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Wu J.,State Key Laboratory of Fine Chemicals | Xue D.,State Key Laboratory of Fine Chemicals
Materials Research Bulletin | Year: 2010

An alcohol thermal technique was applied to the controlled growth of hexagonal ZnO architectures via selective chemical etching. ZnO microdisks were produced first under mild alcohol thermal conditions in presence of formamide. Due to a higher surface energy/atomic density of Zn2+ {0 0 0 1} than that of the other faces, hexagonal ZnO microring was obtained by selectively etching positive polar surface of disk-like precursor with a high density of planar defects at the center. The selective etching of ZnO is related to its crystallographic characteristics of surface polarity and chemical activities, which opens a new opportunity for the shape-controlled synthesis of wurtzite-structured materials. © 2009 Elsevier Ltd. All rights reserved. Source


Li K.,State Key Laboratory of Fine Chemicals | Xue D.,State Key Laboratory of Fine Chemicals
Materials Research Bulletin | Year: 2010

On the basis of the viewpoint of structure-property relationship in solid state matters, we proposed some useful relations to quantitatively calculate the electronic polarizabilities of binary and ternary chalcopyrite semiconductors, by using electronegativity and principal quantum number. The calculated electronic polarizabilities are in good agreement with reported values in the literature. Both electronegativity and principal quantum number can effectively reflect the detailed chemical bonding behaviors of constituent atoms in these semiconductors, which determines the magnitude of their electronic polarizabilities. The present work provides a useful guide to compositionally design novel semiconductor materials, and further explore advanced electro-optic devices. © 2009 Elsevier Ltd. All rights reserved. Source


Liu F.,State Key Laboratory of Fine Chemicals | Xue D.,State Key Laboratory of Fine Chemicals
Materials Research Bulletin | Year: 2010

A chemical strategy has been purposely designed to hierarchically assemble nanoscale building blocks at the interface of solution/solid. Typically, a solution containing precursor of one component and a metal foil as metal source of another component were employed, on the basis of proposed chemical reactions on expected interfaces. Proper reaction parameters including temperature, pH value etc. were selected to adapt both chemical reactions in solution and on the metal surface. Consequently, at the interface of solution and metal foil, two kinds of nanoscale building blocks deposited simultaneously leading to the current hierarchical assembly. This strategy has been applied to the fabrication of a series of functional materials, including Nb2O5/TiO2, Nb2O5/LiF and ZnO/Co3O4. The current strategy provides a convenient one-step route to achieve complex functional structures, which may have potential applications in a variety of fields such as solar cells, Li-ion batteries, electrochemical supercapacitors, catalysts as well as chemical, gas, and bio-sensors. © 2009 Elsevier Ltd. All rights reserved. Source


Wu J.,State Key Laboratory of Fine Chemicals | Xue D.,State Key Laboratory of Fine Chemicals
Materials Research Bulletin | Year: 2010

Morphology-tuned ZnO microcrystals can be prepared by oxidizing zinc metal substrates in aqueous solution using hydrothermal technique. Some typical ZnO growth morphologies such as nanorod superstructures, nanorod arrays, microspheres, hierarchical nanostructures, and split crystals have been chemically fabricated. These microscopic shapes can be finely controlled by selecting Zn(NO3)2 concentration and solvent. A conceptual model was proposed to explain the formation of the as-prepared ZnO structures by selecting proper kinetic environments. This one-step, wet-chemical approach is controllable and reproducible, which can be conveniently transferred to industrial applications. © 2009 Elsevier Ltd. All rights reserved. Source


Wu J.,State Key Laboratory of Fine Chemicals | Xue D.,State Key Laboratory of Fine Chemicals
Science of Advanced Materials | Year: 2011

The intense interest in zinc oxide (ZnO) materials stems from their attractive semiconducting properties and wide potential applications. Technical control over the growth of ZnO and comprehensive study of its physical and chemical natures are of great significance in understanding the crystal growth mechanism and further developing new ZnO-based functional devices. This review presents a brief summary of recent research activities on the science and technology of ZnO as advanced material with an emphasis on the latest development in property study and chemical synthesis of ZnO structures. The solution-phase routes to grow bulk ZnO crystals, thin films, hollow structures, and nanoparticles will be detailedly demonstrated. Finally, we will briefly discuss some typical applications of ZnO devices for sensors, dye-sensitized solar cells, and field emission. © 2011 American Scientific Publishers. Source

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