Cobalt ferrite (CoFe
2
O
4
) and Barium titanate (BaTiO
3
) nanoparticles have been prepared by the microwave hydrothermal technique at 150 °C/60 min. The synthesized powders have been characterized ...using transmission electron microscopy, X-ray diffraction (XRD) and fourier transformation infrared spectroscopy. The XRD analysis confirms the formation of desired phase with crystallite sizes 25 nm for CoFe
2
O
4
and 20 nm for BaTiO
3
. The prepared powders were mixed at different weight proportions to obtain nanocomposites of (1 − x)CoFe
2
O
4
+ (x)BaTiO
3
(0 ≤ x ≤ 1) and densified at 910 °C/50 min via the microwave sintering process. The presence of two phases (CoFe
2
O
4
and BaTiO
3
) was confirmed using XRD and field emission scanning electron microscopy (FESEM). Ferroelectric (P–E) and magnetic (M–H) hysteresis loops have been studied at room temperature. In P–E loops, the coercive field and remanent polarization show light asymmetric behaviour with an increase of CoFe
2
O
4
phase concentration. The M–H loops infer that the magnetic saturation of the composite samples drops with increasing of BaTiO
3
phase concentration. The frequency dependent permittivity and permeability properties have been measured over a wide frequency range (100 kHz–1.8 GHz). The static magneto-electric (ME) voltage coefficient (dE/dH)
H
is measured by vary in ME output voltage against the dc-bias magnetic field (H) at room temperature.
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•Synthesized Ag and ZnO Nanoparticles via leaf extract of henna plant.•Acute oral toxicity and histopathology studies were done.•Showed non toxicity on tested mice for the period of ...14days.•Histopathlogical changes have been studied.
The Ag and ZnO nanoparticles are synthesized by a green method using Lawsonia inermis plant extract. The phytochemical constituent (2-hydroxy-1, 4-napthoquionone) found in the leaf extract of Lawsonia inermis plays an important role in the reduction and formation of Ag and ZnO nanoparticles. The biosynthesis of Ag and ZnO NPs was observed by the color change from colorless to dark brown and light brown. The FE SEM, TEM DLS analysis confirmed the average particle size of Ag and ZnO NPs as 100nm, 20nm, 28.5nm and 100nm, 20nm, 38.4nm respectively. Crystalline nature and presence of Ag and ZnO NPs were confirmed by XRD. The FT-IR spectra of the Ag and ZnO authorized the presence of phyto constituents as capping agent. From results of acute oral toxicity studies, it was found that Ag and ZnO NPs at 2000mg/kgb.w have shown no mortality during the treatment period. The present study revealed the safer use of eco-friendly green synthesized Ag and ZnO NPs in the field of nano-biomedicine.
Non enzymatic electrochemical glucose sensing was developed based on pristine Cu Nanopartilces (NPs)/Glassy Carbon Electrode (GCE) which can be accomplished by simple green method via
ocimum ...tenuiflorum
leaf extract. Then, the affect of leaf extract addition on improving Structural, Optical and electrochemical properties of pristine cu NPs was investigated. The synthesized Cu NPs were characterized with X-ray diffraction (X-ray), Uv–Visible spectroscopy (Uv–Vis), Fourier transformation infrared spectroscopy (FTIR), Particle size distribution (PSA), Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDS), Transmission electron microscopy (TEM) for structural optical and morphological studies respectively. The synthesized Cu NPs were coated over glassy carbon electrode (GCE) to study the electrochemical response of glucose by cyclic voltammetry and ampherometer. The results indicates that the modified biosensor shows a remarkable sensitivity (1065.21 μA mM
−1
cm
−2
), rapid response time (<3s), wide linear range (1 to 7.2 mM), low detection limit (0.038 μM at S/N = 3). Therefore, the prepared Cu NPs by the Novel Bio-mediated route were exploited to construct a non-enzymatic glucose biosensor for sustainable clinical field applications.
