Graphitic carbon nitride (g-C₃N₄) nanosheets loaded with WO₃ nanoparticles were prepared via heat treatment of g-C₃N₄ together with WO_x-EDA nanobelts. The thermal treatment temperature and WO_x-EDA precursor play the key role in enhancing the interaction between WO₃ nanoparticles and g-C₃N₄ nanosheets, because the temperature of thermal decomposition of WO_x-EDA (∼400 °C) is close to the thermal exfoliation temperature of g-C₃N₄. The structure evolution and promotion effect of the nanocomposites in photocatalytic performance were well studied. It is found that WO₃ nanoparticles uniformly dispersed on the surface of the g-C₃N₄ nanosheets, and the close integration of WO₃ and g-C₃N₄ lead to the high photocatalytic activity in the degradation of RhB under visible light irradiation. Meanwhile, a larger specific area and increase of visible light absorption are also of benefit to speed up the degradation of organic dye. Also, the mechanism of the photocatalytic reaction and its reutilization properties were investigated.

The density of oxygen vacancy on WO ₃ with specific exposed facets can be regulated through different cooling methods.

Oxidation behaviors of three Ni-based model alloys and pure Ni in the temperature range of 700–1200 °C are investigated to reveal effects of Cr, Al, and Si on the oxidation resistance of Ni-based superalloys. The formation and integrity of consecutive chromia or alumina layers are important for excellent oxidation resistance. The addition of 20 at.% Cr can effectively improve the oxidation resistance of Ni-based alloys by forming a thin chromia film below 1000 °C, while adding 15 at.% Al has a beneficial effect on the oxidation resistance of Ni-based alloys at temperatures above 900 °C. The addition of 2 at.% Si to Ni-Al alloy is insufficient to form a protective SiO₂ layer but can accelerate the formation of alumina, which enables Ni-Al alloy to form a consecutive inner alumina layer at a relatively low temperature of 800 °C and further improve the oxidation resistance above 800 °C.

Single-crystalline bismuth-layered perovskite Bi₄Ti₃O₁₂ nanosheets with a thickness of about 20 nm and a lateral size over several micrometers have been synthesized by a PVA assisted hydrothermal route. The as-prepared Bi₄Ti₃O₁₂ nanosheets were characterized by means of X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy (TEM) and high-resolution TEM. The as-prepared Bi₄Ti₃O₁₂ nanosheets have (010) dominated surface facets. Time-dependent experiments reveal that the layered K₂Ti₆O₁₃ nanofibers formed in the initial stage of the hydrothermal treatment play a key role in the synthesis of Bi₄Ti₃O₁₂. In the proceeding hydrothermal treatment, the Bi³⁺ ions substitute for the K⁺ ions in the layered K₂Ti₆O₁₃ and peel off the TiO₆ octahedron lamellae from the lattice of K₂Ti₆O₁₃, which then serves as a template for the formation of lamellar Bi₄Ti₃O₁₂ by reaction with the dehydrated Bi³⁺ ions. Finally, the lamellar Bi₄Ti₃O₁₂ species crystallize and grow to single-crystalline Bi₄Ti₃O₁₂ nanosheets under the effect of the preferential adsorption of PVA on the (010) planes. In addition, the band gap and the optoelectronic properties of the single-crystalline Bi₄Ti₃O₁₂ nanosheets were investigated by measuring their UV-vis absorption and photoluminescence spectra, respectively.

Single-crystal strontium titanate (SrTiO₃) nanosheets have been synthesized via a solvothermal reaction route with ethylene glycol (EG) as reaction medium solvent. The as-synthesized SrTiO₃ products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and high resolution transmission electron microscopy, respectively. The results show that the single-crystal SrTiO₃ nanosheets are parallel to the (110) plane and self-assembled by primary nanocrystallites in monolayer. EG as a organic solvent plays an important role in the synthesis of the single-crystal SrTiO₃ nanosheets. Based on the experimental results, a possible formation mechanism of the single-crystal SrTiO₃ nanosheets has been proposed.