Polycrystalline cadmium hydroxide nanomaterials have successfully been synthesized by composite-hydroxide-mediated approach with growth time variation. The influence of growth time on structural, morphological, elemental, and optical properties was explored using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray spectroscopy, and ultraviolet–visible spectroscopy. X-ray diffraction results revealed the hexagonal and monoclinic phases of cadmium hydroxide along with rhombohedral impurity phase of cadmium carbonate. Fourier transform infrared spectroscopy further endorsed the X-ray diffraction results and confirmed the Cd–O bonding vibrations. Time-dependent uniform distribution of spherical morphology was observed in the scanning electron micrographs of the product. The presence of cadmium and oxygen in the energy dispersive X-ray spectroscopy results fingerprinted the purity and formation of the desired nanomaterials. Crystallite size was decreased with the increase of growth time as estimated by the Debye–Scherrer method. Furthermore, the optical bandgap was measured by Tauc’s relation using ultraviolet–visible absorption spectra and found to be in the range of 3.2–3.5 eV.

中文翻译：

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通过复合氢氧化物介导的方法合成氢氧化镉纳米结构

多晶氢氧化镉纳米材料已通过复合氢氧化物介导的生长时间变化方法成功合成。使用 X 射线衍射、扫描电子显微镜、傅里叶变换红外光谱、能量色散 X 射线光谱和紫外-可见光谱研究了生长时间对结构、形态、元素和光学性质的影响。X 射线衍射结果揭示了氢氧化镉的六方和单斜相以及碳酸镉的菱形杂质相。傅里叶变换红外光谱进一步证实了 X 射线衍射结果并证实了 Cd-O 键合振动。在产品的扫描电子显微照片中观察到球形形态随时间的均匀分布。能量色散 X 射线光谱结果中镉和氧的存在确定了所需纳米材料的纯度和形成的指纹。根据德拜-谢勒方法估计，晶粒尺寸随着生长时间的增加而减小。此外，使用紫外-可见吸收光谱通过 Tauc 关系测量光学带隙，发现其范围为 3.2-3.5 eV。