| Nanotechnology is one of the leading science and technologies in the21st century. The goal of nanotechnology is to manufacture products with specific functions by using its unique physical, chemical and biological properties. The development of convenient and effective ways to prepare the nanomaterials with a specific morphology and size is very important for the study of functional nanomaterials and new devices. However, the preparation of organic molecule has poor controllability due to its low melting point and poor thermal stability. On the other hand, the method for the preparation of inorganic nanomaterials is generally not applicable for the synthesis of organic nanomaterials. Therefore, it has attracted much attention of researchers to explore the controllable preparation of organic nanomaterials in morphology and performance.In this dissertation, the organometallic complexes material BeBq2was fully investigated, and the morphology control, growth mechanism and optical properties in these materials were investigated systematically.(1) The issue studied the controllable preparation of BeBq2nanomaterials by means of reprecipitation method. We prepared BeBq2rectangular nanosheets, parallelogram nanosheets and nanowires by using different types of good and poor solvents. The CTAB acts as a template in the growth process of the nanowires. The SEM photographs characterized the morphology and size of the samples. The luminescent properties of nanomaterials were characterized by the fluorescence microscopy, wherein BeBq2rectangular nanosheets had a significant phenomenon of optical waveguide. The growth mechanism of nanomaterials could be determined by the single-crystal data and molecular arrangement. By analyzing the single crystal data of BeBq2, we learned the molecular arrangement and studied the growth mechanism of nanomaterials.(2) In this paper, we made intensive study of rectangular nanosheets with significant waveguide phenomenon based on the above three nanostructures. Rectangular BeBq2nanosheets were prepared by using the repercipication method with good solvent DMF and poor solvent hexane. The nanosheets have good shape and uniform size,10μm in length,5μm in width and a few hundred nanometers in thickness. The growth mechanism and crystalline of nanosheets were studied by XRD and the single-crystal data. Then the optical properties of BeBq2nanomaterials, especially optical waveguide properties, were researched systematically. The steady-state emission spectra showed the peak at526nm of BeBq2nanosheets redshifted26nm and15nm with respect to molecules and bulk material. We had further discovery that the rectangular BeBq2nanosheets have good waveguide characteristics, and we also studied the fluorescent propagation decay rate along one dimension of BeBq2nanosheets. |
