Papers by Keyword: PLD

Abstract: For solar collectors to be more durable and effective in renewable energy applications, surface enhancement is essential. The limited hardness and wear resistance of conventional aluminum alloys, including Al-6063, impair their long-term performance. By employing the pulsed laser deposition (PLD) technology to produce AlO₃ nano-coatings, this study seeks to overcome these constraints. The goal of this research is to use nanostructuring to improve the mechanical characteristics, resistance to corrosion, and optical performance of solar collectors. The surface of the solar collector alloy was coated with a nano- material (Al2O3) that had a particle size of 30 ± 5 nm. An Al2O3 nano material coating's micro-structure, phase composition, and effects were examined. PLD was applied to reduce erosion and corrosion and improve the mechanical performance of the aluminum alloy (AL-6063) used on the solar collector's surface. Using PLD, a 10 μm layer of aluminum dioxide was applied to the aluminum alloy's surface to ensure high hardness and a long fatigue life. Hardness testing on the samples showed an improvement in the alloy mechanical characteristics. Before and after deposition, an energy-dispersive X-ray spectroscopy test was carried out. The mechanical characteristics improved after an Al2O3 Nano layer was deposited. The samples' hardness increased from 626 HLD to 672 HLD, and erosion and corrosion decreased. Because of the Nano layer applied via PLD, the atomic percentage of oxygen deposited on the surface of the solar collectors changed between 8.3% and 9.4%, the roughness (x) decreased from 738 µm to 309 µm and the reflection ratio decreases. These outcomes confirm that PLD-deposited Al₂O₃ coatings improve the durability and efficiency of solar collectors, offering a promising solution for future renewable energy systems.

Abstract: Thin films of ZnMn₂O₄ were deposited on quartz substrates at 250 °C using the Pulsed Laser Deposition (PLD) technique and then annealed in air at 500 °C for 6 hours. The films were tested for detection of NO₂ and NH₃ at different operating temperatures. The films showed rapid response time is (7.2 s) for NO₂ and (13.5 s) for NH₃ at 300 °C. The upper sensitivity of NH₃ is 15%, while the upper sensitivity of the samples tested with 60ppm NO₂ is 93% at a temperature of around 300°C. Also, the structural properties as X-ray diffraction ( XRD), Field emission scanning electron microscopy (FESEM), and optical properties were studied. Keywords: Gas sensors, pulse laser deposition, PLD, ZnMn₂O₄, Sensing properties, optical properties.

Abstract: Two AISI (316,304) stainless steel alloys were utilized in this work to enhance the surface properties and corrosion inhibiters with Al₂O₃ nanoparticles which was generated via pulse laser deposition (PLD). Alumina as biomaterial for dental purposes was prepared using the co-precipitation process and analysis by X-Ray diffraction. Alumina has drawn a lot of interest and is historically well-accepted .SEMs, and EDS, been used to describe researchers have studied the coating morphology. Roughness and Vickers hardness were utilized to quantify the surface modifications as part of an investigation into corrosion prevention employing mechanical properties submerged in saliva with a PH (5.6). When compared to bare AISI (316,304) stainless steel, all samples exhibit greater corrosion resistance.

Abstract: This paper presents the results of factorial experiment applied to optimize Matrix‑Assisted Pulsed Laser Evaporation (MAPLE) and Pulsed Laser Deposition (PLD) coating technologies used to improve the corrosion resistance of steels. MnTa₂O₆ pseudo-binary oxides and 5,10-(4-carboxy-phenyl)-15,20-(4-phenoxy-phenyl)-porphyrin was used for these experiments to obtained thin film coating system of hybrid nanostructures. Based on factorial experiments, correlations between the main technological parameters of the coating process (MAPLE laser energy E_MAPLE [mJ], PLD laser energy E_PLD [mJ]) and porphyrin concentration and the main related property of the coating system (corrosion protection factor) were determined. The base material used as substrate in the experiments was S235JR+C. Electrochemical measurements showed that by applying the appropriate parameters of the coating technologies, homogeneous layered sandwich thin films were obtained and corrosion rate was reduced by more than 7 times.

Abstract: A single-step of pulsed laser deposition method was used to manufacture (Cu₂O) cuprous oxide nanothin films on Silicone substrates at low growing temperature in this study. The effects of three parameters of pulsed laser energies (800-1200 mJ) was used to explored in order to maximize the structural and morphological quality. (XRD) X-ray diffraction, Scanning electron microscopy with field emission (FESEM), and Atomic force microscopy were used to evaluate the effects of laser pulsed energies on the characteristics of Cu₂O nanofilms (FESEM). When compared to a crystalline silicon surface, the results of AFM show a higher possibility of better absorption and hence lower reflection.

