A creation of nanoscale semiconductors with the proper control of properties is of great significance in nanomaterials technology. The nature of semiconductors determines basically optical features, and the next factors are: size and crystalline structure of nanoparticles, matrix composition, interaction of the particles with environment, etc. The synthesis of silicate glasses with ternary semiconductor nanoparticles CuInSe₂ and CuInTe₂ has been developed by us recently, and in the present work, we consider studies of post-treatment of these glasses that reveals noticeable effect upon optical properties.
The bulk crystalline precursors CuInSe₂ and CuInTe₂ were produced by means of the single-temperature method with composition control by chemical analysis and XRD and doped to the glass system SiO₂-CaO-R₂O (R = Na, K, Li) under synthesis by the high-temperature melting in rducing conditions. The post-treatment was performed by heating under 500-600^oC during various time intervals. TEM evidenced spherical nanoparticles those were initially in the glass remain concentration with slight growth. Optical absorption (studied in the visible and near IR ranges) of the glasses varies significantly only at 600^oC treatment (that temperature is close to the beginning of matrix softening). Transmittance of the glasses becomes lower, and the excitonic maximum (appearing in the range 550-600 nm) grows in the case of CuInSe₂, while in CuInTe₂ nanoparticles it only red shifted (0.05 eV).
The studies showed that in our preparation procedure nucleation and growth of CuInSe₂ and CuInTe₂ nanocrystals in silicate glass occur at the step of primary melting. The method is useful for development of new optical materials for optoelectronic and non-linear optical applications.

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