Materials Literature
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We report an improvement of the optical power and thermal stability of GaN LEDs using a chemically doped graphene transparent conducting layer (TCL) and a low-resistance contact structure. In order to obtain low contact resistance between the TCL and p-GaN surface, a patterned graphene TCL with Cr/Au electrodes is sug…
UNLABELLED: In this work we present a detailed study on the influence of surface modifications for luminescent silver (Ag) clusters. Ag clusters (25 atoms) capped with dihydrolipoic acid show a distinct absorbance spectrum with several sharp transitions, and relative broad deep red luminescence with a quantum yield of…
Abstract Acrylic pressure sensitive adhesives (PSAs) have a range of applications in industry, such as medical products, aircraft, space shuttles, electrical devices, optical products, and automobiles, etc. In this study, acrylic PSAs with fluorinated groups were synthesized using 2,2,2‐trifluoroethyl methacrylate (TF…
We present systematic control of the crystallinity and electrical transport properties of C60 films that are deposited onto pentacene layers, based on simple tuning of the underneath pentacene layer thickness. With increasing the pentacene layer thickness from 0 to 2 monolayers, we observed improvement in crystallinit…
Radial vibration of spherical nanoparticles made of materials with anisotropic elasticity is theoretically investigated using nonlocal continuum mechanics. The anisotropic elastic model is reformulated using the nonlocal differential constitutive relations of Eringen. The nonlocal differential equation of radial motio…
Abstract In this study, five different flexibilizers were added into a matrix resin to improve the flexibility of electrically conductive adhesives ( ECAs ). The flexible ECAs were fabricated from the matrix resin and electrically conductive fillers. Their curing was fixed at 150 °C for 30 min. Of the five flexibilize…
A simple, inexpensive, efficient, and scalable method to create air-stable organic surface passivation layers on silicon using a vapor-phase treatment is demonstrated. A variant of initiated chemical vapor deposition is used to synthesize a thin film that acts as both a passivation layer and an antireflective coating.…
We investigate systematically the competition between the second harmonic generation (SHG) and two-photon-induced luminescence (TPL) that are simultaneously present in Au nanoparticles excited by using a femtosecond (fs) laser. For a large-sized (length ~ 800 nm, diameter ~ 200 nm) Au nanorod, the SHG appears to be mu…
We report thermal conductivity measurements of individual single crystalline Bi2Se3 nano-ribbon (NR) synthesized via the gold nanoparticle catalyzed vapor-liquid-solid mechanism. By using the four-probe third harmonic method, thermal conductivity of Bi2Se3 NRs was obtained in the temperature range of 10 K to 300 K. It…
Modifying the surface of polycrystalline ZnO films using a monolayer of organic molecules with carboxylic acid attachment groups increases the field-effect electron mobility and zero-bias conductivity, resulting in improved transistors and transparent conductors. The improvement is consistent with the passivation of d…
Using many-body diagrammatic perturbation theory we consider carrier density- and substrate-dependent many-body renormalization of doped or gated graphene induced by Coulombic electron-electron interaction effects. We quantitatively calculate the many-body spectral function, the renormalized quasiparticle energy dispe…
The continuous, flexible, and self-supporting nanocomposite films of EuW 10 /PAN (EuW 10 = Na 9 [EuW 10 O 36 ]·32H 2 O; PAN = polyacrylonitrile) have been successfully fabricated through electrospinning technique, and the resulting films display strong red emission of Eu(III) ion. When the films are exposed to acidic…
Carbonyl sulfide (COS) was added to oxygen as the additive etch gas for etching of amorphous carbon layers (ACL), and its effect on the etching characteristics of ACLs as the etch mask for high aspect ratio contact SiO2 etching was investigated. When a 50 nm amorphous carbon hole was etched in a gas mixture of O2 + 5%…
Relative entropy has been shown to provide a principled framework for the selection of coarse-grained potentials. Despite the intellectual appeal of it, its application has been limited by the fact that it requires the solution of an optimization problem with noisy gradients. When using deterministic optimization sche…
The atomic level origin of viscosity and of various relaxation times is of primary interest in the field of supercooled liquids and the glass transition. Previously, by starting from the Green-Kubo expression for viscosity and by decomposing it into correlation functions between local atomic level stresses, we showed…
A large-scale availability of the graphene is critical to the successful application of graphene-based electronic devices. The growth of epitaxial graphene (EG) on insulating silicon carbide (SiC) surfaces has opened a new promising route for large-scale high-quality graphene production. However, two key obstacles to…
Comparative experimental and theoretical studies of an iron-based superconductor and its cobalt-based nonsuperconducting cousin show that increased electronic band filling in the latter leads to much weakened electronic correlations, indicating the importance of the correlations to the superconductivity and a mechanis…
From the analysis of the ratio of D peak intensity to G peak intensity in Raman spectroscopy, electron beam irradiation with energies of 100 eV was found to induce damage in single-layer graphene. The damage becomes larger with decreasing electron beam energy. Internal strain in graphene induced by damage under irradi…
We report the mechanical properties (including intrinsic strength, critical failure strain, and Young's modulus) of bilayer graphene with twist or grain boundaries from first-principles calculations. We find that the intrinsic strength and critical failure strain of a bilayer graphene are governed by the twist angle.…
Abstract Pure and Er‐doped BiFeO 3 nanoparticles were prepared using a sol–gel method. The remanent magnetization was found to increase with increasing Er concentration. Due to the cocontribution of both the ferromagnetic coupling between Er 3+ and Fe 3+ ions and the suppression of spatial spin structure of BiFeO 3 ,…