The Use of Tunable Optical Absorption Plasmonic Au and Ag Decorated TiO2 Structures as Efficient Visible Light Photocatalysts

Abstract

Exploring solar-excited heterogeneous photocatalysts by taking advantage of surface plasmon resonance (SPR) has drawn growing research attention. As it could help to pave the way for global sustainable development. The decoration of TiO2 particles with noble metals possessing SPR effects is regarded as one of the most effective solutions. The perfect match of the SPR absorption band with the spectrum of incident light is an essential factor for plasmonic enhancement. However, modifying with sole noble metal is often limited as it tunes wavelength of only several nanometers. To overcome this drawback, an alternative approach can be offered by decoration with more than one noble metal. For instance, Au-Ag co-decoration displays greatly adjustable, composition-dependent SPR agent over a broad range of the visible light spectrum (ca. from 415 to 525 nm). Hence Au-Ag complex is a remarkable candidate for tuning the photo adsorption of TiO2 from UV to visible light. This study presents a novel and tailored method for the fabrication of Au-Ag co-modified TiO2 particles, and how Au-Ag dependent SPR was applied as the visible light-responsive TiO2 based photocatalysts in a simple but reliable way. The fabricated Au-Ag co-decorated TiO2 (AuxAg(1−x)/TiO2) was characterized and proved to own excellent stability and large specific surface area. The optimization of these particles against the wavelength of maximal solar light intensity was confirmed by photo degradation of methylene blue under visible light radiation. This work may provide further insight into the design of TiO2-based composites with improved photocatalytic properties for environmental remediation and renewable energy utilization.

Accelerating the Design of Photocatalytic Surfaces for Antimicrobial Application: Machine Learning Based on a Sparse Dataset

“…The H 2 O 2 production may be sustained by incorporating a smaller amount of Au and Ag since k d is suppressed by reducing the loading while k f is less affected by the loading reduction. Interestingly, Yang et al recently reported the synthesis of the colloidal Au-Ag/TiO 2 , which shows an excellent photocatalytic efficiency for the degradation of methylene blue [40]. The Au-Ag loading ranged from 0.4 to 1.0 mol % and the maximal photoactivity was achieved by using Au 0.21 Ag 0.79 with NP = 0.82 mol % TiO 2 catalyst.…”

Solar-Powered Photodegradation of Pollutant Dyes Using Silver-Embedded Porous TiO2 Nanofibers

“…Besides being cheap and relatively abundant, they boast an intense SPR effect that can offer superior plasmonic enhancement to the TiO 2 photocatalyst. The combination has been subjected to a couple of dye degradation studies for this reason [ 27 , 28 , 29 ]. Meanwhile, one-dimensional (1D) nanofibers serve as an appealing architecture for this application, as they can be convenient for separation and recovery [ 30 , 31 ].…”

Structural and Optical Analysis of Ag Nanoparticles assisted Vertically Aligned TiO2 Nanowires based photoanode for Dye-sensitized Solar Cells Application

“…However, Ag is relatively low cost compared to Au and the SPR effect can be tune in the visible region by changing the shape and sizes [14]. Again, controlling the size of NPs decorated on the metal-oxide is still challenging since the controlled growth technique need state-of-the-art fabrication technique [19]. Moreover, most of the recently reported techniques are not catalytic-free and employed more than one synthesis technique to develop photoanode for DSSCs [15,20].…”