Synthesis of Au@NiO (Core@Shell) Nanoparticles via Laser Ablation on Silicon Nanostructures for Photodetector Application

AbstractThe synthesis of Au@NiO nanoparticles (NPs) core –shell involves a two-step method via laser ablation in aqueous solutions. Meanwhile, porous silicon is obtained using photoelectrochemically etching (PECE) of n-type silicon. The nanostructured Au@NiO deposited on a porous silicon layer is demonstrated using field-emission scanning electron micro scopy images, X-ray diffraction, and UV–vis absorption measurements. The creation of core–shell structure in Au@NiO nanoparticles was confirmed using X-ray diffraction, EDS, and UV–visible spectroscopy techniques. X-ray diffraction investigation indicates that the structures of Au and NiO exhi bit a cubic shape oriented in the (111) direction. The optical band gap of Au@NiO nanoparticles decreased as laser energy increased. The Al/Au@NiO NPs/PS/n-Si/Al photodetector prepared at a laser energy of 700 mJ showed a responsivity of 0.105A/W and low reflectivity. Furthermore, the designed photo detector displayed a broad response range covering many effective regions, ranging from ultraviolet to infrared. The findings of this work are highly significant for the progress of photoresponse and optoelectronic devices that depend on core–shell Au-NiO nanoparticles and porous silicon.
Source: Plasmonics - Category: Biomedical Science Source Type: research