منصة إيفاد العلمية

د. رسل محمد شهاب

إرسال رسالة

التخصص: دكتوراه في تقانات الليزر والكهروبصريات

الجامعة: الجامعة التقنية الوسطى/الكلية التقنية الهندسية الكهربائية

النقاط:

30.5

معامل الإنتاج البحثي

الخبرات العلمية

العديد من تقييم البحوث العلمية
العديد من البحوث المنشورة في مستوعبات سكوباس وكلارفيت
العديد من الاعمال التطوعية
العديد من الانشطه الطلابية الاصفية
العديد من الدورات والورش والندوات

الأبحاث المنشورة

Characterization of (Nanostructures Silver/Silicon Nano Porous) Active Substrates for Surface Enhanced Raman Scattering (SERS) as a Function to Porous Silicon Parameters

المجلة: Eng. &Tech.Journal, Vol.33,Part (B), No.3,2015

سنة النشر: 2015

تاريخ النشر: 2015-04-02

Electrochemical etching processes at different current densities were used to prepare nano porous silicon with different porosities. A series of nanostructures silver/ nano porous silicon (NAg/NPSi) active substrate was prepared by an immersion-plating method. Through controlling the current density, the surface-enhanced Raman scattering (SERS)behaviors to crptocyanen (CY) dye were contrastively studied, for a concentration of (10−5 M),The (SERS) behavior was attributed to the size of the deposited silver nanoparticles on porous layer. The sensitivity of SERS signal increases with increasing the porosity of the porous sample.

Preparation and Characterization of Nano Porous Silicon for Chemical Detection Applications

المجلة: Eng. &Tech.Journal, Vol.33,Part (B), No.2, 2015

سنة النشر: 2015

تاريخ النشر: 2015-03-05

T In this research Photo-electrochemical etching process was used to prepare nano porous silicon from n-type Si. The characteristics of Silvered porous silicon samples (active-substrate), were studied as substrates in terms of surface-enhanced Raman scattering (SERS) phenomena. Maximum of (SERS) enhancement for Cresyl violet (CV) dye was obtained. The active substrate was prepared by the immersion plating from the water solution of AgNO3 with the (10-2M) concentration during (5min). The relation between the etching parameters, morphology of porous silicon surface and its SERS efficiency after silver deposition is examined .We show that the nano (PSi) allows the formation of a film with close-packed silver nano crystals, which possess strong surface enhancement properties.

Optimizing Plasmonic Characteristics of Ag-AuNPs/Nanohillocks Si Heterostructures for Efficient SERS Performance

المجلة: International Journal of Nanoelectronics and Materials

سنة النشر: 2020

تاريخ النشر: 2020-03-06

Tunable bimetallic Ag-Au nanoparticles (Ag-AuNPs) and hot spot regions were created through the reduction of Ag-Au ions onto nanohillock silicon surfaces. A set of as-prepared textured silicon substrates with different nanohillock topographies was synthesised by a wet potassium hydroxide (KOH) chemical etching process on crystalline silicon for incubation times from 4 to 10 min. These structures were explored as a substrate for optimizing the plasmonic characteristics of Ag-AuNPs/nanohillocks Si surface-enhanced Raman scattering (SERS) heterostructures. The goal of this paper is to create sufficient SERS heterostructures with a high enhancement and exceptional reproducibility. The nanohillock Si substrate was employed to create nearly homogeneously distributed Ag- AuNPs and hot spot regions with extraordinary specific surface area (S.S.A.) values. Plasmonic characteristics of the created Ag-AuNPs were investigated and analysed based on the surface features of the substrate via atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM), X-ray diffraction spectroscopy (XRD), energy- dispersive X-ray spectroscopy (EDS) and Raman measurements. Tunable Ag-AuNPs sizes and hot spot regions were synthesized by controlling the incubation time of the wet KOH chemical etching process. The density and size distribution, and hence the plasmonic characteristics of the Ag-AuNPs and hot spot regions, were improved significantly with increasing surface roughness and average hillock height of the substrate and specific surface area of the Ag-AuNPs. A high enhancement factor of 3.7×1013 with a minimum reproducibility deviation of about 4% was attained in 10−14 M rhodamine 6G dye for an 8 min etching incubation time.

