Study of nanocomposite ZnSe/PMMA

The organic amorphous matrix of PMMA is transparent in the ultraviolet-visible area and so it allows the study of optical properties of ZnSe nanocrystals in this field. The thin films of PMMA/ZnSe nanocomposite were prepared using a colloidal solution and were deposited by spin coating technique on glass substrate. The investigation of samples by X-ray shows diffraction peaks of ZnSe semiconductor with cubic structure. The optical absorption spectra shows a large size distribution of the ZnSe crystallites and a shift of the band gap to the high energies compared to one of ZnSe bulk crystal. The photoluminescence spectra shows a wide emission band at 650 nm attributed to the radiative band to band transitions in the ZnSe nanocrystallites. These results confirm the dispersion of ZnSe nanocrystallites in the amorphous polymer PMMA and reveal some optical activity of the fabricated PMMA/ZnSe nanocomposite.