Study Effect of Magnetic Field on Au-TiO2 Core–Shell Nanoparticles via Laser Ablation Deposited on Porous Silicon for Photodetector

• Published in: Plasmonics (Norwell, Mass.) Mass.), 2023-04, Vol.18 (2), p.595-605
• Main Authors: Jwar, Ahmad J., Nayef, Uday M., Mutlak, Falah A.-H.
• Format: Article
• Language: English
• Subjects: Ablation; Aluminum; Biochemistry; Biological and Medical Physics; Biophysics; Biotechnology; Chemistry; Chemistry and Materials Science; Core-shell particles; Energy gap; Gold; Heterojunctions; Laser ablation; Magnetic fields; Nanoparticles; Nanotechnology; Neodymium lasers; Photometers; Porous silicon; Quantum efficiency; Scanning electron microscopy; Semiconductor lasers; Titanium dioxide; X-ray diffraction; YAG lasers
• ISSN: 1557-1955; 1557-1963
• DOI: 10.1007/s11468-023-01791-3

Gold-titanium dioxide nanoparticles (Au-TiO 2 NPs) were synthesized via pulsed Nd:YAG laser ablation in the CTAB under the influence of an external magnetic field produced. Scanning electron microscopy (SEM), X-ray diffraction (XRD), UV–Vis spectroscopy, and transmission electron microscopy (TEM) have been utilized in order to analyze Au-TiO 2 NPs. The XRD pattern related to Au-TiO 2 NPs indicated that they have been polycrystalline and the specimens Au-TiO 2 were nanocrystalline. In the case when applying a magnetic field, spherical NPs are generated, particle agglomeration is reduced, and particle size declines from 31 to 25 nm, according to SEM. Following ablation with a magnetic field, the optical energy gap of Au-TiO 2 NPs increased from 3.5 to 3.7 eV. With current density–voltage ( J-V ) measurements, the electrical parameters of Al/Au-TiO 2 /PS/Si/Al heterojunction, including the barrier height ( Φ B ) and ideal factor ( n ), were indicated. The efficiency regarding Au-TiO 2 /PS photodetectors has been enhanced over various wavelengths, quantum efficiency (QE) of Au-TiO 2 /PS photodetectors has been reduced after adding a magnetic field during the process of ablation.