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Local defect structures play significant roles on material properties, but they are seriously neglected in the design, synthesis, and development of highly efficient TiO2‐based visible light catalysts (VLCs). Here, we take anatase TiO2 nanocrystals that contain (Ti3+, N3−) ions and have the complicated chemical formula of (Ti1-x4+Tix3+)(O2-y-z2-Ny3- □z) as an example, and point out that the formation of Ti3+‐VO‐2Ti4+‐N3− local defect clusters is a key missing step for significantly enhancing VLC properties of host TiO2 nanocrystals. Experimental and theoretical investigations also demonstrate the emergent behaviors of these intentionally introduced defect clusters for developing highly efficient VLCs. This research thus not only provides highly efficient visible light catalysts for various practical applications but also addresses the significance of local defect structures on modifying material properties. Defect‐clusters‐driven: Local defect structure could determine or create material properties since it could change a local chemical environment and subsequently mediate the electronic state density of materials. Here, we demonstrate that the deliberate design and formation of Ti3+‐VO‐2Ti4+‐N3− defect clusters in TiO2 anatase nanocrystals would drive the highly efficient visible light catalytic decomposition of organic contaminates. This research thus not only presents a defect‐engineering route to design/develop highly efficient visible light catalysts but also highlights the significance of local defect structures on modifying material properties. [ABSTRACT FROM AUTHOR]

Transition-metal ion-doped indium oxide was potentially used in spintronic devices. In this article, 10 at.% Co- and Fe-doped indium oxide nanocrystals were, respectively, prepared by direct solvothermal method. The influences of doped ions on their morphologies and magnetic properties of indium oxide nanocrystals were investigated. It was found that the doped ions could tune the microscopic morphologies and crystalline structures of indium oxide nanoparticles. Co-doped samples were polycrystalline nanoflowers aggregated by about 5 nm nanocrystals while Fe-doped specimens were single-crystalline nanocubes with crystalline sizes of about 16 nm. Meanwhile, the magnetic transition from diamagnetism to paramagnetism was also realized by doping Co or Fe ions into the indium oxide host matrices. In addition, their magnetic properties were further demonstrated to be intrinsic and not caused by impurities. [ABSTRACT FROM AUTHOR]

High magnetic field (HMF) treatment is an important strategy to tune the physicochemical properties of traditional materials. Here, we take nickel ion doped In 2 O 3 nanocrystals as an example and report that the magnetization behavior of diluted magnetic semiconductors can be easily tuned by HMF treatment. It is experimentally demonstrated that the room temperature ferromagnetism of lowly-doped nanocrystals can be greatly enhanced by HMF treatment while the paramagnetic properties of highly-doped samples is almost un-changed. These magnetic transition behaviors after HMF treatment are attributed to the rearrangement of magnetic ordering and the increment of grain-boundary defects. Our research not only points out an effective approach to induce the transition of spin states of diluted magnetic semiconductors but also provides a potentially efficient route to endow other traditional materials with novel physical properties. [ABSTRACT FROM AUTHOR]