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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 >The structure and optical properties of ZnO nanocrystals dependence on Co-doping levels
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The structure and optical properties of ZnO nanocrystals dependence on Co-doping levels

机译：ZnO纳米晶体的结构和光学性质取决于Co掺杂水平

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摘要

Pure and Co-doped ZnO (Co:ZnO) nanocrystals with different doping levels were synthesized via a coprecipitation process. The structure and morphology of the as-prepared samples were characterized by XRD, EDS, XPS and FESEM. Results show that cobalt ions, in the oxidation state of Co~(2+), replace Zn~(2+) ions into the ZnO lattice without changing its wurtzite structure. The dopant content varies from 0.35 to 2.94% depending on Co-doping levels. The particles have a nearly spherical morphology with dimensions of 80–150nm for pure ZnO and 50–120nm for Co:ZnO. The optical properties of the samples were studied by UV–vis absorption and PL spectra. The band gap of Co:ZnO nanocrystals decreases with the increasing dopant content, resulting in red shifts of the wavelength in UV absorption and PL emissions.
机译：通过共沉淀过程合成了具有不同掺杂水平的纯的和共掺杂的ZnO（Co：ZnO）纳米晶体。通过XRD，EDS，XPS和FESEM对所制备样品的结构和形貌进行了表征。结果表明，钴离子在Co〜（2+）的氧化态下，将Zn〜（2+）离子替换为ZnO晶格而未改变纤锌矿结构。取决于共掺杂水平，掺杂剂含量从0.35％到2.94％变化。颗粒具有接近球形的形态，纯ZnO的尺寸为80–150nm，Co：ZnO的尺寸为50–120nm。通过紫外可见吸收和PL光谱研究了样品的光学性质。 Co：ZnO纳米晶体的带隙随掺杂剂含量的增加而减小，从而导致紫外线吸收和PL发射波长的红移。

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