جامعة بلاد الرافدين - Bilad Alrafidain University - Assist. Lec. Saif Khalel Jasim

م.م سيف خليل جاسم

Assist. Lec. Saif Khalel Jasim

تدريسي : تقنيات الاشعة والسونار

Teaching : Department of Radiology Techniques

ماجستير علوم الفيزياء

MSC. Physics science

saifkhalil@bauc14.edu.iq

saifalaosy@gmail.com

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Research

	2024	International journal of nanoelectronics and materials
" Using a quick, easy, and effective one-step synthesis method called Q-switched neodymium-doped yttrium aluminum garnet (Nd: YAG)-pulsed laser ablation in liquid (PLAL), silver nanoparticles (NPs) are physically created. By using a pulsed laser at 532 nm to vaporize a metallic target (in this case, silver) submerged in deionized water, silver colloidal solutions are separately created. Laser parameters pulse of number (100, 200, and 300 pulse/sec) with constant ablation energy 500 mJ. The cubic crystalline structure of Ag particles was revealed by XRD, along with the formation of a pure cubic crystal structure of Ag particles and another cubic crystal structure attributed to AgO particles. The subsequent FESEM images showed the formation of highly spherical crystals (mean diameter 25.003 nm, 24.43 nm, and 9.75 nm). UV-Vis analysis reveals the absorption band of Ag NPs at (407, 406, and 404 nm), and the energy gap was (2.74, 2, 79, and 2.95 eV) respectively. The diagnosis of spherical colloidal Ag-NPs was approved by FESEM, and the PL spectra show two peaks at 320 and 639 nm, confirming the purity of the produced Ag-NPs. It is clear that the possibility of using the prepared nanoparticle in optoelectronics applications such as optical detectors, solar cells, and optical sensors. "

	2024	international journal of nanoelectronics and materials
In this work, the pulsed laser ablation technique was used, which is considered a good and distinctive method. Gold nanoparticles (AuNP) were prepared using an Nd-YAG laser with specific parameters, wavelength 1064 nm, constant ablation energy 1000 mJ, frequency 1 Hz, and different number of pulses (300, 600, and 900 pulse/sec). Deionized water was used as the medium liquid. The purpose of this study was to examine the change in these parameters on AuNP using a variety of Xrd, FESEM, Uv-Vis, force-hardness, and compression measurements. The pure cubic crystal structure of gold nanoparticles was analyzed using XRD. Subsequent FESEM images (average diameters 78.07nm, 49.15nm, 37.67nm) indicate that the particles had highly spherical and quasi-spherical shapes. Using ultraviolet analysis, the absorption band of gold nanoparticles was found and the wavelength was (518, 519, 524) nanometers, respectively. There were three different power gaps (1.895, 2.005, and 2.084) eV. In addition, mechanical property tests were conducted, where 2 ml of gold nanoparticles were mixed with (3 grams) of traditional dental filling. The hardness value increased by (3%). The results also showed an increase in the stress and strain value and an increase in Young’s modulus. Hence, an increase in the compressive strength. This indicates that AuNP affects the mechanical properties and enhances their effectiveness.

	2024	journal of nano- and electronic physics
" In this work, we used electrochemical etching of p-type silicon wafers for 10 min at a current density of 10 mA cm – 2 to obtain p-type porous silicon. Zinc oxide nanoparticles were produced using a chemical precipitation method (CPM) and applied to (glass, PSi) substrates using (DCM). XRD and UV-Vis have also been used to study the properties of films (structural and optical). According to the XRD data, the ZnO NPs are wurtzite-structured polycrystalline, with a favored orientation along the (101) plane. The size of the ZnO NP crystals was measured by the Scherrer formula and the crystal size was found to be 22.04 nm. Images and distribution plots obtained using atomic force microscopy (AFM) indicated that the p-PSi had a particle size of approximately 47.22 nm and a porosity of (48 %). An ultraviolet (MS) detector based on porous (Si)/ZnO NPs (metal semiconductor) was fabricated at a temperature of (85 °C). The fabricated device showed a maximum detector photoresponse of 2.08 A/W at a wavelength of 450 nm at a bias voltage (+ 3.35 V). The factory-made UV ZnO detector has a normalized detection (D* ) of approximately (2.9 x 1013) cm. 1/2 Hz/W at (λ = 450 nm). This approach provides an economical substrate and a facile synthetic method for optimizing the growth of pPSi/ZnO NPs, This has led to the successful fabrication of nanoscale photodetectors with potential applications for nanoscale photodetectors is displayed. "

