لمى حافظ عبد

The core-shell structure has good structural, optical, and electrical properties that make it useful for lighting devices and medical uses. According to this study, laser ablation in liquid makes CdS and Cu target nanoparticles. It was looked at how the core-shell method changed laser ablation and the properties of CdS@Cu NP. At 1064 nm and 480 mJ, Nd:YAG laser waves cut through CdS and Cu nanoparticles in water, which are the core and shell, respectively. The structure features showed that CdS was being made, which improved the crystallinity of laser ablation. The clumping of particles was slowed down by creating cores or shells. Plasmon absorption peaks were seen in UV-VIS spectroscopy, X-ray diffraction, Field Emission Scanning Electron Microscopy (FESEM), and Atomic Force Microscopy (AFM). According to XRD, the CdS@Cu phase was shaped like a cube. Clusters of spherical particles were about 60 nm in size in the FESEM. The synthesis was successful because the AFM showed the atomic makeup, a surface roughness of 2.397 nm (RMS) and 1.936 nm (Ra), and an average diameter of 14.16 nm. The ROS Reactive Oxygen Species production by CdS@Cu NPs stopped the growth of Escherichia coli, Staphylococcus aureus, Candida, and Pseudomonas aeruginosa. Creating a new chemical with special physical qualities that stops the growth of many types of bacteria effectively. It is possible to use this chemical in many different ways in health. This shows how versatile they are in fighting different kinds of germs and improving health and society.

Core-shell nanoparticles, known for their structural, optical, and electrical properties, being investigated for optoelectronic and medicinal applications. CdS and Cu nanoparticles are synthesized via laser ablation in a liquid media, concentrating on the core-shell technique's effect on laser ablation and CdS@Cu nanoparticle characteristics. Nd:YAG laser pulses at 1064 nm and 480 mJ ablate CdS and Cu nanoparticles in water, with CdS being the core and Cu the shell. Ablation improves crystallinity and CdS production, according to structural studies. The core or shell morphology reduces particle aggregation. UV-VIS spectroscopy, XRD, FESEM, and AFM verify unique features. The CdS@Cu phase is cubic according to XRD. FE-SEM shows 34.2-90.7 nm spherical particle clusters, and AFM confirms synthesis.

In this work, cadmium sulfide (CdS) nanoparticles were prepared by pulsed laser ablation of CdS targets in distilled water (DW), which served as the solvent and reducing agent. Using 300 pulses and a repetition frequency of 6 Hz, an Nd:YAG laser (1064 nm, 480 mJ) was used. The x-ray diffraction (XRD), atomic force microscopy (AFM), field-emission scanning electron microscopy (FE-SEM), and UV- VIS spectroscopy were used to introduce and characterize the prepared samples. Plasmonic absorption was observed with discrete peaks using UV-Visible spectroscopy. The cubic structure of the CdS phase was validated using XRD patterns. Clusters ranging in size from 34.2 to 90.7 nm were formed with spherical particle dispersion, as shown by FE-SEM. The topography was studied by AFM showing a root mean square surface roughness of 2.833 nm, an average roughness of 2.354 nm, and an average diameter of 11.29 nm. These results validate the successful synthesis of materials for use in a variety of applied physics applications.

The Nanocrystalline porous silicon (PSi) is developed by using method of electro-chemical etching of n-type silicon chip with orientation (100) by using Teflon cell, HF with 40% concentration and ethanol with purity (99.9%) in (1:1) ratio at etching current density (5mA/cm2) for 22min etching time. The chemical structure of (porous layer) was analyzed by using SEM, FTIR, XRD, and UV-Vis. The electrical properties of AgNP/PSi/ c-Si junction was studied using illuminated I-V, C-V measurement, dark I-V, and Responsivity. The current study demonstrates improvement in electrical properties of PSi photodetector after embedding AgNPs.