The Performance of Plasmonic Gold and Silver Nanoparticle-Based SERS Sensors

المجلة: Iraqi Journal of Science

سنة النشر: 2020

تاريخ النشر: 2020-03-19

The influence of different types of plasmonic gold (Au-NPs) and silver (Ag-NPs) nanoparticles as well as aging on the performance of Surface-Enhanced Raman Scattering (SERS) sensors were studied. The average diameters of Au-NPs and Ag- NPs were about 23 nm and 15 nm, respectively, with a number of laser pulses of about 200. plasmonic nanoparticles were synthesized by laser ablation process in distilled water using a fixed energy laser fluence of about 14 J/cm2 of Nd-YAG laser, with 1060 nm wavelength and 1 Hz pulse repetition rate. The SERS sensor was carried out by quick drop casting process of plasmonicplasmonic nanoparticles on glass substrates. The morphological aspects and the performance of SERS sensors were investigated by high resolution transmission electron microscopy (HR- TEM) and Raman spectroscopy. All the results indicated the significant dependence of the performance of the sensor on the types of the plasmonic nanoparticles . The obtained Raman signal intensity of Ag-NPs was about 105a.u. compared with 103a.u. for Au-NPs. While, the stability of Au-NPs was much higher than that of Ag-NPs based on SERS sensors due to the normal oxidation process of Ag-NPs.

Optimization of an ultra-sensitive Ag core-Au shell nanoparticle/Si Surface-enhanced Raman scattering (SERS) sensor

المجلة: AIP Conference Proceedings

سنة النشر: 2020

تاريخ النشر: 2020-12-15

Well-controlled Ag core/Au shell nanoparticles (NPs) of various shell thicknesses were synthesized in water using a laser ablation process via a low energy 1060 nm Nd-YAG laser with fluence of approximately 14 J/cm2 and a 1 Hz pulse repetition. Ag core NPs with a mean diameter of 42 nm were prepared by circa 300 pulses of a fixed energy fluence of 14 J/cm2, while Au NPs ranging from 10 to 45nm shell thickness were achieved by delivering pulses of 250 to 400nm to the Au plate. Ag core/Au shell NPs surface-enhanced Ramen scattering (SERS) sensors were synthesized by depositing the resulting bimetallic NPs onto silicon substrates using a drop casting process. The composition of the synthesised SERS sensors was confirmed using field emission scanning electron microscopy FE-SEM, HRTEM, Ultraviolet-visible spectroscopy UV-vis, XRD diffractometer, and Raman microscopy. These results showed that the performance of the novel SERS substrate had a significant effect on NPs shell thickness. The shell thickness was improved by a factor of 4.8x1011 to 1.2 x1014 for 250 to 400 nm, respectively, due to the hotspot dynamics of the core/shell NPs

Modified laser-etched silicon covered with bimetallic Ag–Au Alloy nanoparticles for high-performance SERS: laser wavelength dependence

المجلة: Indian Journal of Physics

سنة النشر: 2021

تاريخ النشر: 2021-09-19

The effect of etching laser wavelength on the performance of bimetallic alloy Ag–Au nanoparticles (Ag–AuNPs) SERS-active substrate was investigated. Two kinds of macro-P-Si structures were synthesized by a laser-assisted etching process using two laser wavelengths 650 and 532 nm. Ag–AuNPs/macro-P-Si SERS-active substrate was made up via the ion reduction process. The SERS-active substrates were investigated by utilizing XRD, FE-SEM microscope, EDS analysis and Raman microscope. P-Si surface modification process by bimetallic alloy Ag–AuNPs was carried out to form efficient and nearly uniformly distributed Ag–AuNPs hot spot regions with ultra-high specific surface areas. The morphological features of the deposited Ag–AuNPs on the P-Si layer prepared by 650 nm exhibited that the nucleation process is mainly concerted on the pore boundaries with a low tendency for aggregation …

The effect of space debris on near-Earth space

المجلة: Research square

سنة النشر: 2022

تاريخ النشر: 2022-05-24

The research describes the effect of space debris on near-Earth space in order to reveal the concept of space debris composition and origin of debris, to determine the effect of space debris on space orbital flights by discussing the spatial distribution of debris, the Collisions of spacecraft with debris and their consequences, the probability of collisions of spacecraft with debris, and Measures to limit debris contamination of near-Earth space. Also, the expected consequences of debris contamination of space and the Earth have been identified in this research as the frequency of dangerous encounters between debris and vehicles will almost double. By 2059, this figure will quadruple. If we translate this prediction into absolute numbers, it turns out that in 2019 satellites and space debris converged 20 thousand times a week, and in 2059–50 thousand. Now the number of such events is about 13 thousand per week. The need to track hazards and ensure evasive maneuvers will significantly increase the cost of space missions. The research describes the ways to remove space debris from orbit by using jet propulsion devices (both high and low thrust), aerodynamic braking means, Collection of artificial objects using special spacecraft and their subsequent withdrawal, and using a solar sail.

