Optical properties of ZnO nanocrystals embedded in PMMA
Optical properties of ZnO nanocrystals embedded in PMMA
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DOI：
10.1007/s11082-013-9693-1
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发表时间：
2014
影响因子：
3
通讯作者：
A. Chaieb;A. Chari;B. Sahraoui
中科院分区：
文献类型：
--
作者：
A. Chaieb;A. Chari;B. Sahraoui
在这项工作中，我们报告的ZnO纳米晶体的合成和分散在聚甲基丙烯酸甲酯使用一个简单的路线，并通过旋涂技术沉积在类衬底的薄膜的制备。通过X射线衍射、吸收光谱和光致发光光谱研究了它们的结构和光学性质。XRD图谱显示出对应于六方（纤锌矿）相衍射面的尖锐峰。光学特性表明，在所研究的范围内有一个宽的吸收带，在481.5，531.09和671.28 nm处有一个大的发射带，用有效质量近似模型估算了微晶半径（R）约为1.8 nm。利用谐波发生技术在皮秒范围内测量了二阶介电常数，推导出了tom/V，与ZnO体材料（2.5pm/V）相比，tom/V大了四个数量级。
We report in this work the preparation of thin films of ZnO nanocrystals synthesized and dispersed in polymethylmethacrylate using a easy route and deposited in class substrate by spin coating technique. Their structural and optical properties were investigated by X-ray, absorption and photoluminescence spectroscopy. The XRD patterns exhibit sharp peaks atcorresponding to the hexagonal (wurtzite) phase diffraction planes. The optically characterization, exhibit a wide absorption band in the range of the study and a large emission band with three peaks at 481.5, 531.09 and at 671.28 nm.The crystallites radius (R) was estimated by applying the effective mass approximation model and was about 1.8 nm. From measurements of second order susceptibilities using harmonic generation technique atin picoseconds regime we deducedequal tom/V. Obtainedwas four order of magnitude larger compared with ZnO bulk material (2.5 pm/V).