Tuning of optical properties of CdS nanoparticles synthesized in a glass matrix
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Attempts were made to provide the data concerning directed synthesis of semiconductor nanoparticles in a dielectric silica-based glass matrix. These attempts involve finding out the connections between the structure, size of CdS nanoparticles, and optical properties of the nanocomposites produced. High-resolution focused ion beam scanning electron microscopy images of CdS nanoparticles incorporated in glass and SAXS results confirm the formation of uniformly distributed spherical CdS nanoparticles with an average diameter of about 6.2 nm. UV–Vis measurements show that CdS composites possess a direct bandgap wider than 2.45 eV depending on the heat treatment conditions; thus, heat treatment can be used to control nanoparticle size in each selected composite. The emission spectra showed a maximum at about 603 nm and a red shift of about 100 nm with increasing annealing temperature that is associated with the presence of defect states in the nanoparticles. In addition, semiconductor phase concentration in the glass matrix was found by using optical absorption data for the first time, which allows understanding the effect of nanocomposite structure on luminescence properties.
KeywordsCdS Nanoparticles Glass Quantum dots Nanocomposite Optics
The authors are grateful to Maria Lukashova for SEM and EDX experiments that were performed at TESCAN Demonstrating Center in Saint Petersburg, Russia. The DTA/DSC experiment was carried out at the Center for Thermogravimetric and Calorimetric Research of Research Park of Saint Petersburg State University in Saint Petersburg, Russia. The SAXS measurement was performed in the University Erlangen-Nuremberg, Germany. The authors are grateful to Balyakin I.A. from the Institute of Solid State Chemistry in Ekaterinburg, Russia, for carrying out and imaging the simulations of nanocomposites.
This study was funded by the Russian Foundation for Basic Research (project no. 17-03-01024).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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