Synthesis And Characterization Of One-dimensional Inorganic Semiconductor/Conducting Polymer Core-Shell Nanocomposites

Inorganic semiconductor/conducting polymer nanocomposite material is a new type functional composite material which can be prepared by introducing the inorganic semiconducting particles into conducting polymer based on compound effect. This new type composite combines the advantages of conducting polymer and inorganic semiconductor, reflects the dual characteristics of both conductor and semiconductor. Moreover, it also shows some intrinsic properties based on complementary effect and synergistic effect after two components coupling with each other. Besides, nanocomposites could overcome the defects of each component. Therefore, such nanocomposite materials have attracted a great deal of attention.Compared with bulk materials, one-dimensional nanomaterials present more superior properties in electrical, optical, magnetic, chemical, thermal and mechanical field due to the surface effect, quantum size effect, small size effect and macroscopic quantum tunnel effect. Based on these advantages, one-dimensional nanomaterials are widely used as excellent candidate materials for electronic, optoelectronic, mechanical transmission devices. Meanwhile, it will play a great role as nanowires, nano-switches, nano-lines, high performance optical nano-fibers and new laser or light-emitting diode materials. The important application prospect of inorganic semiconductor/conducting polymer nanocomposites and one-dimensional nanomaterials shows a great influence on the development of new optoelectronic materials. In this thesis, we synthesized two kinds of one-dimensional inorganic semiconductor/conducting polymer core-shell composite nanorods. Following research is mainly included:1. Construction of one-dimensional ZnS/PPy nanocomposites. Firstly, ZnS nanorods were synthesized by solvothermal technique and its surface was modified by Polyvinyl Pyrrolidone (PVP) in ethanol. Using APS as the oxidant, ZnS/PPy nanorods were obtained by the direct polymerization of Py monomer on surface-modified ZnS nanorods. FTIR, Raman spectra and some other test results suggested that ZnS nanorods were wrapped into PPy successfully to form ZnS/PPy core-shell nanocomposites. The morphologies of final products were different by changing the proportions of ZnS nanorods, PVP and Py monomers. Compared these products, the most appropriate ratio was determined to synthesize ZnS/PPy nanorods with optimal morphology:0.01 g ZnS nanorods、0.01 g PVP、20μL Py. The UV-vis spectrum and cyclic voltammetric profile confirmed the electron transfer between ZnS nanorods and PPy.2. Fabrication of CdS/PEDOT and CdS/PANi nanorods. Using HCl as the dopant, APS as the oxidant, CdS/PEDOT and CdS/PANi nanorods were prepared by the in-situ polymerization of EDOT and ANi on CdS nanorods obtained by solvothermal method. Here, HCl played the role not only as the dopant, but also as the surface modifier. The core-shell structure of composite nanorods was confirmed by the characterization of SEM and TEM. FTIR, XPS and TGA curves showed that the charges were transferred between CdS nanorods and conducting polymer. Besides, compared to the emission spectra of uniform CdS nanorods, a blue shift and wide range in emission spectra were observed for the composite nanorods. The former one confirmed the charge-transfer in products, and latter one might be caused by low dispersity of solid powder and less uniformity of composite nanorods.