Article
Optics
Shahad S. Khudiar, Uday M. Nayef, Falah A. H. Mutlak
Summary: The study synthesized Zinc Oxide (ZnO) nanoparticles using pulsed laser ablation and prepared porous silicon layers using the PECE method. The adhesion between ZnO NPs and PS was found to be good, enhancing the structural stability of the PS substrate. Detector measurements showed that ZnO NPs/PS had a higher responsivity of 0.04 A/W.
Article
Chemistry, Physical
Karolina Gawlak, Dominika Popiolek, Marcin Pisarek, Grzegorz D. Sulka, Leszek Zaraska
Summary: This study presents an effective strategy for enhancing the photoelectrochemical activity of nanoporous tin oxide films by sensitizing them with a narrow band gap semiconductor, CdS. The nanoporous structure of tin oxide films is retained after CdS deposition, and the thermal treatment at 200 degrees C is found to be crucial for optimal photoresponse.
Article
Engineering, Electrical & Electronic
Hind Kh. Abbas, Alwan M. Alwan, Amer B. Dheyab
Summary: This study presents a novel approach to enhance the performance of CNTs/porous Si gas sensors by incorporating AuNps into the structure. The results showed that the addition of AuNps shortened the decay time of the sensor by 49% and increased the sensitivity by 39.5%. These improvements can be attributed to the increased surface area and thermal conductivity of the sensing layer due to AuNps.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Shuai Guo, Xuefeng Wang, Xiaoyu Zhao, Dieter Weller, Yingying Wang, Jie Jiang, Ruibin Liu
Summary: Nanostructures with controllable emission colors have great potential for high throughput sensing, anti-counterfeiting, and information security. This study proposes a branched CdS nanostructure with Sn nanoparticles to construct lateral photonic barcodes. The plasmon enhanced photoluminescence is observed due to the encapsulated Sn nanoparticles. However, the cathodoluminescence at the junctions is quenched due to the transfer process between CdS and Sn nanoparticles. The temperature and pump laser power can effectively modulate the emission color and coding capacity of the CdS branched barcodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Eman M. Sulaiman, Uday M. Nayef, Falah A-H Mutlak
Summary: Colloidal nanoparticles of Au:Cd were prepared via laser ablation and deposited on porous-Si. The highest responsivity of the Au:Cd NPs/PS photodetector was found to be at a laser energy of 800 mJ/pulse, possibly due to the smaller particle size and larger surface area.
MATERIALS TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Anas A. M. Alqanoo, Naser M. Ahmed, Md. R. Hashim, Munirah A. Almessiere, Sofyan A. Taya, Ahmed Alsadig, Osamah A. Aldaghri, Khalid Hassan Ibnaouf
Summary: The applications of silver nanowires (AgNWs) depend on their purity and morphology. In this study, the morphological changes of AgNWs during growth were tracked to determine the optimal reaction time and temperature. UV-Vis absorption spectra were used to investigate the relationship between reaction time and temperature. An equation was developed to calculate reaction time at any given reaction temperature. The average diameter of the AgNWs was found to be temperature-dependent, with the minimum value observed at a reaction temperature of 150°C. A purification technique was conducted to remove by-products, and an AgNWs-based porous Si device was fabricated and showed high sensitivity and detectivity.
Article
Chemistry, Physical
Makram A. A. Fakhri, Ali A. A. Alwahib, Evan T. T. Salim, Raid A. A. Ismail, Husam Aldin A. Abdul Amir, Raed Khalid Ibrahim, Sarmad Fawzi Hamza Alhasan, Forat H. H. Alsultany, Zaid T. T. Salim, Subash C. B. Gopinath
Summary: In this article, GaN nanoparticles were synthesized using femtosecond pulse laser ablation in liquid (PLAL) and their photoluminescence and optoelectronics properties were investigated. The results showed that the synthesized nanoparticles at 532 nm exhibited better crystallinity. The porous silicon consisting of semicircular pores with an average diameter of 20 μm was observed through field emission electron microscope (FE-SEM). The optoelectronic properties of GaN/PSi were also studied, confirming its feasibility for double-junction photodetector and other applications. The maximum responsivity of the photodetector fabricated at 532 nm laser wavelength was 3.8 A/W at 330 nm.
Article
Nanoscience & Nanotechnology
Meng Yuan, Mingkun Zhang, Zhao Fu, Shan Han, Yuning Zhang, Shaoxiong Wu, Rongdun Hong, Xiaping Chen, Jiafa Cai, Dingqu Lin, Zhengyun Wu, Baoping Zhang, Jicheng Wang, Feng Zhang
Summary: A significant enhancement in ultraviolet (UV) detection is achieved by etching microhole arrays and utilizing localized surface plasmon resonance (LSPR) of aluminum nanoparticles (NPs) on 4H-SiC metal-semiconductor-metal (MSM) photodetectors (PDs). The PDs with different microhole diameters demonstrate an ultralow dark current at a bias of 5V. The PD with 3μm microholes shows the best performance with a responsivity 35% higher than the device without microholes. The combination of 3μm microholes and aluminum NPs results in a nearly 6 times enhancement in peak responsivity compared to the device without aluminum NPs.
