A growth scheme at a low processing temperature for high crystalline-quality of ZnO nanostructures can be prime stepping stone the future various optoelectronic devices manufactured on transparent plastic substrates. In this study, nanorods (NRs) grown by hydrothermal method 150 °C through doping transition metals (TMs), such as Co, Ni, or Co-plus-Ni, polyethylene terephthalate substrates were investigated surface analysis methods. The TM dopants in NRs suppressed density native...

Vertical integration of two dimensional (2D) layered materials is indispensable in making van der Waals (vdWs) heterostructures for promising electronic and optoelectronic devices. Herein, we report excellent electrical photoelectrical measurements where the current ON & OFF ratio FET increased by decreasing temperature graphene/ReSe2/graphene heterojunction. We investigated photoresponsivity broad spectral range (UV-Vis-NIR) achieved high 1.5 × 107 A W-1 external quantum efficiency ∼64% at...

Solvent extraction followed by adsorption has been found to be one of the competitive processes for recycling waste lubricating oil. In this paper, performance various solvents sludge formation studied. 1-butanol produced maximum methyl ethyl ketone (MEK), 1-hexanol and 2-butanol. The difference in between MEK was only 0.3%. However due low boiling point cost, preferred over 1-butanol. extracted oil then passed through a column different adsorbents. An colour index (yellow) 2, carbon residue...

Recently, many researchers have been paying attention to nanogenerators (NGs) as energy sources for self-powered mirco-nano systems, and studying how achieve their higher power generation. Hence, we propose a hybrid-type NG harvesting both the piezoelectric triboelectric effect simultaneously. In proposed hybrid NG, (PNG) (TENG) are fabricated using polydimethylsiloxane (PDMS) perovskite zinc stannite (ZnSnO3) nanocubes with high charge polarization of 59 uC cm-2 composite (PDMS + ZnSnO3) UV...

As a developing technology for flexible electronic device fabrication, ultra-violet (UV) photodetectors (PDs) based on ZnO nanostructure are an effective approach large-area integration of sensors nonconventional substrates, such as plastic or paper. However, photoconductive nanorods grown substrates have slow responses recovery well low spectral responsivity R because the native defects and inferior crystallinity hydrothermally at temperatures. In this study, nanorod crystallites doped with...

In this study, the ambient condition for as-coated seed layer (SL) annealing at 350 °C is varied from air or nitrogen to vacuum examine evolution of structural and optical properties ZnO nanorods (NRs). The NR crystals high surface density (~240 rods/μm2) aspect ratio (~20.3) show greatly enhanced (002) degree orientation crystalline quality, when grown on SLs annealed in vacuum, compared those ambient. This due vacuum-annealed SL a highly preferred toward large grain sizes. X-ray...

Owing to their intrinsic wide bandgap properties ZnO and GaN materials are widely used for fabricating passive-type visible-blind ultraviolet (UV) photodetectors (PDs). However, most of these PDs have a very low spectral responsivity R, which is not sufficient detecting low-level UV signals. We demonstrate an active type PD with nanorod (NR) structure the floating gate AlGaN/GaN high electron mobility transistor (HEMT), where epitaxial layers isolated by nano-scale fins (NFIs) two different...

We examined the influence of O2 plasma treatment for ZnO seed layer (SL) crystallites on material characteristics nanorods (NRs) synthesized by hydrothermal method. Diode photocurrent and photo-response transient p-Si/n-ZnO-NR heterojunction-based ultraviolet (UV) photodetectors were also according to SLs. The superior optical properties NRs measured from photoluminescence exhibiting 4.6 times greater near-band edge emission when grown O2-plasma-treated SL. degree (002) orientation NR...

In this study, we investigated the effect of gate length and surface area ZnO ultraviolet (UV) absorbing structure on transient characteristics AlGaN/GaN HEMT based UV photodetectors. The gate-areas (2, 6 18 μm lengths with same width 100 μm) HEMTs are covered thin film nanorods (NR) separately. fabricated devices show enhancement in response speed reduction or increase area. best ∼10 ms time ∼190 recovery is measured from NR-gated device a 2 μm. A model for oxygen desorption kinetics...

