Controllable Synthesis And Function Research Of Innovative Bimetalli Nano-materials

Nano-materials have been widely applied in the field of fluorescent labeling, drug delivery,antibacterial and anticancer, catalysis, sensing and hemical storage, etc., due to their excellent biocompabiblity, low density, large specific surface area, and unique small size effect. In this thesis, the ion exchange technique was developed to synthesize a series of bimetallic sulfide nano-materials by using bovine serum albumin(BSA) as a template. The composites and content of the nano-materials were analyzed by XRD, FTIR, and TG-DSC. The morphology was observed by High-resolution transmission mlectron microscopy. The photocatalytic activity and biological activities were also assessed. This thesis contains the following two parts:(1) The combination of the biomimetic method and ion exchange technique has been developed to synthesize a series of bimetallic sulfide semiconductor nano-materials with uniform size and well dispersion, including BSA/ZnS-CdS, BSA/ZnS-Ag2 S and BSA/ZnS-PbS. In addition, the photocatalytic degradation activitis of nano-materials produts from the different ion-exchange time had been studied on the degradation of Rhodamine B(RhB) and methyl orange(MO). The results showed that the degradation activity of all nano-materials under the irradiation of 500 W mercury lamp was higher on MO than RhB.Moreover, the dye content had no significant effect on the degradation activity of nano-materials and the degradation rate got to over 80% in 15 min. Besides, the nano-materials had the stronger photocatalytic activity in the acid environment(e.g. p H 5.0 and 6.0) than in the base environment(e.g. pH 8.0 and 9.0).(2) The combination of the biomimetic method and ion exchange technique has been developed to prepare BSA/CdS-CuS quantum dots with 5 nm of size in diameter. PC 12 cells and Escherichia coli were used as the models to analyze the anticancer and antibacterial activies of quantum dots. The results revealed that the BSA/CdS-Cu S quantum dots showed significant inhibition on the growth of PC 12 cells and the inhibition rate could reach 74.88±0.4% when the content of quantum dots was 500 μg/mL. Besides, the BSA/CdS-Cu S quantum dots also showed the dose dependent inhibition activity on the growth of Escherichia coli.