Synthesis, Characterize And Photoelectronic Properties Of Q-CdS/polymer Nanocomposite Films

In this thesis, the studies on the synthesis, analysis means, the properties and applications of CdS/polymer nanocomposite films have been reviewed in detail. A series of Q-CdS/polymer nanocomposite films with different polymer materials, different sizes or different content of Q-CdS were prepared and their morphological structure and sizes were observed in TEM images. Photoelectronic properties of these nanocomposites were studied by UV-vis spectra, fluorescent spectra and conductivity measurement, etc.1. Several kinds of Q-CdS nanoparticles with different sizes were prepared by changing the content of H2S, the radio of the reactants and the times of size-selective precipitation. In addition, Q-CdS nanoparticles with narrow disperse were obtained by changing the type and volume of precipitating agent and times of precipitation, etc. The effect of surface modification of Q-CdS was studied by changing carbon chain and content of mercaptan and environment of synthesis. The results showed that the intensities of the samples would increase more greatly than that of the un-modified in fluorescence spectra and two kind of fluorescence with different color would be observed.2. Some kinds of Q-CdS/polymer nanocomposite films were successfully prepared by mixing Q-CdS with polymer under different conditions such as particle sizes, the ratio of the Q-CdS/polymer and the kind of polymer matrix, etc. Their morphological structures were observed in TEM image. The results indicate that the strong interaction between Q-CdS particles and polymers had the obvious effect on preventing the particles from aggregating. At the same time, the size quantization effect was observed on their UV-vis spectra.3. Size quantization effect was also observed on fluorescent spectra of different sizes Q-CdS/polymer nanocomposite films. Compared to Q-CdS nanoparticles or single matrix, these nanocomposite films have the capability to show special fluorescent properties due to the strong interaction between them and the intensitywould change with the content of the Q-CdS nanoparticle.4. A series of Q-CdS/PANi nanaocomposite solution were successfully prepared by mixing Q-CdS with PANi and characterized by UV-spectra, fluorescent spectra and conductivity measurement etc. The special fluorescent and conductive properties can be observed due to the nanostructure of Q-CdS and the ability of intermingle forPANi.