem. Their is due increased adsorption sites M−RGO composite which occurs reducing aggregation magnetite. Since near complete...

We fabricated a highly oxidized large-scale graphene platform using chemical vapor deposition (CVD) and UV/ozone-based oxidation methods. This offers surface-enhanced Raman scattering (SERS) substrate with large enhancement in SERS reproducible signals over centimeter-scale surface. After UV-induced ozone generation, molecules were reacted to produce oxygen-containing groups on induced the p-type doping of graphene. These modifications introduced structural disorder defects surface resulted...

Organic electronic devices that use graphene electrodes have received considerable attention because is regarded as an ideal candidate electrode material. Transfer and lithographic processes during fabrication of patterned typically leave polymer residues on the surfaces. However, impact these organic semiconductor growth mechanism surface has not been reported yet. Here, we demonstrate remaining surfaces induce a stand-up orientation pentacene, thereby controlling pentacene such molecular...

We have devised a method to optimize the performance of organic field-effect transistors (OFETs) by controlling work functions graphene electrodes functionalizing surface SiO2 substrates with self-assembled monolayers (SAMs). The electron-donating NH2-terminated SAMs induce strong n-doping in graphene, whereas CH3-terminated neutralize p-doping induced substrates, resulting considerable changes electrodes. This approach was successfully utilized electrical properties and electronic devices...

Dual doping-driven perpendicular electric field with opposite directions remarkably increase the on/off current ratio of bilayer graphene field-effect transistors. This unambiguously proves that it is possible to open a bandgap two molecular dopants (F4-TCNQ and NH2-functionalized self-assembled monolayers (SAMs)) even in single-gate device structure. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or...

Transparent, flexible carbon-based pentacene field-effect transistors (FETs) were successfully fabricated from monolayer graphene electrodes on plastic substrates. One-atom-thick provides an ideal material for source/drain efficient charge injection and transport, resulting in low contact resistance between the films. Thus, FETs with patterned exhibit significantly higher performances than those of common metal electrodes. Detailed facts importance to specialist readers are published as...

A directed-assembly method on the basis of graphene oxide (GO) pieces is developed, which allowed us to mass-produce a uniform array graphene-based ambipolar memory devices using only conventional microfabrication facilities. Significantly, we successfully demonstrated that this device can be operated as both conductivity-switching and new type-switching by adjusting charge density nanoparticles.

Hydrophobic self-assembled monolayers (SAMs) with alkyl chains of various lengths were inserted between CVD-grown graphene layers and their SiO2 substrates (figure). As the SAM chain length increased, substrate-induced doping was suppressed by ordered close-packed structure SAMs long chains. Accordingly, transistors constructed on exhibited higher electron/hole mobilities lower Dirac point voltages. Graphene has received considerable attention as a potential alternative material for use in...

The resonance effects on the Raman spectra from 5 to 900 cm(-1) of few-layered MoS2 thin films up 14-layers were investigated by using six excitation energies. For main first-order peaks, intensity maximum occurs at ∼2.8 eV for single layered and ∼2.5 MoS2, which correspond band-gap energy. At energy 1.96 eV, several anomalous behaviors are observed. Many second-order peaks anomalously enhanced even though not enhanced. In low-frequency region (<100 cm(-1)), a broad peak centered ∼38 its...

Lithium–sulfur (Li–S) batteries are expected to overcome the limit of current energy storage devices by delivering high specific with low material cost. However, potential Li–S has not yet been realized because several technical barriers. Poor electrochemical performance is mainly attributed electrical conductivity fully charged and discharged species, irreversible loss polysulfide anions decrease in number electrochemically active reaction sites during battery operation. Here, we report...

Chemical doping can decrease sheet resistance of graphene while maintaining its high transparency. We report a new method to simultaneously transfer and dope chemical vapor deposition grown onto target substrate using fluoropolymer as both the supporting layer. Solvent was used remove significant fraction fluoropolymer, but residual polymer remained that doped significantly. This contrasts with more widely layer, polymethylmethacrylate, which does not induce during transfer. The mechanism be...

Abstract Layered materials such as graphite and transition metal dichalcogenides have extremely anisotropic mechanical properties owing to orders of magnitude difference between in-plane out-of-plane interatomic interaction strengths. Although effects perturbations on either intralayer or interlayer interactions been extensively investigated, mutual correlations them rarely addressed. Here, we show that layered an inevitable coupling uniaxial strain shear. Because this, the induces anomalous...

