Abstract
The effect of the reactivity and kinetics of photogenerated e––h+ pairs induced by postsynthesis treatments on shape-controlled TiO2 anatase nanosheets with dominant {001} facets is reported. Anata...
Highlights
Crystal facet engineering of TiO2 semiconductor nanoparticles (NPs) plays an important role in surface reactivity optimization.[1]
The work presents the effect of two different postsynthesis treatments on the electronic properties, and on the photoactivity, of shape-controlled TiO2 NPs that largely expose formally {001} facets
The NaOH washing method is limited to the surface, while the thermal treatment at 873 K impacts the bulk of the TiO2 NPs
Summary
Crystal facet engineering of TiO2 semiconductor nanoparticles (NPs) plays an important role in surface reactivity optimization.[1]. Electron paramagnetic resonance (EPR), ultraviolet-visible, near-infrared, and midinfrared (UV− vis−NIR−MIR) spectroscopy, and photoelectrochemical techniques are combined to evaluate bulk and surface electronic structures of TiO2 anatase nanosheets, revealing the nature of their active sites and the behavior of the photogenerated charge carriers. The aqueous suspensions were freeze-dried, obtaining a bluish powder because of the F− doping of anatase This material exposes nearly 20% of surface {101}. UV−vis−NIR spectra were recorded in the diffuse reflectance mode on thick selfsupported TiO2 pellets with a Cary 5000 Varian spectrophotometer equipped with an integrating sphere with an inner coating of Spectralon. This material was used as a reference. The key points of this photoreactor are strong versatility and maneuverability due to its small size, which allow a great measurement speed
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