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Characterization of Cds clusters in zeolite-A grown in alkaline solution |
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| Authors: | R Ochoa-Land?&#x;n M Flores-Acosta R Ram?&#x;rez-Bon H Arizpe-Chávez FF Castillón-Barraza |
| Institution: | a Centro de Investigación y Estudios Avanzados del IPN, Unidad Querétaro, Apdo Postal 1-798, 76001 Querétaro, Qro., Mexico b Departamento de F?́sica, Universidad de Sonora, Apdo Postal 142, Hermosillo, Son., 83190 Mexico c Centro de Investigación en F?́sica, Universidad de Sonora, Apdo Postal 5-88, Hermosillo, Son., 83190 Mexico d Centro de Investigación en Pol?́meros y Materiales, Universidad de Sonora, Apdo Postal 130, 83190 Hermosillo, Son., Mexico e Centro de Ciencias de la Materia Condensada, Universidad Nacional Autónoma de México, Apdo Postal 2681, 22800 Ensenada, BC, Mexico |
| Abstract: | CdS clusters were synthesized in A type zeolite by reaction in alkaline aqueous solution at temperatures from 30 to 70 °C. The optical properties of the samples were studied by diffuse reflectance and photoluminescence spectroscopy. Their crystalline structure and morphology were studied by X-ray diffraction and by transmission and scanning electron microscopy. We found that at lower temperatures the CdS clusters are encapsulated in the zeolite cages. We compared the properties of these clusters with those encapsulated in the cages of zeolites X and Y, prepared by similar methods. CdS clusters smaller than the CdS exciton diameter are also formed outside the cages in the zeolite matrix. The size of these clusters increases with temperature producing a red-shift of the absorption edge in the optical absorption spectra. |
| Keywords: | A Nanostructures |
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