研究目的
Investigating the structural and optical properties of CdS/ZnTiO3 nanocomposites prepared using a chemical bath and different titanate concentrations.
研究成果
CdS–ZnTiO3 nanoparticulate composites were prepared by immersion of commercial ZnTiO3 nanoparticles in an aqueous solution used to prepare CdS. From XRD patterns, CdS was observed to grow as a wurtzite hexagonal structure and ZnTiO3 grew as a cubic crystalline phase. TEM images evidenced that the growing material formed clusters of mixed CdS and ZnTiO3 nanoparticles, which tended to form two-dimensional nanomembranes when the ZnTiO3 concentration was increased with respect to the CdS concentration. Optical absorption spectra revealed that cubic ZnTiO3 had an indirect band gap of 3.5 eV and a direct band gap of 4.0 eV. Photoluminescence spectra produced emissions in the range 1.6–3.2 eV that could be deconvoluted, all the cases, to three PL bands, whose relative intensity depended on the relative concentrations of CdS and ZnTiO3 in the composite.
研究不足
The study is limited to the structural and optical properties of CdS/ZnTiO3 nanocomposites prepared using a chemical bath and different titanate concentrations. The potential applications of these nanocomposites in optoelectronic devices are not explored in depth.
1：Experimental Design and Method Selection:
CdS nanoparticles were deposited on zinc titanate NPs using the CB technique. ZnTiO3 commercially obtained nanoparticles were introduced into the CB aqueous solution prepared with KOH,
2：5 M NH4NO, and 2 M CS (NH2)2, to obtain CdS semiconductor NPs. Sample Selection and Data Sources:
Three different molar concentrations of titanate were used.
3：List of Experimental Equipment and Materials:
A Siemens D-5000 diffractometer and a CuKα line (
4：15406 nm) were used for X-ray diffraction (XRD) measurements. The composition of the samples was determined using electron dispersion spectroscopy (EDS) with a Bruker XFlash 5010 detector installed on a Jeol JSM-6300 scanning electron microscope (SEM). PL spectra were registered using a conventional system equipped with a He–Cd laser for excitation. A Jeol JEM 2010 microscope was used for transmission electron microscopy (TEM) images and electron diffraction patterns. UV–visible light spectroscopy measurements were obtained on a Perkin Elmer Lambda 25 spectrophotometer. Experimental Procedures and Operational Workflow:
The bath solution temperature was 70°C and the solution was continuously stirred throughout the growing period (30 min) to ensure homogeneous distribution of the chemical components. When the growing temperature reached 70°C, the ZnTiO3 nanoparticles were added. The CdS/ZnTiO3 nanocomposite was synthesized after 30 min growth.
5：Data Analysis Methods:
Band gap energy was calculated by applying Tauc's method to the optical absorbance spectra data from the samples.
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