Improved the sensitivity and limit of detection of surface alloying SERS sensors by controlling mixing ratio of trimetallic (Ag-Au-Pd) nanoparticles

المجلة: International Journal of Nanoelectronics and Materials

سنة النشر: 2022

تاريخ النشر: 2022-08-25

In this study, three different types of hybrid structures SERS sensors made from different mixing ratio of trimetallic (Ag-Au-Pd) nanoparticles of [Au1: Ag1: Pd1] , [Au1: Ag2: Pd1] , [Au1: Ag2: Pd2] in surface alloying forms deposited on macro porous silicon (macroPsi) layer were created and extensively tested. By using a simple and fast immersion process, trimetallic (Ag-Au-Pd) nanoparticles were created utilizing ion reduction of numerous metallic salts on a macro porous silicon (macroPsi) layer. The macroPsi layers were created using a laser assisted etching (LAE) technique for 15 minutes with a constant density of approximately (28mA/c.m2). At a constant concentration (10-3 M) of HAu.Cl4, Ag.NO3 and Pd.Cl2 to synthesize Au-NPs, Ag-NPs and Pd-NPs, immersion processes with various mixing ratios were performed. The hybrid structures of SERS sensors were examined using XRD, FE- SEM, and Raman microscopes. The sensors were tested at different concentrations from 10- 6 to10-12 of MB target molecules. The SERS trimetallic sensors demonstrated a considerable reliance on hot spot zones among trimetallic nanoparticles. Higher enhancement factor with lower detection limit of Raman signal was obtained from (Au 1: Ag 2: Pd 2) hybrid structures SERS sensor of about 1.5×1010 and 10-14 respectively, due to extra ordinary specific surface area and high surface density forming trimetallic nanoparticles . The variations of mixing ratio of trimetallic (Ag-Au-Pd) provide an effective pathway to develop the sensors performance towards detection of lower concentrations.

The Study of the Physical and Chemical Properties of Biopolymer Gel as a Drying Object

المجلة: sJournal of Medicinal and Chemical Science

سنة النشر: 2023

تاريخ النشر: 2023-07-24

This paper aims to investigate and generalize the structural, mechanical, thermophysical, hygroscopic, and field-specific features of biopolymer gel to create biodegradable packaging materials. Therefore, the mathematical dependences of thermophysical, structural-mechanical, hygroscopic, and specific characteristics of a biopolymer gel that have been established for this field of research can be utilized in engineering practice when designing production processes and devices in the field of packaging materials technology. The findings of this research are necessary for the scientific study of the kinetics and dynamics of processes involving the transfer of Heat and Mass, in particular Drying, modeling, and optimization, to conserve energy and resources during the processing and storage of food-related materials.

The zinc Lysinate-riboflavinate structure colloid particles are a kind of colloid particle

المجلة: Materials Today: Proceedings

سنة النشر: 2023

تاريخ النشر: 2023-02-10

Zinc Lysinate-riboflavinate is a new improved form of zinc that could be used to enrich whole milk products. This paper presents the findings of a study of the zinc Lysinate-riboflavinate phase composition. Its space group and crystal lattice type have been determined. The microstructure of zinc Lysinate-riboflavinate was investigated, and it was discovered that the samples are needle-shaped crystals with lengths ranging from hundreds of nanometers to several microns. Energy-dispersive microanalysis was used to determine the elemental composition of the material.

