Hydrothermal zinc oxide (ZnO) thick films were successfully grown on the chemical vapor deposition (CVD)-grown ZnO seed layers a-plane sapphire substrates using aqueous solution of nitrate dehydrate (Zn(NO3)2). The use CVD with flat surfaces seems to be a key technique for obtaining instead vertically aligned nanostructures as reported in many literatures. All hydrothermal showed large grains hexagonal end facets and highly oriented towards c-axis direction. Photoluminescence (PL) spectra...

The formation of high-density zinc oxide (ZnO) nanorods on porous silicon (PS) substrates at growth temperatures 600–1000 °C by a simple thermal evaporation (Zn) powder in the presence oxygen (O2) gas was systematically investigated. ZnO with (0002) orientation over large area attributed to rough surface PS, which provides appropriate planes promote deposition Zn or ZnOx seeds as nucleation sites for subsequent nanorods. geometrical morphologies are determined seed structures, i.e., cluster...

Pure zinc oxide and oxide/barium carbonate nanoparticles (ZnO-NPs ZB-NPs) were synthesized by the sol–gel method. The prepared powders characterized X-ray diffraction (XRD), ultraviolet–visible (UV–Vis), Auger spectroscopy, transmission electron microscopy (TEM). XRD result showed that ZnO BaCO3 nanocrystals grow independently. spectroscopy proved existence of carbon in composites besides Zn, Ba, O elements. UV–Vis results absorption edge is redshifted adding barium carbonate. In addition,...

We report three cases of rickettsial infections diagnosed by performing a multiplex molecular syndromic panel, in patients who presented with undifferentiated tropical fever non-specific clinical signs and symptoms. All were from regions endemic to agents fever, such as dengue leptospirosis, typhoid which considered differential diagnoses the initial investigative workup. These highlight need for rapid diagnostic approach enable timely diagnosis institution appropriate antibiotic therapy,...

The sensing responses in aqueous solution of an open-gated pH sensor fabricated on AlGaN/GaN high-electron-mobility-transistor (HEMT) structure are investigated. Under air-exposed ambient conditions, the undoped HEMT only shows presence a linear current region. This seems to show that very low Fermi level pinning by surface states exists sample. In solution, typical current-voltage (I-V) characteristics with reasonably good gate controllability observed, showing potential AlGaN at area is...

We report the seed/catalyst-free vertical growth of high-density electrodeposited ZnO nanostructures on a single-layer graphene. The absence hexamethylenetetramine (HMTA) and heat has resulted in formation nanoflake-like structure. results show that HMTA are needed to promote hexagonal nanostructures. applied current density plays important role inducing graphene as well controlling shape, size, High vertically aligned nanorods comparable other methods was obtained. quality also depended...

We report a synthesis of β-Ga2O3 nanostructures on Si substrate by electrochemical deposition using mixture Ga2O3, HCl, NH4OH, and H2O. The presence Ga3+ ions contributed to the Ga2O3 surface with assistance applied potentials. morphologies grown structures strongly depended molarity pH level electrolyte. nanodot-like were at condition low Ga2O3. However, nanodot covered nanorods top their surfaces obtained higher molarity, densities seem increase decrease level. High concentration OH- may...

We report a viable method to produce nanocrystalline graphene films on polycrystalline nickel (Ni) with enhanced N doping at low temperatures by cold-wall plasma-assisted chemical vapor deposition (CVD) method. The growth of was carried out in benzene/ammonia/argon (C6H6/NH3/Ar) system, which the temperature substrate heated Joule heating can be further lowered 100 °C achieve sheet resistance 3.3 kΩ sq–1 high optical transmittance 97.2%. morphological, structural, and electrical properties...

We propose two designed systems consist of series micro ring resonator (MRR) and an add/drop multiplexer in which the optical dark bright soliton pulse propagating within nonlinear waveguides can be amplified used long communication system. The or is input into travels waveguide. A continuous sliced smaller pulses by effect known as chaos. In this way large bandwidth signals obtained. power amplification occurs when propagates along MRRs systems. system itself to amplify at drop part work we...

We present a new concept of ASK‐to‐PSK generation based on nonlinear microring resonators coupled to one MZI arm by using OptiWave FDTD method. By resonator increase from three (SR TR), we found that the amplitude shift keying (ASK) are exactly and phase (PSK) is equal π.

A system for continuous variable quantum key distribution via a wavelength router is proposed. The Kerr type of light in the nonlinear microring resonator (NMRR) induces chaotic behavior. In this proposed signals are generated by an optical soliton or Gaussian pulse within NMRR system. parameters, such as input power, MRRs radii and coupling coefficients can change plays important role determining results which spreading over spectrum. Large bandwidth propagating MRRs, allowed to form...

A chemically doped graphene-based three-branch nanojunction device is fabricated on a SiO2/p-Si substrate, and its nonlinear operation characterized at room temperature (RT). By polyethyleneimine doping, the shows improved field effect mobility of 14 800 16 100 cm2/Vs for electron holes, respectively. The clearly exhibits nonlinearity in voltage transfer curves RT. curvature curve can be controlled by using back gate voltage, polarity abruptly switches near Dirac point because carrier type...

The electrochemical growth of zinc oxide (ZnO) nanostructures on graphene glass using nitrate hexahydrate was studied. effects current densities and temperatures the morphological, structural, optical properties ZnO structures were Vertically aligned nanorods obtained at a low temperature 75°C, diameters increased with density. Growth seems to have strong effect in generating well-defined hexagonal-shape smooth top edge surface. A film-like structure observed for high above -1.0 mA/cm(2)...

A seedless growth of zinc oxide (ZnO) structures on multilayer (ML) graphene by electrochemical deposition without any pre-deposited ZnO seed layer or metal catalyst was studied. high density a mixture vertically aligned/non-aligned rods and flower-shaped obtained. ML seems to generate the formation due stacking boundaries. The nucleation be promoted at edges with increase applied current density, resulting in structures. diameters rods/flower-shaped also density. aspect ratio over 5.0 good...