Synthesis and Characterization of AuNP/TiO₂ Hybrid Nanoparticles for Possible Photocatalytic Application

Abstract

Nanoparticles have been intensively studied due to their unique, size-dependent properties, paving the way for various applications, particularly in photocatalysis. This study aims to determine the physicochemical characteristics of TiO2 and Au nanoparticles and the AuNP/TiO2 hybrid nanoparticles. Employing multiple characterization techniques, the structural and functional parameters were elucidated. The Brunauer-Emmett-Teller (BET) surface area analysis revealed the pore sizes of TiO2 and the Au/TiO2 hybrid nanoparticles as 12 nm and 18 nm, respectively. The Dynamic light scattering (DLS) measurements revealed the hydrodynamic size of the AuNP/TiO2 hybrid nanoparticles at 386 nm. The UV-visible spectroscopy showed the absorbance peaks associated with their electronic structures and potential photocatalytic applications. The fast Fourier infrared (FTIR) spectroscopy results revealed the surface molecular interactions crucial for nanoparticle functionalities. The AuNP/TiO2 hybrid nanoparticles exhibit a larger pore size compared to TiO2NPs, indicating their superior adsorption capability. Moreover, the unique band gap of TiO2NPs and electron-hole pair generation make it a formidable candidate for photocatalysis. The incorporation of AuNPs may further augment charge separation, optimizing photocatalytic activity. These findings spotlight the promise of these AuNP/TiO2 hybrid nanoparticles in possible photocatalytic applications.