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Structure of CdS/SiO2 Nanocomposites: Influence of the Precursor and Cd Concentration

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Abstract

The influence of using TMOS or TEOS in the formation of CdS quantum dots in a silica matrix have been studied by X-ray absorption spectroscopy (XAS). The amount of Cd-S bonds have been monitored as a function of the nominal Cd concentration. The relative amount of CdS crystals depends on the precursor. The use of TEOS is not recommended because it gives a poor yield, especially for high Cd concentration. A discussion of the influence of CdS concentration in matrices from TMOS is carried out from structural models created from their pore volume distribution. The mean pore size becomes smaller and the size distribution more uniform when CdS concentration increases but the nanocrystals of low CdS nominal content present a more efficient quantum confinement.

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Authors and Affiliations

  1. Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Cádiz, Apartado 40, Puerto Real, 11517, Cádiz, Spain

    Luis Esquivias, Rocío Litrán, Julián Rodríguez-Ortega, Eduardo Blanco, Milagrosa Ramírez-del-Solar & Nicolás de la Rosa-Fox

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  1. Luis Esquivias
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  2. Rocío Litrán
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  3. Julián Rodríguez-Ortega
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  4. Eduardo Blanco
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  5. Milagrosa Ramírez-del-Solar
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  6. Nicolás de la Rosa-Fox
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Esquivias, L., Litrán, R., Rodríguez-Ortega, J. et al. Structure of CdS/SiO2 Nanocomposites: Influence of the Precursor and Cd Concentration. Journal of Sol-Gel Science and Technology 11, 217–227 (1998). https://doi.org/10.1023/A:1008615710931

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