ACS APPLIED NANO MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Asmaa Kadim Ayal, Ahlam Mohammed Farhan, Araa Mebdir Holi, Asla Abdullah Al-Zahrani, Ying-Chin Lim
Summary: The influence of manganese concentration on the deposit of Mn nanoparticles on CdS nanoparticles as a sensitizing coat in photoelectrochemical applications was investigated. The successful incorporation of Mn nanoparticles within CdS nanoparticles and TiO2 nanotubes was achieved by diverse characterization techniques. The optimal combination was found to be 7 mM of Mn deposited onto CdS/TiO2 nanotube, which improved the photoelectrochemical performance by increasing absorption in the visible region.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Abdelazim M. Mebed, Alaa M. Abd-Elnaiem, Wim De Malsche
Summary: This study investigates the influence of electrochemical etching parameters on porous silicon formation, offering a fundamental understanding that may be utilized in nanotechnology applications. The research confirms that the anodization rate increases with increasing steady-state current, emphasizing the importance of adjusting the anodizing potential for desired outcomes.
Article
Nanoscience & Nanotechnology
Shusen Lin, Md. Ahasan Habib, Shalmali Burse, Rutuja Mandavkar, Tasmia Khalid, Mehedi Hasan Joni, Ming-Yu Li, Sundar Kunwar, Jihoon Lee
Summary: A novel hybrid UV photodetector (GQD/ZnO/AHNP PD) is demonstrated using AuPt alloy hybrid nanoparticles, ZnO quantum dots, and graphene quantum dots, achieving high performance with a responsivity of 2299 mA/W, detectivity of 7.04 x 1010 jones, and external quantum efficiency of 741%.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Nilem Khaliq, Muhammad Asim Rasheed, Maaz Khan, Muhammad Maqbool, Mashkoor Ahmad, Shafqat Karim, Amjad Nisar, Patrik Schmuki, Sung Oh Cho, Ghafar Ali
Summary: A hybrid nanostructure electrode based on Au/CdS QDs/TNTs was fabricated for nonenzymatic detection of cholesterol and hydrogen peroxide, showing enhanced sensitivity and selectivity. The biosensor demonstrated good reproducibility and thermal stability, with promising potential for enzyme-free biosensing applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Byungji Kim, Qinglin Yang, Leslie W. Chan, Sangeeta N. Bhatia, Erkki Ruoslahti, Michael J. Sailor
Summary: Immunotherapy offers a broad-spectrum therapeutic solution against bacterial infections by deterring antibiotic-resistant strains and minimizing the need for new pathogen-specific antibiotics. Targeted nanoparticles loaded with siRNA against the Irf5 gene show promise in improving therapeutic outcomes by effectively silencing the gene in activated macrophages.
NANOSCALE HORIZONS
(2021)
Article
Optics
Duha H. Jwied, Uday M. Nayef, A. H. Mutlak
Summary: C:Se (core:shell) nanoparticles are produced through laser ablation and deposited on porous silicon. The nanoparticles exhibit crystalline structure and a rod-like shape, showing promising performance on photodetectors. The study also determines electrical characteristics of heterojunctions and the efficacy of the photodetectors.
Article
Chemistry, Multidisciplinary
Maxim B. Gongalsky, Nikolay V. Pervushin, Daria E. Maksutova, Uliana A. Tsurikova, Pavel P. Putintsev, Oleg D. Gyuppenen, Yana V. Evstratova, Olga A. Shalygina, Gelina S. Kopeina, Andrey A. Kudryavtsev, Boris Zhivotovsky, Liubov A. Osminkina
Summary: The optical monitoring of sol- and por-SiNP biodegradation revealed that sol-SiNP gradually dissolved over 20 days, while por-SiNP rapidly dissolved within 24 hours. Analysis of Raman and PL showed the low cytotoxicity of SiNPs towards cells, providing valuable insights for the development of biodegradable drug delivery systems based on SiNPs.
Article
Chemistry, Physical
Raid A. Ismail, Evan T. Salim, Marwa S. Alwazny
Summary: Au@LiNbO3 core/shell nanoparticles were successfully synthesized by laser ablation in ethanol without using a catalyst. The size of the nanoparticles depended on the laser fluence. The optical properties of the core/shell nanoparticles varied with laser fluence. The best core/shell characteristics and photodetector performance were achieved at a laser energy of 2 J/cm(2).
