Abstract:

Using the layer-by-layer deposition method, the CdSe-CuTAPPI composite films were obtained on quartz substrate with CdSe nanoparticles and meso-tetra-(4-trimethylaminophenyl) porphyrin copper iodide(CuTAPPI) molecules as assembly units based on electrostatic interactions. The structure, morphology and thickness of the films could well be controlled in a nanoscale. The result of UV-Vis spectra indicated that the consecutive adsorption is uniform and regular, and the nearly equal amount of CuTAPPI and CdSe nanoparticles was assembled into mulilayers in each deposition cycle. The SEM images displayed that the distribution of the nanoparticles in the composite films was uniform, and there was little defects in the films. The influences of aging in the air and irradiation under UV-light on the photoluminescence properties of the CdSe-CuTAPPI composite film were investigated by using fluorescence spectroscopy in detail. It was showed that there existed a stronger interaction between CdSe nanoparticles and CuTAPPI molecules. So the photo-induced electron transfer can be produced from CuTAPPI to CdSe. Furthermore, the photostability of CuTAPPI in the composite film was higher.

Key words: Porphyrin, CdSe, Nanoparticles, Composite films, Luminescence