Enhanced photocatalytic and electrochemical properties of Au nanoparticles supported TiO2 microspheres

Abstract

Au/TiO 2 composites were synthesized by a two-step hydrothermal approach and their photocatalytic and electrochemical properties were investigated. It is found that Au/TiO 2 composites with a large specific surface area, stability and catalytic activity of Au nanoparticles (NPs) demonstrate enhanced photocatalytic activity compared to pure TiO 2 microspheres. Furthermore, the electrochemical properties of the Au/TiO 2 composite electrode demonstrate its ability to electrocatalyze the oxidation of hydrogen peroxide and substantially increase the response current. In addition, this modified electrode also exhibits a very rapid and sensitive response towards glucose detection at the low operating potential. The modified electrode shows a linear response from 1.0 to 15 mM with a reproducible sensitivity of 1350 mA mM À1 cm À2 within a response time of less than 6 s. The photocatalytic and electrochemical activity of Au/TiO 2 composites provides a new platform for environmental remediation and biomedical applications. All these results reveal that Au/TiO 2 composites exhibit great prospects for developing efficient non-enzymatic biosensors.

Simple Fabrication of PVA–ZnS Composite Films with Superior Photocatalytic Performance: Enhanced Luminescence Property, Morphology, and Thermal Stability

“…1−4 Among the several methods, photocatalysis is considered to be one of the most promising technology because of its simplicity, low cost, and relatively high efficiency. 1,5 In this context, the design and fabrication of new materials similar to polymer composites for the removal of organic dyes is a matter of great practical importance. Polymers consisting of inorganic nanoparticles embedded in a transparent host matrix have the ability to fabricate unique properties such as optical, thermal, and high dielectric constant properties for precise applications such as sensors, photoelectric conversion, and photocatalysts.…”

Green synthesis of carbon-supported nanoparticle catalysts by physical vapor deposition on soluble powder substrates

“…In addition, a few studies have reported the synthesis of Pt NPs on high surface area Al 2 O 3 12 13 . However, for electrochemical systems, the NPs should be deposited on conductive materials, such as high surface area carbon materials, carbon nanotubes (CNT), and semiconducting materials (TiO 2 ) 14 15 16 .…”

Remediation of Diethyl Phthalate in Aqueous Effluents with TiO2-Supported Rh0 Nanoparticles as Multicatalytic Materials

“…The results were compared to the activities of the following three semiconductor materials: (i) the commercial anatase TiO 2 from Sigma-Aldrich (99% anatase, 325 mesh); (ii) the commercial rutile TiO 2 from Sigma-Aldrich; and (iii) a TiO 2 anatase form doped with Au(0) NPs, following the same procedure as for Rh(0) NPs. This Au(0) NPs@TiO 2 nanocomposite, with 0.1 wt.% metal loading, was evaluated as a reference, since gold NP-loaded TiO 2 materials have already proved their efficiency in the photocatalytic degradation of various pollutants [62,63], owing to their strong visible light absorption, due to localized surface plasmon resonance [64,65]. The aim of this study was to check the effect of rhodium nanospecies on the photoactivity of TiO 2 support, and to compare the obtained results to Au doping.…”