Article
Chemistry, Physical
Hasan A. Hadi, Sarab T. Kasim, Fadhil K. Farhan, Raid A. Ismail, Nadir F. Habubi
Summary: This study reports on the thermal properties of nanostructured silicon prepared by a laser-assisted electrochemical method. The main thermal properties of porous silicon were measured using the non-destructive approach of C-Therm TCi(TM). The effect of porosity on the thermal properties of porous silicon layers was investigated, with etching time as the primary parameter. The results show that the porosity and thickness of the porous silicon layer increase with increasing etching time.
Article
Physics, Multidisciplinary
Mayyadah H. Mohsin, Khawla S. Khashan, Ghassan M. Sulaiman
Summary: In this paper, hexagonal BN, Gd2O3 nanoparticles, and BN@Gd2O3 hybrid nanocomposites were synthesized by novel laser ablation in liquid. Various analytical techniques were used to investigate their structural and optical properties. The results showed the formation of h-BN NPs, sheet-like and spherical nanoparticles, hexagonal-type nanoflake of Gd2O3, and needle-like shapes. The optical energy gap of h-BN, Gd2O3, and h-BN@Gd2O3 was found to be in the range of (4.5-5.5) eV.
Article
Chemistry, Physical
Susan Hasan, Khawla S. S. Khashan, Aseel A. A. Hadi
Summary: In this study, Pd@Ag(core/shell) nanoparticles were synthesized using Q-switched Nd:YAG laser at a wavelength of 1064 nm in distilled water. The synthesized nanoparticles were characterized by various techniques, including UV-visible spectrophotometry, FT-IR, XRD, TEM, and EDS. The results showed that the Pd@Ag core-shell nanoparticles exhibited excellent antibacterial activity, especially against Gram-positive pathogens. The use of PLAL-prepared Pd@Ag core-shell nanoparticles as antimicrobial agents shows promising potential.
Article
Chemistry, Physical
Salah S. Hamd, Asmiet Ramizy, Raid A. Ismail
Summary: The effect of laser fluence on the properties of boron carbide nanoparticles synthesized via pulsed laser ablation in ethanol was studied. It was found that the laser fluence affected the morphology, size, and optical properties of the nanoparticles. Furthermore, the fabrication and characterization of BxC NPs/SiO2/Si heterojunction photodetectors were demonstrated.
Article
Chemistry, Physical
Suaad S. Shaker, Raid A. Ismail, Ban K. Mohammed
Summary: High-performance photovoltaic devices with core-shell structures can be obtained by optimizing the preparation conditions. This study used laser ablation in liquid to fabricate graphene oxide@ZrO2/p-Si heterojunction photodetectors and investigated the effect of an external magnetic field on the properties of the core-shell structure. The results show that the magnetic field can improve the crystallinity of the core-shell, increase the optical energy gap, and reduce particle aggregation.
Article
Optics
Ridha A. Hussein, Alwan M. Alwan, Allaa A. Jabbar
Summary: In this study, silver nanoparticles deposited on a silicon substrate were modified through laser ablation at a fixed laser fluence. Different laser pulse repetition rates were utilized to synthesize hybrid structure silver nanoparticles/Silicon AgNPs/Si via laser ablation process. Four types of superficial hybrid structures were observed under a fixed laser thermal of 600 mJ/cm(2) with pulse repetition rates of 250, 300, 350, and 400, respectively. The structural and optical properties of the hybrid structure were found to be highly dependent on the laser irradiation process. The highest specific surface area was achieved at a pulse repetition rate of 350 due to the smaller sizes of the silver nanoparticles.
