Applied Physics
Husam Nahedh; Odai N. Salman; Mukhlis M. Ismail
Abstract
In this study, sodium bismuth titanate ferroelectric ceramics with a nanoscale structure and low iron content (NBTF) were prepared, providing an alternative to lead-based materials. Lead poses environmental and health risks due to its toxicity. NBTF aims to develop a more sustainable ferroelectric composition. ...
Read More ...
In this study, sodium bismuth titanate ferroelectric ceramics with a nanoscale structure and low iron content (NBTF) were prepared, providing an alternative to lead-based materials. Lead poses environmental and health risks due to its toxicity. NBTF aims to develop a more sustainable ferroelectric composition. The structural, optical, and electrical properties of Na0.5Bi0.5Ti1-xFexO3-0.5x (x=0.06) were investigated. X-ray diffraction revealed the material crystallizes in the rhombohedral phase, with crystallite size of approximately 19.1 nm in size. Infrared and Raman spectroscopy confirmed the formation of a perovskite structure containing Fe ions, evidenced by Ti-O stretching and O-Fe-O bending vibrations. Raman spectroscopy also identified a broad peak at high frequencies, suggesting the generation of oxygen vacancies induced by the dopant. Electrical characterization demonstrated semiconductor behavior with a bandgap of 1.84 eV, showing potential for optoelectronic applications. The study focused on the effect of oxygen vacancies on electrical conductivity. Furthermore, a nano-perovskite heterojunction photodiode comprising Al/p-Si/NBTF/Ag was successfully fabricated and evaluated. Under reverse bias, photocurrent increased compared to the dark state with rising illumination intensity. Device parameters including reaction order, ideality factor, and carrier lifetime were calculated. Collectively, these results indicate promise for integrating this heterostructure photodiode into electronic circuitry applications.
Nanotechnology
Wasan Ziedan; Mukhlis M. Ismail; Wafaa A. Hussain
Abstract
Aqueous solutions with heavy metals such as Cr (VI), Pb, and Cd (II) can have an adverse effect on human health because of their toxicity. As a result, it is important to remove these heavy metals from the aquatic environment to save the human healthy. X-ray diffraction (XRD), Fourier-transform infrared ...
Read More ...
Aqueous solutions with heavy metals such as Cr (VI), Pb, and Cd (II) can have an adverse effect on human health because of their toxicity. As a result, it is important to remove these heavy metals from the aquatic environment to save the human healthy. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and field-emission scanning electron microscopy (FE-SEM) used in this research to characterize cobalt ferrite (CoFe2O4) nanoparticles and confirm the structure of Co-Fe2O4. These particles were used to make porous samples and burned at 1050 °C in mixtures of (0, 3, 5, 7, and 10) wt.% of cobalt ferrite and kaolin with 20 wt.% of charcoal. These samples serve as adsorbents that remove Pb from the wastewater. The highest rates of removal were confirmed using various treatments at (pH 3, 7, and 9). A Williamson-Hall plot was used to determine the crystal size (33) nm. The FT-IR spectra exhibited spinel-ferrite characteristics. Studies using FE-SEM demonstrated that the sample was in Nano crystalline. Using a vibrating sample magnetometer (VSM), different magnetic properties are taken from the hysteresis loops such as saturation magnetization (Ms) and remanence (Mr) and coercivity (Hc). It was found that increasing ferrite content, increased adsorption efficiency.
Applied Physics
Sura R. Mohammed; Mukhlis M. Ismail; Isam M. Ibrahim
Abstract
Polyaniline nanofibers (PAni-NFs) have been synthesised under various concentrations (0.12, 0.16, and 0.2 g/L) of aniline and different times (2h and 3 h) by hydrothermal method at 90°C. Was conducted with the use of X-ray diffraction (XRD), Fourier Transform Infrared spectra (FTIR), Ultraviolet-Visible ...
Read More ...
Polyaniline nanofibers (PAni-NFs) have been synthesised under various concentrations (0.12, 0.16, and 0.2 g/L) of aniline and different times (2h and 3 h) by hydrothermal method at 90°C. Was conducted with the use of X-ray diffraction (XRD), Fourier Transform Infrared spectra (FTIR), Ultraviolet-Visible (UV-VIS) absorption spectra, Thermogravimetric Analysis (TGA), and Field Emission-Scanning Electron Microscopy (FE-SEM). The X-ray diffraction patterns revealed the amorphous nature of all the produced samples. FE-SEM demonstrated that polyaniline has a nanofiber-like structure. The observed typical peaks of PAni were (1580, 1300-1240, and 821 cm-1), analysed by the chemical bonding of the formed PAni through FTIR spectroscopy. Also, tests indicated the promotion of the thermal stability of polyaniline nanocomposite at temperatures above 600°C. Still, the PAni-0.12 g/L sample was better than the other samples, and the optical parameters manifested a decrease in the band gap (Eg) band gap. The observed TGA test findings also promoted polyaniline's thermal stability at temperatures reaching 600°C.
