Geometrical Optimization of TiO2-Noble Metal Grating for Enhanced Photocatalytic Activity and SPR Biosensor Application
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This work determines the optimization of 2D TiO2-noble metal thin film for its applications in photocatalysis and SPR (surface plasmon resonance) biosensing. The impact of noble metal thickness fixed on TiO2 is checked by using RF module in COMSOL Multiphysics. In this work, an optimal slit width of 400 nm is obtained, at which the absorption of light is enhanced due to the enhanced light matter interaction. Near- and far-field analysis is done to attain the optimized parameters. The optimized parameters are used for the photocatalytic degradation rates of organic pollutants like tetracycline (TC), methylene blue (MB), and phenol (Ph). The study examines the role of Ag layer thickness in photocatalysis. Experimental data align with simulations, indicating that a 160-nm Ag layer maximizes the degradation rate at 0.00692 per minute. This thickness optimizes charge transfer and amplifies surface plasmon resonance effects, crucial for efficient pollutant breakdown. Moreover, the SPR biosensor has been analyzed for the detection of bacteria in various liquid analytes. The maximum value of sensitivity is obtained as 2000 nm per refractive index unit (RIU), outperforming current SPR biosensors. The linear behavior between the variables confirms the biosensor’s precision in bacterial detection. This study contributes valuable insights into the design of TiO2-noble metal gratings for organic pollutant degradation and biosensor applications.

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