Effect of pH on the crystallite size, elastic properties and morphology of nanostructured ZnS thin films prepared by chemical bath deposition technique
Effect of pH on the crystallite size, elastic properties and morphology of nanostructured ZnS thin films prepared by chemical bath deposition technique
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DOI：
10.1016/j.matchemphys.2019.122277
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发表时间：
2020-02-01
影响因子：
4.6
通讯作者：
Saikia, P. K.
中科院分区：
文献类型：
--
作者：
Arandhara, Gitashri;Bora, Jyotimoni;Saikia, P. K.
以不同ph值的乙酸锌、硫脲为锌、硫和氨的前驱体，采用化学浴沉积技术在玻璃衬底上制备了硫化锌薄膜。x射线衍射图表明，薄膜具有纳米晶性质，衍射峰展宽。有效质量近似法、Scherrer法和Williamson-Hall图被用来测定晶体尺寸。计算的晶体尺寸与高分辨率透射电子显微镜图像估计的晶体尺寸有很好的相关性。HRTEM图像显示，纳米晶体晶格条纹清晰，取向随机，相互重叠。采用Williamson-Hall分析的修正形式，即均匀变形模型、均匀应力变形模型和均匀变形能量密度模型，计算了ZnS薄膜的晶格应变、应力和能量密度等弹性性能。扫描电镜图像显示，合成的ZnS薄膜在pH为9.6时呈颗粒状结构，随着pH的增加，颗粒聚集成较大的颗粒。结果表明，氨浓度对薄膜的光学性能、晶粒尺寸、弹性性能和表面形貌有明显的影响。
Zinc Sulphide thin films have been fabricated on glass substrate via chemical bath deposition technique using zinc acetate, thiourea as the precursor of zinc and sulfur and ammonia for varying pH. The X-Ray diffraction patterns indicate the nanocrytalline nature of the films with broadening of diffraction peaks. Effective Mass Approximation, Scherrer Method and Williamson-Hall plots have been employed for determining crystallite size. The calculated crystallite sizes correlate well with the estimated crystallite sizes from High Resolution Transmission Electron Microscopy images. The HRTEM images show clear lattice fringes of nanocrystallites overlapping each other with random orientations. The elastic properties such as lattice strain, stress and energy density of ZnS thin films have been calculated from the modified form of Williamson-Hall analysis namely Uniform Deformation Model, Uniform Stress Deformation Model, and Uniform Deformation Energy Density Model. The Scanning Electron Microscope images indicate the granular texture of synthesized ZnS thin film at pH 9.6 and coagulation of granules into larger one with increase of pH. The results reveal the obvious effect of ammonia concentration on the optical properties, crystallite size, elastic properties and morphology of the surface of the films.