The spectral responsivity improvement of Au@TiO2 via magnetic-field assisted laser ablation

The aim of this research study is the effect external magnetic field on the structural, morphological, electrical and optical properties of Au@TiO2 films grown under various laser pulse energy 500, 660, and 820 mJ/pulse, as well as its potential for photodetector application. This process was carried by second harmonic 532 nm a Q-switching Nd:YAG laser. X-ray diffraction indicates the formation of a creation crystalline Au@TiO2 core shell through the existence of XRD peaks associated with Au and TiO2 NPs, with no structural changes after applying a magnetic field. In the case of applying a magnetic field, TEM demonstrates the creation of spherical Au@TiO(2)NPs, with reduced agglomeration and particle size from 27 to 17 nm. The optical properties revealed that the optical energy gap of Au@TiO(2)NPs was 3.6 eV at the B = 0 T eV, while the energy gap increased under the influence of effect of magnetic field through the process of ablation. The current-voltage characteristics of Au@TiO2/PS photodetectors were measured in the dark conditions. The maximum responsivity of the Au@TiO2/PS photodetector was 0.16 A/W at 450 nm while this responsive decreasing to 0.04 A/W after applying the magnetic field through the ablation process. Au@TiO(2)NPs appear to be a potential candidate for high-performance photo-detector applications.

Automated summary

The aim of this research is to study the effects of an external magnetic field on the properties of Au@TiO2 films and its potential application as a photodetector. The results showed that the morphology, size, and optical energy gap of the Au@TiO2 nanoparticles were affected by the magnetic field, while the structural properties remained unchanged. The study also suggests that Au@TiO2 nanoparticles could be a promising candidate for high-performance photodetector applications.