Khizar Hayat

University of Peshawar · Department of Physics

Silver nanoparticles (Ag-NPs) were synthesized by using the polyol method. The structural and morphological characteristics of Ag-NPs were studied by using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM). The XRD analysis revealed the formation of single-phase polycrystalline Ag-NPs with an average crystallite size...

In this article we report magnetite (Fe3O4) nanoparticles prepared via hydrothermal technique at different reaction time and precursor's concentration. X-ray diffraction (XRD) result shows the formation of single phase iron oxide that matches well with standard JCPDS card #: 01-079-0418. Excellent crystallinity was achieved for octahedral shape par...

This study uses computational analysis to comprehensively investigate lead‐free organic–inorganic CH3NH3SnI3 (MASnI3)‐based perovskite solar cells (PSCs). The optoelectronic properties of MASnI3 are investigated using density functional theory with first‐principles calculations, highlighting its potential for photovoltaic applications. Key findings...

A facile wet-chemical assisted synthesis route is adapted to prepare a novel SnO 2 /SnSe nanocomposite for the time to construct an aqueous asymmetric hybrid supercapacitor (AAHSC). The detailed characterization reveals the appropriate formation of micro flower-like SnO 2-SnSe nanocomposite-covered with SnSe network to provide a conductive support...

ZnO-based Inverted Organic Solar Cells (OSCs) were simulated using the Solar Cell Capacitance Simulator (SCAPS-1D) software. Two different device architectures were employed: single-layer (SL) and trilayer (TL) configurations. In the SL-OSCs, the structure consisted of a P3HT/PCBM blend between ZnO and molybdenum oxide (MoO 3 ) layers. The P3HT/PCB...

Vertically aligned zinc oxide nanorod (ZnO-NR) growth was achieved through a wet chemical route over a comb-shaped working area of an interdigitated Ag–Pd alloy signal electrode.

Due to its advantageous chemical stability, low cost, and extensive porosity, activated carbons (AC) are a crucial material in many industries. The AC precursors, synthetic pathways, activating agents, and synthesis parameters are crucial elements for the best synthesis of AC. Using waste biomass as a precursor for AC has recently increased since i...

Arsenic (As3+) is the most carcinogenic and abundantly available heavy metal present in the environment. Vertically aligned ZnO nanorod (ZnO-NR) growth was achieved on metallic nickel foam substrate via a wet chemical route and it was used as an electrochemical sensor towards As(iii) detection in polluted water. Crystal structure confirmation, surf...

In this study, Li2WO4 (LW) was used as an additive to lower the sintering temperature of BaTiO3 (BT) ceramics using the formulation (1−x)BT–xLW (x = 0.0, 0.01, 0.05, 0.1), via a solid-state reaction route. The additive was effective in lowering the sintering temperature of BT from 1350 to 1150 °C. At x = 0 and 0.01, a single-phase tetragonal perovs...

This article reports the simulation of ZnO-based polymer solar cell (PSC) device parameters. The Solar Cell Capacitance Simulator (SCAPS-1D) software was used to analyze the cell parameters. Two different device configurations of PSCs were simulated with ZnO (an inverted device) and without ZnO (a reference device). The important device processing...

P3HT/PCBM-based polymer solar cells (PSCs) were fabricated using conventional and inverted device architectures. Conventional PSCs were annealed at various temperatures ranging from room temperature (RT) to 180°C. At 130°C, the PSC exhibited enhanced device performance with efficiency of 2.64%. PSCs with oxide (TiO2/ZnO) interlayers were found to p...

The present study portrays the synthesis of ZnO/MnO2-based nanocomposite with different weight percentages of MnO2 (10 % and 40 %, signifies as ZM-1 and ZM-4), and their morphological-dependent electrochemical performance has been demonstrated. The morphological study was explored using SEM analysis which showed that the ZnO and MnO2 reflected the...

The present study portrays the synthesis of ZnO/MnO2-based nanocomposite with different weight percentages of MnO2 (10% and 40%, signifies as ZM-1 and ZM-4), and their morphological-dependent electrochemical performance has been demonstrated. The morphological study was explored using SEM analysis which showed that the ZnO and MnO2 reflected the na...

Simulation and experimental analysis of TiO2 based organic solar cells (OSCs) using the Solar Cell Capacitance Simulator is presented herein. The OSCs were simulated in two different device configurations, i.e., with TiO2 (inverted device) and without a TiO2 interlayer (reference device). Secondly, the simulation analysis of OSCs was compared with...