JOURNAL OF OPTICS-INDIA
(2023)
Article
Physics, Condensed Matter
Ali M. Muhammed Ali, Faris M. Ahmed, Raid A. Ismail, Makram A. Fakhri, Evan T. Salim, Khawla S. Khashan
Summary: This study investigates the effect of molar concentration on the structural, optical, and electrical properties of nanostructured CdS film prepared by chemical bath deposition. The results demonstrate that the energy gap of CdS increases with increasing molarity, and the optoelectronic properties of CdS/Si heterojunction photodetectors are also influenced by molar concentration.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Multidisciplinary Sciences
Makram A. Fakhri, Haneen D. Jabbar, Mohammed Jalal Abdulrazzaq, Evan T. Salim, Ahmad S. Azzahrani, Raed Khalid Ibrahim, Raid A. Ismail
Summary: In this study, GaN thin films were deposited on porous silicon substrates via pulsed laser deposition at different substrate temperatures. The structural and optical properties of the films were investigated. The results showed that the GaN/PSi photodetector prepared at 300°C exhibited the best performance.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Evan T. Salim, Wafaa K. Khalef, Makram A. Fakhri, Rawan B. Fadhil, Ahmad S. Azzahrani, Raed Khalid Ibrahim, Raid A. Ismail
Summary: Lithium niobite (LiNbO3) nanostructures were synthesized using chemical bath deposition method and decorated with silver nanoparticles (AgNPs) using UV activation method at different immersion durations. The effects of AgNPs on the optical and structural properties were studied and analyzed. XRD results showed a hexagonal structure with a maximum diffraction peak at (012) for all samples, and the existence of silver atoms at 2θ = 38.2° corresponding to the (111) diffraction plane. The optical absorption revealed the presence of a plasma peak related to silver at 350 nm and a reduction in the energy gap with the presence of Ag atom. PL peaks were observed in the visible region of the electromagnetic spectrum, and SEM and AFM studies showed changes in particle morphology and surface roughness with increasing immersion time. FT-IR exhibited an increase in peak intensity for samples decorated with AgNPs, while Raman spectroscopy showed a shift to higher intensity due to the plasmonic effect of Ag nanoparticles. Ag-LiNbO3/Si heterojunction nano-devices were fabricated successfully and showed enhanced optoelectronic properties compared to the pure LiNbO3/Si heterojunction device.
SCIENTIFIC REPORTS
(2023)
Review
Nanoscience & Nanotechnology
A. S. Najm, Vidhya Selvanathan, Thaar M. Aljuwaya, Laith S. Sabri, M. S. Jamal, Asla Abdullah Al-Zahrani, Araa Mebdir Holi, Israa Jaber, Ahmed Al Ghamdi, Majdi T. Amin, K. Sopian, Raid A. Ismail, Hazim Moria, Badariah Bais, Hasan Sh Majdi, Shahariar Chowdhury, Abbas J. Sultan, Thaqal M. Alhuzaymi
Summary: This article reviews the methods of sensitizing solar cells and discusses the strategies and prospects of quantum dot solar cells. It provides technical support and a theoretical basis for improving industrial applications and performance.
Article
Materials Science, Multidisciplinary
Russul M. Shehab, Alwan M. Alwan
Summary: In this study, three different types of hybrid structures SERS sensors were created using different mixing ratios of trimetallic (Ag-Au-Pd) nanoparticles. The sensors demonstrated a considerable reliance on hot spot zones among trimetallic nanoparticles. The study also showed that the variations of mixing ratio of trimetallic (Ag-Au- Pd) provide an effective pathway to develop the sensors performance towards detection of lower concentrations.
INTERNATIONAL JOURNAL OF NANOELECTRONICS AND MATERIALS
(2023)
Article
Physics, Multidisciplinary
Rasha B. Rashid, Alwan M. Alwan, Mohammed S. Mohammed
Summary: This study compared the effect of two specific forms of Si nanocrystallites structures (Si quantum dots and horizontally oriented Si nanopillars on the performance of electrically matched impedance pesticides sensor. The aim was to develop effective, simple, and low-cost electrical sensors for the quantitative detection process of Chlorpyrifos pesticide. Si quantum dots and H_Si nanopillars/etched Si electrical sensors with two front coplanar electrodes configuration were adopted and studied. The obtained results showed high sensitivity, low limit of detection, and good stability for both SiQDs and H_Si nanopillars structures.
INDIAN JOURNAL OF PHYSICS
(2023)
Article
Agriculture, Multidisciplinary
Mohammed M. A. Alrawi, Mohammed . Z. K. Al-Mharib, Abbas M. Alwan, Ahmed R. Naser
Summary: The experiment conducted in the winter season of 2019-2020 at the fields of the Directorate of Seed Testing and Certification aimed to study the effects of foliar application of different levels of magnesium and boron on the yield and seed quality of broad bean genotype LUZ DE OTONO. Results showed that applying magnesium at a concentration of 1 g.l-1 and boron at a concentration of 100 mg.l-1 improved dry seed yield and various seed characteristics. It is recommended to use foliar application of magnesium at 1 g.l-1 and boron at 100 mg.l-1 to enhance yield and seed quality.
IRAQI JOURNAL OF AGRICULTURAL SCIENCES
(2023)
Article
Chemistry, Inorganic & Nuclear
Doaa Sulaiman, Alwan M. Alwan, Walid K. Hamoudi
Summary: Si nano-columns were used as a SERS layer with fixed 20% laser pulse duty cycle and short laser wavelength (405 nm) at different laser power density values (300-600 mW/cm(2)). By adjusting the laser power density, the morphology of the silicon nano-columns layer and the performance of the SERS devices could be well-regulated, achieving excellent reproducibility and high enhancement factor for detecting ultra-low concentrations of chlorpyrifos pesticide.
