Characterisation of TiO<sub>2</sub> nanoparticles on porous silicon for optoelectronics application

Nayef, Uday M.; Hubeatir, Kadhim A.; Abdulkareem, Zahraa J.

doi:10.1080/10667857.2015.1132988

Cited by 38 publications

(4 citation statements)

References 15 publications

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“…The spectrum of TiO2 contains several absorption peaks as observed in Figure 3. The spectrum shows strong absorptions between 200 and 345 nm [43]. UV-vis absorption spectroscopy was used to track the formation of colloids.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Au:TiO2 Nanoparticles via Laser Ablation in Liquid Deposited on Porous-Si for Improved Spectral Responsivity

Suliman¹,

Nayef²,

Mutlak³

2022

JASN

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In this study, Au:TiO2 nanoparticles (NPs) are prepared by using the laser ablation method in liquid at different laser energies (600, 800, and1000 mJ). After that, Au: TiO2 NPs were deposited on porous-Si(PS). Porous silicon (PS) is synthesized by using the photoelectrochemical etching (PECE) of n-type crystalline Si (c-Si) wafers of (100) orientation. The intensity of the etching current density was (4, 12, and 20 mA/cm 2 ), with 16% (HF), and the etching time was 15 minutes. The X-ray diffraction (XRD) techniques, scanning electron microscopy (SEM), UV-visible spectrophotometry, and electrical properties are used to characterize the obtained particles. From the photo-detector measurements, the spectral responsivity curves three inclusive regions; the first peak was due to the absorption of UV light by Au: TiO2 NPs. The second peak was corresponding to the visible light absorption with the PS layer and the third peak was due to the absorption edge of the Si substrate. The higher responsivity of Au: TiO2 NPs/PS photo-detector was found to be 2.56A/W for specimens prepared at laser energy 800mJ.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Au:TiO2 Nanoparticles via Laser Ablation in Liquid Deposited on Porous-Si for Improved Spectral Responsivity

Suliman¹,

Nayef²,

Mutlak³

2022

JASN

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“…The growing resistance of microbial organisms to multiple antibiotics, combined with the continued emphasis on healthcare costs, has prompted researchers to create new antimicrobial substances that are effective against drug resistance [1]. Metal nanoparticles' antibacterial activity has been linked to their small size and high surface-to-volume ratio, encouraging them to interact directly with microbial membranes rather than simply because metal ions are released through solutions [2,3]. Zinc oxide nanoparticles (ZnO NPs) have piqued the interest of researchers due to their intriguing physical and chemical properties [4,5].…”

Section: Introductionmentioning

confidence: 99%

Study the Effect of Laser Wavelength on ZnO Nanoparticle Characteristics Synthesized by Pulse Laser Ablation as an Antibacterial Application

Imran¹,

Hubeatir²,

Aadim³

2022

ETJ

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 Synthesis of ZnO nanoparticles was performed using PLAL with different wavelengths  The study and characterization of the ZnO nanoparticle were achieved.  The antibacterial activity of ZnO was studied on coli and S. aurous.  The nanomaterials were proved to have good biocompatibility and antibacterial properties.In recent years, biologists, chemists, materials scientists, and engineers have become interested in Nano-sized particles because of their unique properties. In this paper, ZnO nanoparticles were synthesized using an Nd: YAG laser with 800 mJ at 1064 nm and 532 nm (the fundamental and second harmonic wavelengths). The characteristics of optical, morphological, structural, wettability and antibacterial activity have been studied. The used technique of PLAL was successful in nanoparticle formation. It was proved in color changes, which was an indication of ZnO nanoparticle formation. The optical measurements show a decrease in absorption wavelength and an increase in the band gap, an indication of the formation of quantum confinement due to nanoparticle formation. The XRD involves the formation of polycrystalline ZnO at both wavelengths. Also, the FE-SEM proved the formation of nanoparticles with a semispherical shape and little agglomeration on the surface. However, the EDX shows Zn and O in the film, which means the formation of ZnO. The low contact angle indicates high wettability, which means that the material has high biocompatibility. Finally, the antibacterial test was done on two types of bacteria (E. coli and S. aurous) and showed an antibacterial effect on both types with different NP concentrations.

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“…The anodization process requires constant current source, anodization cell and its inability to process large area PS layers [6]. The terms 'anodic etching' and 'anodization' are used to describe pore formation because the semiconductor acts as the anode in the electrochemical reaction in which silicon atoms are separated from the crystal [7].…”

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Fabrication and characterization of porous silicon for humidity sensor application

Nayef¹

2019

IJP

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Porous Silicon (PS) layer has been prepared from p-type silicon by electrochemical etching method. The morphology properties of PS samples that prepared with different current density has been study using atom force measurement (AFM) and it show that the Layer of pore has sponge like stricture and the average pore diameter of PS layer increase with etching current density increase .The x-ray diffraction (XRD) pattern indicated the nanocrystaline of the sample. Reflectivity of the sample surface is decrease when etching current density increases because of porosity increase on surface of sample. The photolumenses (PL) intensity increase with increase etching current density. The PL is affected by relative humidity (RH) level so we can use as humidity sensor. The electrical resistivity has been increased after PS layer formed due to the variation of the pore size and it was much higher after increase etching current.

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Characterisation of TiO₂ nanoparticles on porous silicon for optoelectronics application

Cited by 38 publications

References 15 publications

Synthesis of Au:TiO2 Nanoparticles via Laser Ablation in Liquid Deposited on Porous-Si for Improved Spectral Responsivity

Synthesis of Au:TiO2 Nanoparticles via Laser Ablation in Liquid Deposited on Porous-Si for Improved Spectral Responsivity

Study the Effect of Laser Wavelength on ZnO Nanoparticle Characteristics Synthesized by Pulse Laser Ablation as an Antibacterial Application

Fabrication and characterization of porous silicon for humidity sensor application

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Characterisation of TiO2 nanoparticles on porous silicon for optoelectronics application

Cited by 38 publications

References 15 publications

Synthesis of Au:TiO2 Nanoparticles via Laser Ablation in Liquid Deposited on Porous-Si for Improved Spectral Responsivity

Synthesis of Au:TiO2 Nanoparticles via Laser Ablation in Liquid Deposited on Porous-Si for Improved Spectral Responsivity

Study the Effect of Laser Wavelength on ZnO Nanoparticle Characteristics Synthesized by Pulse Laser Ablation as an Antibacterial Application

Fabrication and characterization of porous silicon for humidity sensor application

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Characterisation of TiO₂ nanoparticles on porous silicon for optoelectronics application