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三阶光学非线性CdS–SiO2复合薄膜的电化学溶胶–凝胶制备及表征

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Abstract:

以硝酸镉、硫代乙酰胺(TAA)和正硅酸乙酯(TEOS)为前驱体,通过电化学溶胶–凝胶法在ITO玻璃基底上制备了CdS–SiO2透明薄膜。通过循环伏安实验确定电化学沉积条件,并研究了薄膜的性质。扫描电子显微镜和X射线能谱(EDX)分析表明,薄膜为纳米结构材料,薄膜由元素Si、O、Cd、S组成。X射线衍射(XRD)分析表明,薄膜中含有CdS,并且CdS晶体沿(103)、(202)晶面择优生长。综合EDX和XRD分析结果确认薄膜为CdS–SiO2复合薄膜。Z扫描表明薄膜具有非线性饱和吸收特性以及自散焦特性的非线性折射效应,为三阶光学非线性材料。薄膜三阶非线性极化率(?(3))较高,数量级达到了10–14(m/V)2。

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