AgPO/NiO Composites with Enhanced Photocatalytic Activity under Visible Light.

Black NiO powders were prepared by a hydrothermal method. Moreover, the visible light-driven AgPO/NiO photocatalyst composites were successfully synthesized by in situ precipitation method. These samples were structurally characterized by X-ray diffraction and Rietveld refinement.

Structural and Optical Properties of CaCuWO Solid Solution Synthesized by Sonochemistry Method at Room Temperature.

In this work, we report the room-temperature synthesis of pure calcium tungstate (CaWO) and copper-doped calcium tungstate solid solution (CaCuWO) by using a sonochemistry method. These materials were structurally characterized by X-ray diffraction (XRD) and Raman spectroscopy. The obtained XRD patterns were submitted to a Rietveld refinement showing, in both materials, a tetragonal phase with space group and point group of 4 and , respectively.

Decreasing Nanocrystal Structural Disorder by Ligand Exchange: An Experimental and Theoretical Analysis.

Nanocrystals (NCs) present unique physicochemical properties arising from their size and the presence of ligands. Comprehending and controlling the ligand-crystal interactions as well as the ligand exchange process is one of the central themes in NC science nowadays. However, the relationship between NC structural disorder and the ligand exchange effect in the NC atomic structure is not yet sufficiently understood.

Effects of chemical substitution on the structural and optical properties of α-Ag2-2xNixWO4 (0 ≤ x ≤ 0.08) solid solutions.

In this work, we investigated the effects of chemical substitution on the structural, electronic, and optical properties of α-Ag2-2xNixWO4 (0 ≤ x ≤ 0.08) solid solutions prepared by a facile microwave-assisted hydrothermal method. The results showed that the increase of Ni concentration in α-Ag2WO4 microcrystals as a host matrix caused a morphological transformation and a shift of the electronic and optical properties.

Understanding the fundamental electrical and photoelectrochemical behavior of a hematite photoanode.

Hematite is considered to be the most promising material used as a photoanode for water splitting and here we utilized a sintered hematite photoanode to address the fundamental electrical, electrochemical and photoelectrochemical behavior of this semiconductor oxide. The results presented here allowed us to conclude that the addition of Sn(4+) decreases the grain boundary resistance of the hematite polycrystalline electrode. Heat treatment in a nitrogen (N2) atmosphere also contributes to a decrease of the grain boundary resistance, supporting the evidence that the presence of oxygen is fundamental for the formation of a voltage barrier at the hematite grain boundary.

Structural and photoluminescence properties of Eu(3+) doped α-Ag2WO4 synthesized by the green coprecipitation methodology.

Europium doped silver tungstates α-Ag2-3xEuxWO4 (x = 0, 0.0025, 0.005, 0.