Dependence Of V2O5 Nanorods Propertis On Substrate Type Prepared By Simple Hydrothermal Method

Vanadium pentoxide (V2O5) nanorods were prepared on various substrates by simple hydrothermal method. The structural characterizations of V2O5 nanorods (NRs) have been studied by using X-ray diffraction analysis. The influence of the different substrates on the surface morphology of V2O5 NRs was investigated by field emission scanning electron microscopy (FESEM) technique. The results show that the preferred orientation along (001) plane. Raman spectra indicate that glass substrate has optimum results due to the size and number of the nanorods with lower defects. It can be found from the absorbance of the glass substrate increases ccompared with the other substrate

Hydrothermal Synthesis and Structural Properties of V2O5 Nanoflowers at Low Temperatures

Vanadium pentoxide nanoflowers were synthesized through a simple hydrothermal method at low temperatures. The structure was fabricated by using NH4VO3 and oxalic acid as precursors with 0.1 M solution concentration. The morphology and structural properties of the nanoflowers were characterized using FESEM, XRD, Raman, and UV-Visible spectroscopy. The results reveal an orthorhombic structure with preferred orientation along (001) plane of the prepared V2O5 nanoflowers. Raman peaks also expressed the same structural features. FESEM images showed the V2O5 nanoflower with diameters in the range of 60-80 nm and length in 600-800 nm. A red-shift was observed in the characteristic absorption peak of V2O5 nanoflowers, which are attributed to the decrease of the bandgap of the samples

ICoFM 2016-58: Influence of Solution Deposition Rate on Properties of V2O5 Thin Films Deposited by spray Pyrolysis Technique

Vanadium oxide (V2O5) thin films were deposited on glass substrates by using a cost-efficient spray pyrolysis technique. The film were grown at 350°C through thermal decomposition VCI3 in deionized water with different solution spray rates. The high resolution X-ray diffraction result revealed the formation of nanocrystalline films having orthorhombic structures with preferential orientation along (101) direction. The spray rate influenced surface morphology and crystallite size of films. The crystallite size was found to increase whereas the micro-strain was decreased by increasing the spray deposition rates. The increase in crystallite size and decrease in the macrostrain resulted in an improvement in the films crystallinity. The UV-Visible spectroscopy analysis indicated that the average transmittance of all films lies in the range 75-80%. The band gap of V2O5 film was decreased from 2.65 to 2.46 eV with increase of the spray deposition rate from 5 ml/min to 10 ml/min

Characteristics Of TiO2-Cu Thin Films Deposited Via Using Electrospray Technique

In this current research, TiO2 thin films were deposited on the cleaning glass substrates via using Electrospray technique. Various deposition Electric potentials were utilized within the scope of 0-5 KV. To understand potential factors affecting TiO2-Cu thin films, the structural, morphological, optical characteristics and the surface chemical composition were explored. The x-ray diffraction peaks showed that all TiO2-Cu samples composed of an anatase phase with average crystallite size of 46 nm. TiO2-Cu films were uniform surface and particle structures such as a spherical size with a thickness of approximately 260 nm. PL spectroscopy was used to analyze the optical properties in order to confirm optical absorption in the visible light field. We provided nanoparticles insights into the enhanced properties of TiO2-Cu thin films under different electric potential. The thin film offers a good performance for use as a biosensor

Fabrication And Characterization Of Light Emitting Diode Based On N-Zno Nanorods Grown Via A Low-Temperature Method On P-GaN

In this work, we report the fabrication of a near-ultraviolet (UV) light emitting (LED) device based on the growth of n-ZnO nanorod (NRs) arrays on the p-GaN layer/sapphire substrate heterostructure using the low-cost hydrothermal technique. Morphological, structural and optical properties of the as-fabricated sample are described. The room temperature current-voltage (I–V) measurements of the fabricated LED device confirmed a rectifying diode behaviour. The device presents near UV color under reverse bias. The luminescence properties of were investigated from both sides of the fabricated LED device at room temperature by electroluminescence (EL). EL spectrum of color emitting LED composed of intense peaks centered at 369 nm, 394 nm and a broad band around green emission. EL emission for the device has seen with the naked eye under normal light

SARS-CoV-2 vaccination modelling for safe surgery to save lives: data from an international prospective cohort study

Background Preoperative SARS-CoV-2 vaccination could support safer elective surgery. Vaccine numbers are limited so this study aimed to inform their prioritization by modelling. Methods The primary outcome was the number needed to vaccinate (NNV) to prevent one COVID-19-related death in 1 year. NNVs were based on postoperative SARS-CoV-2 rates and mortality in an international cohort study (surgical patients), and community SARS-CoV-2 incidence and case fatality data (general population). NNV estimates were stratified by age (18–49, 50–69, 70 or more years) and type of surgery. Best- and worst-case scenarios were used to describe uncertainty. Results NNVs were more favourable in surgical patients than the general population. The most favourable NNVs were in patients aged 70 years or more needing cancer surgery (351; best case 196, worst case 816) or non-cancer surgery (733; best case 407, worst case 1664). Both exceeded the NNV in the general population (1840; best case 1196, worst case 3066). NNVs for surgical patients remained favourable at a range of SARS-CoV-2 incidence rates in sensitivity analysis modelling. Globally, prioritizing preoperative vaccination of patients needing elective surgery ahead of the general population could prevent an additional 58 687 (best case 115 007, worst case 20 177) COVID-19-related deaths in 1 year. Conclusion As global roll out of SARS-CoV-2 vaccination proceeds, patients needing elective surgery should be prioritized ahead of the general population