An investigation on GaN/ porous-Si NO2 gas sensor fabricated by pulsed laser ablation in liquid

Amir, Husam Aldin A. Abdul; Fakhri, Makram A.; Alwahib, Ali Abdulkhaleq; Salim, Evan T.; Alsultany, Forat H.; Hashim, U.

doi:10.1016/j.snb.2022.132163

Cited by 18 publications

(5 citation statements)

References 76 publications

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“…Table 2 shows the energy band gap values at each laser energy, as the particle size reduced at 1600 mJ the energy gap increased due to the quantum confinement, as the laser energy increased the higher energy band gap observed with a total blue shift [48][49][50].…”

Section: Resultsmentioning

confidence: 99%

Optical Investigation of In2O3/ Quartz Nano-films Deposited at Different Laser Energies

Dua’a R. T. Alrayyes,

Ali A. Alwahib,

Makram A. Fakhri

et al. 2024

IJNeaM

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The study conducted in this research focuses on the deposition of In2O3 thin films onto quartz substrates using the pulsed laser deposition technique (PLD). The importance of this study lies in the exploration of the optical properties of these thin films under varying laser energies (1200 mJ, 1400mJ, 1600mJ, 1800 mJ, and 2000 mJ), and the subsequent determination of their energy band gaps. In the pursuit of enhancing our understanding of In2O3 thin films, this research exhibits a direct relationship between the laser energy and laser band gap. It was discovered that the energy band gap of thin In2O3 films increased due to the increase in laser energy. This phenomenon resulted in an overall blue shift from the fundamental energy gap of In2O3 thin films. The significance of this study extends to potential applications in various fields. In2O3 thin films with tunable energy band gaps can find applications in optoelectronics, photovoltaic and other emerging technologies. This research not only contributes to the fundamental understandings of thin film properties but also offers a pathway for tailoring their characteristics for specific applications, thus advancing the field of materials science and engineering.

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Section: Resultsmentioning

confidence: 99%

Optical Investigation of In2O3/ Quartz Nano-films Deposited at Different Laser Energies

Dua’a R. T. Alrayyes,

Ali A. Alwahib,

Makram A. Fakhri

et al. 2024

IJNeaM

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“…Because of the agglomeration effect, the ablation at high laser fluences can also result in the formation of agglomerates, which are clusters of particles that are held together by weak van der Waals forces. As the laser fluence increases, the energy of the laser can cause these agglomerates to grow in size [58][59][60]. The average particle size was estimated and found to be 18, 22, 28, and 34 nm for samples synthesised at laser fluences of 1.3, 1.6, 2, and 2.2 J cm −2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation of LiNbO₃ nanoparticles by green synthesis laser ablation in water

Alwazny,

Ismail,

Salim

2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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The use of LiNbO3 nanoparticles in nonlinear applications is attractive and promising. The particle size and morphology of LiNbO3 are the key parameters affecting their application. In this study, spherical nanoparticles of lithium niobate were synthesised by nanosecond Nd:YAG laser ablation in water. The polycrystalline, rhombohedral structure of the synthesised LiNbO3 nanoparticles with x-ray diffraction experiments was verified. The bandgap energy of colloidal LiNbO3 nanoparticles varied between 4.25 and 4.9 eV based on the laser fluence, according to the optical characteristics. The photoluminescence (PL) reveals that the emission peaks are centered at 293, 300, 305, and 309 nm for samples prepared at 1.3, 1.6, 2.0, and 2.2 J cm−2/pulse, respectively. The transmission electron microscope investigation confirmed the formation of spherical nanoparticles with an average size ranging from 18 to 34 nm. Raman studies on nanoparticles synthesised at various laser fluences are being conducted.

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“…The extremely common semiconductor metal oxides used in optoelectronic devices include WO3, MoO3, SnO2, TiO2, and ZnO. Surprisingly, among all these, WO3 is used in many electronic devices due to its tunable properties of high thermal stability, visible-range optical absorption, surface morphology, and chemical composition 35 , 36 . Extensive research has been conducted on the plasmonic properties shown by silver (Ag) NPs, primarily owing to their exceptional performance relative to other surface plasmon resonance (SPR) metals throughout the visible region of the electromagnetic spectrum.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Ag@WO3 core–shell, an investigation at different concentrated environment employing laser ablation in liquid

Salim,

Saimon,

Muhsin

et al. 2024

Sci Rep

Self Cite

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In this study, silver-tungsten oxide core–shell nanoparticles (Ag–WO3 NPs) were synthesized by pulsed laser ablation in liquid employing a (1.06 µm) Q-switched Nd:YAG laser, at different Ag colloidal concentration environment (different core concentration). The produced Ag–WO3 core–shell NPs were subjected to characterization using UV–visible spectrophotometry, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive spectroscopy, electrical analysis, and photoluminescence PL. The UV–visible spectra exhibited distinct absorption peaks at around 200 and 405 nm, which attributed to the occurrence of surface Plasmon resonance of Ag NPs and WO3 NPs, respectively. The absorbance values of the Ag–WO3 core–shell NPs increased as the core concentrations rose, while the band gap decreased by 2.73–2.5 eV, The (PL) results exhibited prominent peaks with a central wavelength of 456, 458, 458, 464, and 466 nm. Additionally, the PL intensity of the Ag–WO3-NP samples increased proportionally with the concentration of the core. Furthermore, the redshift seen at the peak of the PL emission band may be attributed to the quantum confinement effect. EDX analysis can verify the creation process of the Ag–WO3 core–shell nanostructure. XRD analysis confirms the presence of Ag and WO3 (NPs). The TEM images provided a good visualization of the core-spherical shell structure of the Ag–WO3 core–shell NPs. The average size of the particles ranged from 30.5 to 89 (nm). The electrical characteristics showed an increase in electrical conductivity from (5.89 × 10−4) (Ω cm)−1 to (9.91 × 10−4) (Ω cm)−1, with a drop in average activation energy values of (0.155 eV) and (0.084 eV) at a concentration of 1.6 μg/mL of silver.

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An investigation on GaN/ porous-Si NO2 gas sensor fabricated by pulsed laser ablation in liquid

Cited by 18 publications

References 76 publications

Optical Investigation of In2O3/ Quartz Nano-films Deposited at Different Laser Energies

Optical Investigation of In2O3/ Quartz Nano-films Deposited at Different Laser Energies

Preparation of LiNbO₃ nanoparticles by green synthesis laser ablation in water

Mesoporous Ag@WO3 core–shell, an investigation at different concentrated environment employing laser ablation in liquid

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An investigation on GaN/ porous-Si NO2 gas sensor fabricated by pulsed laser ablation in liquid

Cited by 18 publications

References 76 publications

Optical Investigation of In2O3/ Quartz Nano-films Deposited at Different Laser Energies

Optical Investigation of In2O3/ Quartz Nano-films Deposited at Different Laser Energies

Preparation of LiNbO3 nanoparticles by green synthesis laser ablation in water

Mesoporous Ag@WO3 core–shell, an investigation at different concentrated environment employing laser ablation in liquid

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Preparation of LiNbO₃ nanoparticles by green synthesis laser ablation in water