Abstract: The deposition of copper oxide utilizing a pulsed laser deposition technique employing a reactive pulsed laser as a deposition technique is the subject of this study. The wavelength of the pulsed lase used are 1064 nm, the pulse duration is 10 ns, the laser energy of 1000 mj with different substrate temperatures (200, 3300, and 400 oC). The influence of the substrate tampering on the morphological, structural, Photolumencence, and the electrical, and attributes of the fabricated solar cell was recorded and studied using a high purity cupper target and deposited on porous silicon substrates. When compared to a crystalline silicon surface, the results of AFM show a higher possibility of better absorption and hence lower reflection. The presented results revealed the properties of the fabricated solar cell as well as a noticeable improvement in the solar cell's efficiency, whether copper deposition was used or not. The deposited films at 1064 nm were monoclinic structures with a preference for the (111) direction, according to X-ray diffraction (XRD) examination. SEM were used to study the production of nanostructures on the substrate's surface, which led to the formation of small-sized and nanostructured films.

Abstract: The deposition of copper oxide utilizing a pulsed laser deposition technique employing a reactive pulsed laser as a deposition technique is the subject of this study (RPLD), 1064 nm, 10 Nanosecond Q-switch Nd-YAG laser with 350 °C, and 800-1200 mJ energies of laser was used to deposited a high purity target of Cupper and deposited on the quartz substrates synthesized and study the laser energies effect on the optical and photoluminescence properties.

Abstract: Oxidation is one of the main degradation mechanisms that affects most industrial components. Stainless steels are used in components and equipment in the chemical and petrochemical industries (e.g., valves, plates, columns, capacitors and desalination units). Generally, the steels used in these applications have physical, mechanical and chemical properties that give them corrosion resistance. However, contaminants existing in the processed fluids are the main factor causing the increase in corrosion rate, leading to significant financial losses, which requires the development of innovative technologies to protect the metal from the action of aggressive environment. The paper presents two innovative surface protection techniques used to improve the corrosion resistance of stainless steels. Thus, Matrix-Assisted Pulsed Laser Evaporation (MAPLE) and Pulsed Laser Deposition (PLD) techniques are used to obtain deposition of hybrid nanostructures of binary oxides and porphyrins on W1.4034 martensitic stainless steel, according to EN 10083-3.

Abstract: Nanocarbon structures such as graphene (GR), single-walled carbon nanotubes (SWCNTs) as well as the multi-walled carbon nanotubes (MWCNTs) were deposited on crystalline n-type silicon wafers to fabricate nanoCarbon-Si solar cells. Nanocarbon films deposited on glass and porous silicon (PS) via pulse laser deposition (PLD) with the use of Q-Switching Nd: YAG laser with λ=1064 (nm), Energy (E)=700 (mJ), Repetition rate (f)=6 (HZ) under vacuum condition with 2.5×10^-2 (mbar). The surface morphology, structure, and optical Nanocarbon thin films have been examined with the use of X-ray Diffraction (XRD), Atomic force microscope (AFM), FTIR spectrophotometer and UV-visible. In addition, the power conversion efficiency that is related to the prepared solar cells is estimated through J-V characterization. The PCE of all Nanocarbon/PS follows the orders; SWCNTs/PS < MWCNTs/PS< GR/PS.

Abstract: The optical and electric transport properties of the Al:ZnO(AZO) and (Cu, Al):ZnO (CAZO) films deposited by pulsed laser deposition (PLD) were investigated in this paper. The experiment found the optical band gap (OBG) of AZO films at room temperature increased from 3.378eV of ZnO to 3.446eV of ZnO:Al (2min) sample, but decreased as continue add Al to ZnO:Al (4min), which were attributes to the Burstein-Moss (B-M) effect. For CAZO films, there is obvious change about hall mobility, ν, and resistivity, ρ, after doped Cu. It can be found that the ν decreased from to and the ρ increased from to for AZO and CAZO, respectively, which is due to the scattering increasing between donor carriers and grain boundary as Cu²⁺ ions increase, meanwhile, it was also found the decrease of OBG, which are very help to further understand the electric transport properties and the OBG effect of AZO-based films as well as its devices potential application.