F. Khan, P. Yue, L. Rizzuti, V. Augugliaro and M. Schiavello, J. Chem. Soc., Commun., 1981, 1049 DOI: 10.1039/C39810001049

Abstract A number of metals are found in used lubricating oil. In this article, performance solvent extraction followed by adsorption on magnesite has been studied for removal from The suggested process is one the efficient methods to remove not only sludge, but also either present oil as additives or picked up during its working life. re-refined metal content comparable with base some cases, even lower observed.

We demonstrate an improvement in the photoresponse characteristics of ultraviolet (UV) photodetectors (PDs) using N2O plasma-treated ZnO nanorod (NR) gated AlGaN/GaN high electron mobility transistor (HEMT) structure. The PDs fabricated with NRs for 6 min show superior performance terms responsivity (∼1.54×10 5 A/W), specific detectivity (∼ 4.7×1013 cm·Hz-1/2/W), and on/off current ratio (∼40). These improved parameters are best among those from HEMT-based reported to date. Photoluminescence...

The effect of annealing temperatures on the surface morphology and optical properties titanium dioxide (TiO2) thin films deposited by spin coating Silicon substrate was studied. TiO2 onto silicon substrates were annealed at different temperatures. structural studied using scanning electron microscopy (SEM), X-ray diffraction technique (XRD) ellipsometer. results indicated that changed with increase in temperature. SEM investigation showed as temperature increased, grain pores size increased....

A selective and mild (55 °C 50 psig) homogeneous oxidation system has been described to produce hydroperoxides from a narrow cut made typical gas oil. During this process oil, dissolved in wet acetic acid, is treated with air the presence of redox couple Co(III)/Co(II) (partially oxidized catalyst, POC). straightforward route POC consists oxidizing Co(II) acid calculated aqueous potassium chlorate. Initiation manifestation potent ability Co(III) toward generating alkyl radicals hydrocarbons...

Abstract Raw magnesite is slightly porous but its porosity could be increased on heating at and above 500°C. Its adsorption characteristics were investigated for various activation temperatures, times particle sizes. Maximum capacity was found 100–230-mesh particles activated 500°C 2 h. This has produced low color index re-refined oil. One of the economical features reproducibility results after regeneration spent samples. An excellent feature adsorbent efficient removal capability aromatics...

Abstract Printing techniques have been widely adopted in the fabrication of flexible electronic components. However, its application is still limited complex control and communication circuitry due to low performance uniformity amongst printed devices, compared conventional electronics. Thus, systems real-world applications are hybrid integrations Here we demonstrate a low-cost, low-complexity, fully-printable photodetector that can withstand over 100 1 mm-radius bending cycles using simple...

In this study, we observe the effect of Cu doping on ZnO nanorod (NR) structure grown a polyethylene terephthalate flexible substrates by hydrothermal growth sol–gel method proceeded at 150 °C. Copper (II) nitrate trihydrate (Cu-nitrate) and copper acetate monohydrate (Cu-acetate) are employed as precursors for dopants in aqueous solution to examine evolutionary change morphology, optical characteristics, chemical composition as-grown NRs. A significant influence dopant molarity morphology...

Central composite design methodology has been employed to model the sludge yield data obtained during liquid-liquid extractive rerefining of spent lubricants using an alcohol (1-butanol) and a ketone (methyl ethyl ketone) as prospective solvents. The study resulted in two reasonably accurate multivariate process models that relate (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Homogeneous production of hydroperoxides concentrate has been simulated via multivariate calibration yield data, obtained during an earlier study [Naqvi and Khan Ind. Eng. Chem. Res. 2009, 48, 5642] made on the air oxidation diluted gas oils in presence chemically generated redox couple Co(III)/Co(II). Principal component analysis applied to abstract dynamic data that provides basis for simulation. A novel chemometric technique, inverse nonlinear principal regression, introduced simulate...