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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Defect mediated photocatalytic activity in shape-controlled ZnO nanostructures
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Defect mediated photocatalytic activity in shape-controlled ZnO nanostructures

机译：形状控制的ZnO纳米结构中的缺陷介导的光催化活性

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摘要

Shape-controlled ZnO nanostructures were synthesized through a facile soft-chemical approach by varying the concentration of OH~- ions. X-ray diffraction and Raman spectra reveal the formation of highly crystalline single-phase hexagonal wurtzite nanostructure. It has been observed that the concentration of OH" ions plays an important role in controlling the shape of ZnO nanostructures. TEM micrographs indicate that well-spherical particles of size about 8 nm were formed at lower concentration of OH- ions whereas the higher concentration of OH- ions favor the formation of nanorods of length 30-40 nm. The optical studies confirmed that the band gap and near band edge emission of ZnO nanostructures are strongly dependent on the shape of particles. Furthermore, the decrease in the intensity of green emission as shape of particles changes from sphere to rod indicates the suppressing of defect density, which in turn influences the photocatalytic activity and ferromagnetic-like behavior of ZnO nanostructures.
机译：通过简便的软化学方法通过改变OH〜-离子的浓度合成了形状可控的ZnO纳米结构。 X射线衍射和拉曼光谱揭示了高度结晶的单相六方纤锌矿纳米结构的形成。已经观察到，“ OH”离子的浓度在控制ZnO纳米结构的形状中起着重要作用。TEM显微照片表明，在较低浓度的OH-离子中形成了约8 nm的球形颗粒。 OH-离子有利于形成长度为30-40 nm的纳米棒，光学研究证实ZnO纳米结构的带隙和近带边缘发射强烈依赖于颗粒的形状，此外，绿色发射强度的降低当颗粒的形状从球形变为棒状时，表明缺陷密度的抑制，这反过来又影响了ZnO纳米结构的光催化活性和类似铁磁的行为。

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