	2024	AIP Conference Proceedings
In this work, copper and zinc nanoparticles were prepared using a pulsed laser ablation method, using a Nd- YAG laser with a wavelength of 532 nm, a fixed ablation energy of 600 mJ, and a number of different pulses (300, 600, and 900 pulse/sec) in deionized aqueous media. The results of XRD cubic symmetry for copper nanoparticles has been recorded zinc nanoparticles and that the system is hexagonal. The results of FESEM indicate obtaining the average size of diameters (42, 28, and 16 nm) respectively for CuNP. We average the size of diameters (48, 32, and 22nm) respectively for ZnNP. Through Uv-Vis spectra was the surface plasmon resonance was determined two peaks were obtained at (297, 295, and 297 nm) and (652, 658, and 655 nm) for CuNP and peaks at (297, 301, and 300 nm) for ZnNP respectively, as for the energy gap, its values were (3.067 eV, 3.074 eV, and 3.16 eV ) respectively, for CuNP, and (3.201 eV, 3.247 eV, and 3.28 eV) respectively for ZnNP. These findings have significant implications for various industrial and electronic applications involving these materials.

	2024	Indonesian Journal of Material Research
In this research, zinc nanoparticles were prepared using pulsed laser ablation in liquids. A pulsed Nd+:YAG laser with wavelength (532 nm) was applied to a pure zinc target immersed in deionized water, and the structural and optical properties of the prepared zinc nanoparticles were studied. The behavior of the UV absorption spectra of zinc nanoparticles was studied as a function of pulse number and ablation energy. The UV-vis absorption spectra showed absorption peaks in the ultraviolet region and in the visible region, the latter being responsible for the formation of zinc nanoparticles, and an increase in the intensity of the absorption peaks with increasing number of laser pulses was observed. Scanning electron microscopy results measured after examining drops of zinc nanoparticle solution showed that the nanoparticles were predominantly spherical in shape with nanoparticle sizes ranging from (42.49, 42.42, and 39.31 nm) respectively, and decreasing in size with increasing ablation pulses, with the best results at higher ablation pulses, the formation of zinc nanoparticles was confirmed by infrared spectroscopy, which confirmed the formation of nanoparticles.

	2024	Web of Semantics: Journal of Interdisciplinary Science
" In this work, silver nanoparticles were prepared in a good and distinctive way using the pulsed laser ablation in liquid (PLAL) technique, using an Nd-YAG laser with specific parameters with a wavelength of 1064 nm, an ablation energy of 1000 mJ, a frequency of 1 Hz, and varying the number of pulses by 300, 600, and 900, immersed in deionized water. This research was conducted to study these parameters on AgNP in terms of several measurements. XRD only shows the formation of the pure cubic crystal structure of AgO particles. The development of highly spherical crystals was revealed by subsequent FESEM images (average diameter 60.96 nm, 73.67 nm, and 64.07 nm), respectively. The absorption band of nanoparticles was detected by UV analysis and the wavelength was (404, 405, 410 nm) respectively. The energy gap was (2.39, 2.45, 2.48 eV), respectively. The spherical colloidal Ag-NPs were approved for characterization by FESEM. AgNP were also mixed with 3 g of regular dental filler and the mechanical properties were measured before and after mixing with 2 ml of silver nanoparticles. The results of compressive strength indicated an increase of (17.83%) and the hardness value increased by (5%). This indicates that AgNP have an effect on the mechanical properties and work to increase their efficiency."

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