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Abstract
Surface-modified nanocrystalline CdS has been integrated in amorphous BaTiO 3 films by a dip-coating process. The films were characterized by X-ray photoelectron spectra and transmission electron microscopy technique. The thin films exhibited unique absorption edge blue-shift with the increase of heat-treatment temperature due to the dielectric confinement in BaTiO 3 matrix and the thermal expansion mismatch between the semiconductor quantum dots and the host matrix. The strong fluorescence of CdS quantum dots at room temperature has been observed and is mainly attributed to the band-edge transition of CdS quantum dots. The composite films also exhibit ultra-fast non-linear response and high non-resonant, third-order optical non-linearities.
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