In this investigation, n-type (100) silicon wafers with a thickness of 600 ± 25 μm and resistance of 0.1-100 μΩ were used to manufacture porous silicon. With the aid of hydrofluoric acid (HF) with a 20% concentration, a current density of 20 mA/cm2, and various experimental drilling times of 5, 15, and 25 minutes with the fixation of other parameters, the photoelectrochemical etching method was successful. The morphology of porous silicon was investigated using scanning electron microscopy (SEM), the XRD- diffraction wide of porous silicon creation with rising apex peaks was confirmed, and (AFM) sponge-like morphology was seen, and the pore diameter grew larger as drilling time rose. In a drilling time of 15 minutes, it is able to quantify both the vibrational and electrical characteristics of the energy band gap using Raman analysis and PL detection. Investigate sample samples' current voltage readings (J-V) at various etching times. Additionally, we discovered devices with a broad wavelength that react to the response in the investigation of the spectrum response PS AL/PS/SI/Al as a photodetector.
In of this studying the green synthesis of Iron Oxide nanoparticles (Fe 2 O 3 NPs) with Celery stalks and green tea leaves extract were used. The fresh suspension of plant extracts ware green-brown in color. However, after acting of FeNO 3 within 20min, the suspension showed the change in color and turned dark brown after 4 hours of incubation at room temperature. Formation of Iron oxide nanoparticles was confirmed using X-ray is spectral analysis and showed the characteristic Bragg peaks of (111) to green tea extract and (111) to celery extract, plant of the face center cubic (FCC) Iron Oxide nanoparticles. The scanning electron microscope (SEM) Iron oxide nanoparticles see small particles and rode. The synthesized Fe 2 O 3 NPs colloidal solution has shown better antibacterial activity against both Gram-positive and Gram-negative bacterial strains. The diameters of the inhibition zones of Fe 2 O 3 NPs against the bacterial strains were, S. aureus (27 mm) p. aerugino (29mm) with camellia sinensis extract and S. aureus (22 mm) p. aerugino (25mm) with Apium graveolens exiract at 50 µg/ml concentration.
In this work, palladium nanoparticles (Pd NPs) are synthesized by laser ablation in liquid (PLAL) with wavelength 532[Formula: see text]nm (second harmonic Nd:YAG laser) at different laser energies 360, 660, and 800[Formula: see text]mJ with 200 pulses and an electric coil is used to generate a magnetic field. The resulting nanosolution was deposited on the previously prepared PS. The morphological and structural properties of the prepared substrates (Pd NPs/PS) are calculated by X-ray diffraction (XRD) pattern, Atomic Force Microscope (AFM), and Transmission Electron Microscopy (TEM). Their results showed that with the increase in the energy of laser pulse, the average particle size was 30.73, 22.60, and 18.01[Formula: see text]nm. Optical properties of Photoluminescence (PL) spectra show decrease of energy band gap at 2.38, 2.43, and 2.47[Formula: see text]eV with an increase in the energy. The sensitivity of application samples Pd NPs/PS/Si gas sensors for NO2 and H2S gas was also investigated with respect to temperature variations. Pd NPs/PS/Si gas sensors have a maximum sensitivity of NO2 gas around 52.6% at [Formula: see text]C for sample prepared at energy 360[Formula: see text]mJ but the highest sensitivity of H2S gas was 31.2% at [Formula: see text]C for energy of 660[Formula: see text]mJ. The effects of the operating temperature on reaction and recovery durations for various laser ablation energies are also discussed.
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