Dark matter subhalo disturbance in the tidal field: Towards a new simulations accuracy

المجلة: Materials Today: Proceedings

سنة النشر: 2023

تاريخ النشر: 2023-04-05

Dark matter (DM) identification is a pressing challenge for modern particle physics and cosmology. The success of this endeavor, however, is contingent on a number of parameters, some of which stem from the difficulty of predicting the DM sub-halo distribution in Milky Way-like galaxies and others from the effect of DM sub-halo signals on the gamma-ray instruments being utilized. This research compared the results of detailed simulations of individual DM sub-halos emerging in the external tidal fields with and without disc components and a baryonic bulge. The average DM particle is assumed to have a mass three times smaller than that assumed in cosmological zoom-in simulations of galaxy formation. The Via Lactea II simulation, which provides the basis for simulating the sub-haloes' tidal field in DM, was used to establish the baseline conditions for this investigation. A model of the Milky Way based on observations was used to simulate the tidal field; this model included a DM halo, a stellar bulge, and a stellar disc. When small (rp 24 kpc) percenters were included, the number of sub-haloes dropped to 39%, and the remaining sub-haloes were found to have a less dense orbital distribution. Since the total number of outer sub-haloes was only around 74% of the value anticipated by CDM, the addition of a stellar component to the tidal field had little effect on the sub-haloes with greater percenters. Previous research on the impacts of baryonic matter as mediated via the spurious disruption had reported ratios that were lower than the ones obtained in this study, suggesting that the latter's accuracy was to blame.

Using K-mean Clustering to Classify the Kidney Images

المجلة: Iraqi Journal of Science,

سنة النشر: 2023

تاريخ النشر: 2023-04-30

This study has applied digital image processing on three-dimensional C.T. images to detect and diagnose kidney diseases. Medical images of different cases of kidney diseaseswerecomparedwiththoseof healthycases.Fourdifferentkidneysdisorders, such as stones, tumors (cancer), cysts, and renal fibrosis were considered in additional to healthy tissues. This method helps in differentiating between the healthy and diseased kidney tissues. It can detect tumors in its very early stages, before they grow large enough to be seen by the human eye. The method used for segmentation and texture analysis was the k-means with co-occurrence matrix. The k-means separates the healthy classes and the tumor classes, and the affected parts were isolated from the healthy parts. To isolate the kidney from the other anatomical parts in a CT image, a mask must be generated, which is a binary image (0s or 1s). This mask was also utilized to remove undesired characteristics from the images. Density slicing was utilized to color the image based on its texture density. A slice is considered a band of neighboring gray levels in a gray scale image seen through monocular color. The gray scale band of (0-255) is transformed into a variety of color slices; it is the conversion of a gray scale image to a colored image that efficiently displays symmetric and diverse regions. Density slicing is a property process for segmentation. The unsupervised classification process, the K-Mean clustering, is used the application of K-mean on C.T. images to detect and classify the type of tumor in the kidney. The K-mean clustering separates each class depending on the texture properties and the distance from each class and color. This method of segmentation was used to separate the affected part from the healthy part of the tissue; the K-mean with Co-occurrence matrices gives statistical properties such as energy, homogeneity, contrast, and correlation. These give an indication of the nature of the tissues that are different in density. The standard deviation for the cancer was higher than the stone, so was the mean, the contrast and the correlation. This means that the texture of the cancer was brighter and has a none of grey level more than the stone and this can be seen from the energy value; the texture of the cancer was highly correlated. This method proved to be a good method for the early diagnosis.

Mask Laws to study Texture Features of the Kidney Infection

المجلة: Iraqi Journal of Science

سنة النشر: 2023

تاريخ النشر: 2023-05-30

This paper aims to early study of detection and diagnosis of kidney tumors and kidney stones using Computed Tomography Scanning CT scan images by digital image processing. Computerized Axial Tomography (CAT) is a special medical imaging technique that provides images with 3D, including much information about the body's construction consisting of bones and organs. A C.T scan uses X-rays to create cross-sectional images of the body and gives the doctor a full explanation of the diagnosis of the situation through the examination. It has been used in five cases of kidney images, including healthy, stones, tumors (cancer), cystic and renal fibrosis. The masking procedure is used to separate the required C.T. images from undesirable ones. The segmentation processes which was used in this study is a thresholding algorithm, applied on C.T. images, used to detect unhealthy tissues (tumor and stone). The results showed that the system is able to distinguish between different tumors of the kidney of cases mentioned above. It's important for the instructor to determine the area of the tumor and stone to avoid damaging the healthy tissue during the treatment. The histogram which was used to study the differences between the healthy and unhealthy depending on the intensity of the image