Graphene placed on hexagonal-boron nitride (h-BN) experiences a superlattice (Moiré) potential, which leads to strong reconstruction of graphene's electronic spectrum with new Dirac points emerging at sub-eV energies. Here we study the effect such superlattices Raman spectrum. In particular, 2D peak is found be exquisitely sensitive misalignment between graphene and h-BN lattices, probably due presence strain distribution same periodicity Moiré potential. This feature can used identify angle...

We report the observation of coherent lattice vibrations in mono- and few-layer WSe2 time domain, which were obtained by performing time-resolved transmission measurements. Upon excitation ultrashort pulses with energy resonant to that A excitons, oscillations A1g optical phonon longitudinal acoustic at M point Brillouin zone (LA(M)) impulsively generated monolayer WSe2. In multilayer flakes, interlayer breathing mode (B1) is found be sensitive number layers, demonstrating its usefulness...

Doping is an essential process to engineer the conductivity and work-function of graphene for higher performance optoelectronic devices, which includes substitutional atomic doping by reactive gases, electrical/electrochemical gate bias, chemical acids or reducing/oxidizing agents. Among these, has been widely used due its simple high strength. However, it also instability problem in that molecular dopants tend gradually evaporate from surface graphene, leading substantial decrease effect...

Selective n-type doping of graphene is developed by utilizing patternable gold nanoparticles functionalized with photoreactive cinnamate moieties. The can be regularly patterned on the UV-induced cross-linking cinnamate, which provides a convenient method to control optical and electrical properties site-specifically. strong covered was confirmed Raman, X-ray photoelectron spectroscopy, electron transport measurements. We believe that our would find numerous applications in area...

Abstract Inelastic electron tunneling spectroscopy is a powerful technique for investigating lattice dynamics of nanoscale systems including graphene and small molecules, but establishing stable tunnel junction considered as major hurdle in expanding the scope experiments. Hexagonal boron nitride pivotal component two-dimensional Van der Waals heterostructures high-quality insulating material due to its large energy gap chemical-mechanical stability. Here we present planar graphene/ h...

Dielectric aging of Mn and V-codoped BaTiO3 was investigated. The increase V concentration had little influence on aging, whereas that increased it. Thermally stimulated depolarization current (TSDC) low specimen showed one peak, Mn-increased two peaks. first second peak is supposed to be caused by the phase transition undoped core region defect dipole such as MnTi″-VO•• or MnTi′-VO••, respectively. High TSDC associated with significant rate experimentally demonstrates dielectric controlled dipole.

Globally, energy standards for new buildings are being reinforced to improve efficiency, and remodeling policies promoted old buildings. The South Korean Government is promoting green projects, focusing on research product development the performance of windows curtain walls. In line with this, present study proposes two methods using polymer dispersed liquid crystal (PDLC) films, which can adjust solar radiation office addition, efficiency improvement daylight according were analyzed....

The atomic configuration of graphene edges significantly influences the various properties nanostructures, and realistic device fabrication requires precise engineering edges. However, imaging analysis intrinsic nature can be illusive due to contamination problems measurement-induced structural changes In this issue ACS Nano, He et al. report an in situ heating experiment aberration-corrected transmission electron microscopy elucidate temperature dependence edge termination at scale. They...

Utilizing van der Waals heterostructure gas sensors, we measure the rectification behavior of sensitivity signal and devise a fingerprint map variation in mixture condition two different molecules.

Acoustic cavitation and tissue deformation are studied by modifying a level-set method for compressible two-phase flows to consider viscoelastic deformation. The numerical simulations performed using different shear moduli bubble-tissue distances demonstrate various interactions between bubble tissue, including inverted cone-shape bubbles, migration, liquid jet formation, compressive expansive deformation, perforation. is observed grow larger with increasing bulk modulus density. maximum...

Metallic catalysts have emerged as prominent materials for graphene growth because the choice of substrate significantly influences properties graphene. Among metallic catalysts, Cu is a highly promising catalytic it facilitates monolayer However, process often induces strain and structural deformations that affect electronic device performance In this study, we present first observation micropatterned domains in grown on substrates using chemical vapor deposition. Distinct strain‐induced...