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Current study describes the green, environmental friendly, and cost-effectiveness technique for the preparation of MgO nanoparticles (NPs) via white button mushroom aqueous extract. The synthesized ...MgO NPs were characterized using equipments such as X-ray diffraction, dynamic light scattering (DLS), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and thermal gravimetric analysis (TGA) for average crystalline size, particle size, morphology, elemental analysis, and weight loss of the materials, respectively. This study reports the application of gardened sizes of (20, 18.5, 18, 16.5, and 15 nm) biosynthesized MgO NPs on seed germination. The smaller size (15 nm) MgO NPs have been enhanced the seed germination and growth parameters as compared with remaining sizes of MgO NPs and control. The magnesium oxide NPs penetrates into peanut seeds and affecting on seed germination and growth rate mechanism. In addition, this germination found to be high in seeds than germination on selected soil plot MgO NPs (0.5 mg/L stable concentrations) compared to different size of MgO NPs and control. Physicochemical methods indicated that the MgO NPs are able to penetrate into the seed coat and support water uptake inside of seeds. Probably, this positive effect may cause for the uptake of MgO NPs by the plants, as indicated in the UV and SEM analyses. As the smaller size (15 nm) of MgO NPs particles stimulates the development of seedling and growth enhancement of peanut, it clearly indicates that the current study is helpful in growing of peanuts in large-scale agricultural production.
Herein, we report a facile microwave-assisted hydrothermal method for the preparation of yttrium iron garnet (YIG, Y
3
Fe
5
O
12
)nanocrystals and realized the synergy between its structural and ...magnetic properties. The as-prepared powder thermal stability was characterized in detail by using thermogravimetric-differential thermal analysis (TG-DTA). The synthesized powder was microwave sintered at six different temperatures ranging from 973 to 1373 K for 60 min and characterized using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Magnetic properties were investigated by vibrating-sample magnetometer (VSM) and ferromagnetic resonance (FMR) studies. The frequency variation of dielectric and magnetic properties was measured in the frequency range of 100 kHz–1.8 GHz. The observed magnetic and dielectric parameters such as saturation magnetization, coercivity, permeability, linewidth, dielectric constant and magnetodielectric losses are strongly affected by sintering temperature. The saturation magnetization and coercivity of YIG were found in the range 14.4–28.0 emu/g and 35–87 Oe, respectively. Furthermore, the FMR linewidth decreases from 844 to 204 Oe. This analysis undoubtedly demonstrates that the synthesis method and sintering temperature have the prominent effect on the electrical and magnetic properties of YIG and would be very useful for the garnet-based microwave device applications.
A few-layered graphene (FLG)/cadmium oxide (CdO) nanocomposite was sucessfully prepared through ultrasonic-assisted synthesis. The morphology of FLG (1.0 wt.%, 2.0 wt.%, and 3.0 wt.%)/CdO ...nanocomposites were characterized using high-resolution transmission electron microscopy and field emission scanning electron microscopy techniques. The optical properties were studied with the help of UV–Vis diffuse reflectance spectroscopy and Raman spectroscopy, while the crystalline phases were analyzed using x-ray diffraction. The doctor blade method was used to deposit FLG/CdO nanocomposites on fluorine-doped tin oxide conductive glass substrates. The effect of FLG weight percentage (1.0 wt.%, 2.0 wt.%, and 3.0 wt.%) was studied on the power conversion efficiency of dye-sensitized solar cell applications. The photovoltaic characteristics, current density–voltage curves were measured with ruthenium (II)-based dye under air mass condition 1.5G, 100 m W m
−2
of a solar simulator. The results showed that higher power conversion efficiency of 3.54% was achieved at the appropriate weight percentage of FLG (1.0 wt.%)/CdO nanocomposite, compared to the CdO and other nanocomposite working electrodes FLG (2.0 wt.%, and 3.0 wt.%)/CdO.