A facile, single-step hydrothermal route is followed to prepare ZnS nanowires with large aspect ratios. The obtained ZnS nanowires deposited on nickel foam (ZnS/Ni-foam) exhibit a specific capacitance of 781 F/g at a current density of 0.5 A/g. An asymmetric supercapacitor fabricated from ZnS/Ni-foam as a positive electrode and jute derived activat...

Single-phase La 1-x Sr x CoO 3 (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.1) nanofibers were synthesized via electrospinning technique. Different characterization techniques were employed to characterize the electrospun nanofibers. SEM was used to observe the morphology and size of the electrospun nanofibers, and the diameter of all fabricated nanofiber...

Europium doped phosphate glasses (KPEu) with various concentrations of Eu2O3 were prepared by a melt-quenching method for red light application. The prepared samples were characterized using physical, absorption, photoluminescence, X-ray induced luminescence (XEL) and J-O analysis techniques. Density, molar volume and refractive index of the invest...

Single-phase lead-zirconate-titanate (PZT) perovskite nanofibers, with PbZr0.5Ti0.5O3 composition were synthesized using the electrospinning technique. Poly-vinyl-pyrrolidone (PVP) was used as viscosity controller, size and uniformity of the PbZr0.5Ti0.5O3 nanofibers were optimized against different PVP concentrations. The results showed that PVP c...

Bismuth borate glasses containing lithium and gadolinium were doped with (0.1–2.5 mol%) of Ce and their optical and radiation response were investigated. These modified glasses exhibited photoluminescent properties in response to the radiations, which were evidenced by their broad-band spectral features around 378 nm due to 5d→4f transitions of the...

A novel approach to enhance the solar cell efficiency via employing a luminescent downshifting mechanism is presented in this work. Gold metal ions were diffused into a commercially available sodalime silicate glass using a versatile field-assisted solid-state ion diffusion technique under different experimental conditions. Some of these samples we...

We report inverted bulk heterojunction organic solar cells (OSCs) by incorporating TiO 2 as electron extracting layer. TiO 2 was synthesized via sol-gel method. Solar cell's active layers (P3HT/PCBM blend) were deposited using low and high spin casting of 1000 rpm (20 s) and 2000 rpm (60 s) respectively. The film deposited with 1000 rpm was kept ov...

We report the fabrication of solid-state dye-sensitized solar cells (ss-DSSCs), using a metal-free organic dye (D102) as a sensitizer. Mesoporous TiO2 acting as a photoanode, is prepared from TiO2 nanopaste followed by drafting light-absorbing dye molecules. Spiro-OMeTAD is used as a hole transport material (HTM), which has a potential role in the...

Lanthanum manganites are being constantly investigated for their interesting magnetic and transport properties. In this study, polycrystalline, single phase lanthanum manganite (LaMnO3) nanofibers were synthesized using an electrospinning technique, and characterized in terms of phase, microstructure, ac and dc electrical properties. X-ray diffract...

Single phase polycrystalline BaMn1−x A x O3 (x = 0.01, A = Ru, Fe and Nb) ceramics samples with a rhombohedral (15R) $R\bar{3}m$ symmetry were prepared via a conventional solid-state sintering route. The microstructure of all the samples was porous, and the substitutions at B-site did not affect the microstructure of these ceramics. Undoped BaMnO3...

Single phase polycrystalline BaMn1-xAxO3 (x = 0.01, A = Ru, Fe and Nb) ceramics samples with a rhombohedral (15R) symmetry were prepared via a conventional solid-state sintering route. The microstructure of all the samples was porous, and the substitutions at B-site did not affect the microstructure of these ceramics. Undoped BaMnO3 ceramics exhibi...

In this study, we present the synthesis of nickel oxide nanofibers through electrospinning technique at optimum processing and heat treatment conditions. The diameter and uniformity of electro-spun nickel oxide nanofibers were investigated as a function of PVP concentration. Uniform and homogeneous composite nanofibers were observed for PVP:Ni(CH3C...

Nickel oxide nanofibers were synthesized using an electrospinning technique. X-ray diffraction revealed the formation of single phase polycrystalline NiO nanofibers when calcined at 600 °C. Scanning electron microscopy demonstrated that the average diameter of composite nanofibers dried at 100 °C was ∼400 nm, which decreased to ∼100 nm for samples...

In this work, two tissue equivalent dosimeters i.e. LiF: Mg, Ti and LiF: Mg, Dy with the same concentration of Mg were synthesized by a chemical co-precipitation method. The crystallite size determined using Sherrer's formula ranged from 30 nm to 35 nm. The absorbance spectra revealed the presence of stretching vibrations of oxides of titanium and...

