A competitive new technology, organic metallic halide perovskite solar cells feature a wide working area, low manufacturing costs, a long lifespan, and a significant amount of large efficacy of power conversion (PCE). The spin-coating technique was utilized for the fabrication of pure CH3NH3PbBr3 (MAPbBr3) thin films, and these films are implanted with 600 keV silver (Ag) ions at fluency rate of 6 × 1014 and 4 × 1014 ions/cm2. XRD analysis confirmed the cubic structure of MAPbBr3. A high grain size was observed at the fluency rate of 4 × 1014 ions/cm2. The UV-Vis spectroscopic technique was used to calculate the optical properties such as the bandgap energy (Eg), refractive index (n), extinction coefficients (k), and dielectric constant. A direct Eg of 2.44 eV was measured for the pristine film sample, whereas 2.32 and 2.36 eV were measured for Ag ion-implanted films with a 4 × 1014 and 6 × 1014 ions/cm2 fluence rate, respectively. The solar cells of these films were fabricated. The Jsc was 6.69 mA/cm2, FF was 0.80, Voc was 1.1 V, and the efficiency was 5.87% for the pristine MAPbBr3-based cell. All of these parameters were improved by Ag ion implantation. The maximum values were observed at a fluency rate of 4 × 1014 ions/cm2, where the Voc was 1.13 V, FF was 0.75, Jsc was 8.18 mA/cm2, and the efficiency was 7.01%.
Electrochemical sensors are gaining significant demand
for real-time
monitoring of health-related parameters such as temperature, heart
rate, and blood glucose level. A fiber-like microelectrode composed
of copper oxide-modified carbon nanotubes (CuO@CNTFs) has been developed
as a flexible and wearable glucose sensor with remarkable catalytic
activity. The unidimensional structure of CNT fibers displayed efficient
conductivity with enhanced mechanical strength, which makes these
fibers far superior as compared to other fibrous-like materials. Copper
oxide (CuO) nanoparticles were deposited over the surface of CNT fibers
by a binder-free facile electrodeposition approach followed by thermal
treatment that enhanced the performance of non-enzymatic glucose sensors.
Scanning electron microscopy and energy-dispersive X-ray analysis
confirmed the successful deposition of CuO nanoparticles over the
fiber surface. Amperometric and voltammetric studies of fiber-based
microelectrodes (CuO@CNTFs) toward glucose sensing showed an excellent
sensitivity of ∼3000 μA/mM cm2, a low detection
limit of 1.4 μM, and a wide linear range of up to 13 mM. The
superior performance of the microelectrode is attributed to the synergistic
effect of the electrocatalytic activity of CuO nanoparticles and the
excellent conductivity of CNT fibers. A lower charge transfer resistance
value obtained via electrochemical impedance spectroscopy (EIS) also
demonstrated the superior electrode performance. This work demonstrates
a facile approach for developing CNT fiber-based microelectrodes as
a promising solution for flexible and disposable non-enzymatic glucose
sensors.
Sol-gel auto combustion method was adopted to fabricate magnesium ferrite (MgFe2O4) nanoparticles. The structural and morphological properties was studied by XRD, FTIR, and SEM analysis. The average particle sizes of MgFe2O4 was in the range of 35–55 nm. The octahedral & Tetrahedral bond lengths, R
AE (tetrahedral edge length), R
BE (shared octahedral edge length) and R
BEU (individual octahedral edge length), cationic radii (tetra and octa-sites) were also determined. The magnetic strength also showed direct reliance on bond angle and indirect to bond length. Hoping length L
a and L
b and bond angles are also measured. The frequency dependent conductivity and dielectric properties of MgFe2O4 were investigated by Impedance analyzer. The photocatalytic activity (PCA) is appraised against MB (methylene blue) dye and MgFe2O4 calcined at 800 °C showed promising degradation (78%) under visible light irradiation. The findings revealed that MgFe2O4 is can harvest the solar light, which could be employed for the remediation of wastewater contains textile dyes.
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