In this study, we investigated the structural and electrical properties of TiO2/Ta2O5 stacks prepared using DC reactive magnetron co-sputtering for as-deposited films and films annealed at 700 °C. ...X-ray diffraction studies revealed that the as-deposited films were amorphous, whereas those annealed at 700 °C were polycrystalline with mixed phases of TiO2 and β-phase Ta2O5. The presence of mixed phases of TiO2 and β-phase Ta2O5 was also confirmed by Fourier-transform infrared spectroscopy. The optical band gap of the TiO2 films was 3.46 eV for the as-deposited films and decreased to 3.35 eV with increasing Ta2O5 layer thickness on TiO2. The films annealed at 700 °C showed a decrease in band gap to 3.32 eV for TiO2, and this value further decreased to 3.15 eV with increasing Ta2O5 layer thickness on TiO2. Furthermore, we investigated the electrical properties of the sputtered TiO2/Ta2O5 stacks fabricated on a metal–insulator–semiconductor (MIS) Al/Ta2O5/TiO2/p-Si Schottky diode. We studied the variation of the fundamental Schottky barrier characteristics (ideality factor, Schottky barrier, and series resistance) for a diode prepared using reactive magnetron sputtering with TiO2/Ta2O5 as a thin insulating layer at the Al/p-type Si interface with different thicknesses at both room temperature and 700 °C. Improved electrical characteristics were observed for the annealed Al/Ta2O5/TiO2/p-Si MIS Schottky structure compared with those of the as-deposited structure.
•The structural and electrical properties of TiO2/Ta2O5 stacks were investigated.•The variation of the fundamental Schottky barrier characteristics was studied.•The Schottky barrier height for the annealed is higher than the as-deposited one.•The Schottky barrier height extracted from C-V is greater than one from I-V.
The study describes the antibacterial and anticancer activities of a nanocomposite prepared by mixing zinc oxide and titanium dioxide nanoparticles. The particle mixtures were analyzed by X-ray ...diffraction, Field emission scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and dynamic light scattering techniques. Thus, analyzed samples were subject to disc diffusion method at various concentrations to analyze their antibacterial activities against two Gram-positive and two Gram-negative bacteria. The same samples were then analyzed for their anticancer activities on four different cell lines. The results indicate a synergistic effect of the nanocomposite on both antibacterial and anticancer properties when compared to their individual counterparts.
Globule shaped nanoparticles of zinc oxide were prepared using a simple solution combustion method in the presence of TWEEN 80. The nanoparticles were 80 ± 20 nm in size with a hexagonal Wurtzite ...structure. Fourier transform infrared spectroscopy analysis of the samples showed the presence of no impurities. The size of the nanoparticles decreased with increasing concentration of TWEEN 80, peaking at a concentration of 0.05 M, above which the particle sized started to increase again. The antibacterial studies conducted on all of the samples revealed the superior activity of the zinc oxide nanoparticles prepared using the highest concentration of TWEEN 80.
A non-enzymatic glucose biosensor was developed by utilizing the zinc oxide nanoparticles (ZnO NPs) synthesized by a novel green method using the leaf extract of Ocimum tenuiflorum. The structural, ...optical and morphological properties of ZnO NPs characterized by means of X-ray diffraction (XRD), ultraviolet-visible (UV–vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray (EDAX) spectroscopy, and transmission electron microscopy (TEM). The XRD analysis revealed that the ZnO NPs were crystalline and had a hexagonal wurtzite structure. The crystallite size measured by XRD was the same as that measured using SEM and TEM. The UV–vis absorption spectrum estimates the band gap of ZnO NPs present in the range of 2.82 to 3.45eV. The reduction and formation of ZnO NPs mainly due to the involvement of leaf extract bio-molecular compounds analyzed from the FTIR spectra. The SEM result confirms the morphology of the NPs responsible from the various concentration of leaf extract in the synthesis process. HRTEM analysis depicts the spherical structure of ZnO NPs. The synthesized NPs have the average size ranges from 10 to 20nm. The fabricated GCE/ZnO glucose sensor represents superior electro catalytic activity that has been observed for ZnO NPs with a reproducible sensitivity of 631.30μAmM−1cm−2, correlation coefficient of R=0.998, linear dynamic range from 1–8.6mM, low detection limit of 0.043μM (S/N=3) and response time<4s.
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•Bio-mediated route has been employed to prepare spherical shape ZnO NPs.•The Green synthesized ZnO NPs shows excellent electrocatalytic activity toward glucose.•It shows linear range (1∼8.6mM), limit of detection (0.046μM) and sensitivity (681.60μAmM-1cm-2 ) for glucose biosensor.•Compared to the chemical and physical, Bio-mediated route shows excellent properties for Non enzymatic glucose sensor.
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