Mg- and Dy co-doped LiF nanophosphors were fabricated using a chemical co-precipitation method and characterized for their application potential as thermoluminescent (TL) and photoluminescent (PL) dosimeters. X-ray diffraction revealed the formation of almost single phase cubic LiF:Mg, Dy with an average crystallite size of ∼35 nm. The TL glow curv...

A relatively easier and more accurate method for the determination of average size of metal nanoparticles/aggregates in silicate glasses based on ultraviolet visible (UV–Vis) spectra fitted with the Mie and Mie–Gans models was reported. Gold ions were diffused into sodalime silicate and borosilicate glasses by field-assisted solid-state ion-exchang...

Thermoelectric and humidity sensing characteristics of single phase La2CuO4 (LCO) nanofibers were investigated. LCO nanofibers-based devices were fabricated and characterized for their possible use in thermoelectric and humidity sensing applications. The Seebeck coefficient (S) of the fabricated device increased linearly from ∼30 (at 298 K) to 300...

The main objective of this study was to investigate the effect of dopants on the optical properties of sodalime silicate glasses. Consequently, gold and chromium ions were incorporated in the glass matrix via field-aided diffusion for the enhancement of optical properties. The subsequent structural modifications were investigated using secondary io...

Decreasing the sintering temperature of BaTiO3 without deteriorating the dielectric properties is technologically important in the fabrication of multi-layer ceramic capacitors (MLCCs). Consequently, ceramic formulations based on the (1 − x)BaTiO3–xLi3PO4 (x = 0, 0.01, 0.03, 0.05, and 0.1) were prepared. The use of Li3PO4 as a sintering aid lowered...

Barium manganite nanofibers were synthesized using electrospinning technique. X-ray diffraction revealed the formation of single phase BaMnO3 nanofibers. Scanning electron microscopy revealed the formation of uniform composite and porous BaMnO3 nanofibers with an average diameter of ∼130 nm and <100 nm at 100 °C and 600 °C, respectively. Temperatur...

The Co0.6Sn0.4Fe2O4 nanoparticles with 20-nm size were prepared by chemical coprecipitation method. The material exhibits wasp-waist type M(H) loop at lower temperatures (below 360 K) that has been attributed to the simultaneous existence of double-exchange and superexchange interactions in these nanoparticles. It has been investigated that at 360...

Polycrystalline BaMnO3 ceramic powders were prepared using the conventional mixed oxide route accompanied with several milling processes. Single phase formation was verified by recording the X-ray diffraction pattern of the powder as well as sintered pellet at room temperature. Scanning electron micrograph and energy dispersive X-ray spectrum of cr...

Nanocrystalline perovskite oxide materials ABO(3) (where A = Ba, Ca, Mg, Sr; and B = Ce, Mn, and Ti) have been synthesized via sol-citrate combustion and hydrothermal-based methods with and without surfactant under mild conditions. Metal-titanates (ATiO(3)) were prepared using synthesized anatase-TiO2 nanotube powder, metal hydroxide/chloride solut...

A composite-hydroxide mediated method was employed to synthesize barium manganite nanorods. Diameter, surface smoothness and uniformity of these nanorods were optimized by varying reaction temperature and reaction time. The rods with an average diameter of 200 nm and length of 1–1.5 μm were obtained at optimum conditions of 200 °C/48 h. The dielect...

Nanoparticles are extensively used as efficient drug carriers in various biological studies. PEGylated barium manganate powder consisting of nanoparticles was synthesized using a hydrothermal technique. The nanoparticle morphology of the powder was confirmed via scanning electron microscopy. The average diameter of the nanoparticles was ~90 nm. The...

Nanoparticles are extensively used as efficient drug carriers in various biological studies. PEGylated barium manganate powder, consists of nanoparticles, was synthesized using hydrothermal technique. Nanoparticles morphology of the powder was confirmed via scanning electron microscopy. The average diameter of nanoparticles was ~90 nm. X-ray dif...

Barium manganate nanofibers were successfully synthesized for the first time after heat treatment of composite nanofibers of polyvinyl pyrrolidone (PVP), barium acetate and manganese acetate using electrospinning technique. Different PVP concentrations were used and the results show that PVP concentration had played important role in the formation,...

BaMnO3 nanorods were synthesized at 200 °C and atmospheric pressure using the composite-hydroxide mediated method. X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy were used to investigate the structure, size, morphology, phase purity and elemental composition of BaMnO3 nanorods. Electrical characterization o...