Materials Literature
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We report the characterization of GaN high electron mobility transistors (HEMTs) using a new AlN-capped AlInN/GaN epilayer structure developed to achieve high current densities and reduced gate leakage currents. Devices with gate lengths of 75 and 200 nm and various and source–drain separations were fabricated simulta…
Selection rules and interference effects in angle-resolved photoemission spectra (ARPES) from twisted graphene bilayers are studied within a long-wavelength theory for the electronic structure. Using a generic model for the interlayer coupling, we identify features in the calculated ARPES momentum distributions that a…
The purpose of this study was to improve the properties of epoxy resin using titanium oxide nanoparticles. The effects of particle weight fraction, dispersion agent, and curing agents with different molecular weights on the thermal and mechanical properties of titanium-oxide-reinforced epoxy resin were investigated. I…
A new approach to develop novel non‐viral vector for HIV inhibition based on carbosilane dendrimers is described. Cationic ammonium‐terminated carbosilane dendrimers have been synthesized via alcoholysis of dendritic Si‐Cl bonds or hydrosylilation reactions with dendritic Si‐H bonds. Ammonium‐terminated carbosilane de…
ROBINA FAROOQ*, MEHWISH DURRANI, ZAKI AHMED, MAZHAR AMJAD GILANI, QAISAR MAHMOOD, SALEEM FAROOQ SHAUKAT, NNAJI CHIOMA, MUHAMMAD FAROOQ AND ASIM YAQUOB Department of Chemical Engineering, COMSATS Institute of Information Technology, Lahore Pakistan. Department of Environmental Sciences, COMSATS Institute of Information…
The thermal decomposition of c-plane GaN/sapphire templates was studied in a metalorganic vapor phase epitaxy (MOVPE) system installed in a laboratory-level X-ray diffractometer by using in situ X-ray reflectivity (XRR). GaN remained thermally stable in pure N2 up to 900 °C, while a significant decomposition occurred…
This feature offers 11 papers in the field of optical ceramics, and encompasses advances in optics, materials science, condensed matter, as well as physics and chemistry relevant to the development of new optical materials. Topics covered include material technologies in the field of polycrystalline ceramics, single c…
As software and methodology develop, key aspects of molecular interactions such as detailed energetics and flexibility are continuously better represented in docking simulations. In the latest iteration of the XPairIt API and Docking Protocol, we perform a blind dock of a peptide into the cleavage site of the Anthrax…
"My greatest achievement has been to combine being a teacher, a researcher, and a popularizer of science for over 50 years. My worst nightmare is to find myself dumbstruck when I am about to give a lecture …︁" This and more about Sir John Meurig Thomas can be found on page 10938.
We investigate the impacts of quantum-well (QW) shapes on the performance of InGaN/GaN light-emitting diodes (LEDs) grown on c-plane sapphire substrates. Three different QW shapes are utilized, namely, rectangular, staircase, and trapezoidal QWs of thicknesses of 4, 5, and 6 nm. Various optoelectronic measurements are…
Abstract The carrier dynamics of a Ga(AsBi)/GaAs single quantum well (SQW) with a Bi content of 5.5% are studied by means of time‐resolved photoluminescence (PL). Random fluctuation of the alloy compositions and the presence of Bi clusters in the QW material, lead to localized states and have a significant influence o…
A Fischer-mans friend: The nanostructuring of iron and cobalt oxides with core–shell structures through rational design allows the development of a synthetic approach to a very efficient, cost-effective, scalable, and selective catalyst for Fischer–Tropsch synthesis and for the conversion of syngas into liquid fuel.
One of the modern problems, arising in the detection and identification of substances, is a development of criteria for the assessment of a presence of explosive (or other dangerous substance) fingerprints in investigating THz signals reflected from a sample. Obviously, criteria depend on using method for the detectio…
The growth of InGaN with intermediate In compositions on GaN/sapphire template and AlN/Si(111) substrate has been comparatively studied. By using an metalorganic vapor phase epitaxy (MOVPE) system with a horizontal reactor, InGaN films are grown at a temperature of 600–800 °C in the pressure of 150 Torr. By optimizing…
Surface enhanced Raman spectroscopy (SERS) is a highly sensitive sensing technique, offering sensitivity comparable to that of fluorescence while providing structure-dependent analyte information. In recent years, we have developed an innovative optofluidic SERS substrate by inkjet printing metal nanoparticles onto pa…
We derive, from the dimensional-crossover criterion, a fundamental-measure density functional for parallel hard curved rectangles moving on a cylindrical surface. We derive it from the density functional of circular arcs of length σ with centers of mass located on an external circumference of radius R(0). The latter f…
This work summarizes the output of durability, reaction to fire properties, and environmental impact of wooden claddings subjected to treatments modified with TiO2 and clay nanoparticles. The objective was to investigate the effects of 1 wt% of TiO2 and clay nanoparticles in existing water-based and stain coatings and…
A single-crystalline sample of the tetragonal rare-earth ferromagnet CeRu2Al2B has been grown and its magnetization measurements have been performed. The highly anisotropic magnetic susceptibilities with the \(c\)-axis being the magnetic easy axis can be explained by considering the \(4f\) levels with the Γ\(_{7}^{(1)…
We have performed photoluminescence (PL) measurements for green–yellow InGaN/GaN multiple quantum wells (MQWs) in which InGaN layer was embedded in the barrier layer to verify the effect on the crystal quality and the internal electric field (F0). From the analysis of both the time-resolved PL and the excitation-power…
Various multiple quantum well structures with three main geometries of triangular, isosceles trapezoidal, and right-angled trapezoidal shape have been designed and fabricated on 4-in. sapphire substrates by metal organic vapor phase epitaxy. Photoluminescence measurements reveal the influence of the quantum well struc…