Abstract
Eu3+-doped PMMA-SiO2 hybrid materials were prepared by the sol–gel route using 3-trimethoxy-silyl-propyl-methacrylate (TMSPM) as the coupling agent between the organic and inorganic phases. Several Eu3+-doped hybrid samples were prepared at different coupling agent concentrations and analyzed through their luminescence spectra using the Eu3+ ion as a spectroscopic probe. The excitation spectra of the hybrid solutions display a broad band attributed to the charge transfer transition between the europium ions and the hybrid matrix, with intensity increasing as the TMSPM concentration decreases. The TMSPM concentration effect on the emission spectra of the Eu3+-doped PMMA-SiO2 hybrid materials was analyzed by the R asymmetry parameter calculation. The results showed that the R value also increases as the TMSPM concentration decreases, yielding a linear relationship between the charge transfer band intensity and the R parameter. This was interpreted as a symmetry reduction in the local environment around the Eu3+ ions, which have stronger interaction with the polymethylmethacrylate (PMMA) phase.
Highlights
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Eu3+ ions incorporation in PMMA-SiO2 hybrids to evaluate the local structure varying TMSPM concentration.
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Eu3+ photoluminescent properties gave information about local environment structure, sensing local morphological changes.
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Lower concentration of TMSPM produce greater local distortion around the ions.
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Data availability
For manuscripts that are a report of a study, MLM-R confirms that this work is an accurate representation of the experimental results. The data that support the findings of this study are available from the corresponding authors upon reasonable request.
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Acknowledgements
This work was financially supported by CONACYT. The authors acknowledge C. A. Ávila Herrera, M. T. Rivelino Flores Farías, R. A. Mauricio Sánchez, Ing. J. E. Urbina and Adair Jimenez Nieto for their helpful technical assistance.
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All authors contributed to the study conception and design. Material preparation, data collection, and investigation were performed by MLM-R and RR-B. The first draft of the manuscript was written by MLM-R and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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MLM-R certifies that all financial and material support for the conduct of this study and/or preparation of this manuscript has been supported by CONACYT resources.
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Melgoza-Ramírez, M.L., Ramírez-Bon, R. Europium ions as a spectroscopic probe in the study of PMMA-SiO2 hybrid microstructure with variable coupling agent. J Sol-Gel Sci Technol 107, 46–56 (2023). https://doi.org/10.1007/s10971-021-05582-2
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DOI: https://doi.org/10.1007/s10971-021-05582-2