Controlled Synthesis Of Metal Sulfides Nanomaterials With Special Structures And Their Properties

Metal sulf ides nanomaterials possess new and special optical,electric properties and so on which make them have potential applications in many f ields,such as solar cells,Li-ion cells,biological probes,biomedical fields,optical materials and so on.They have aroused extensive attention due to their strong theoretical research values and potential applications.Many studies indicate that the structures of metal sulfides nanomaterials have a great influence on their properties.The controlled synthesis of nanomaterials with special structures and studying the relation between construction and properties are frontiers of international studies.In this paper,new controlled synthesis ways were proposed to synthesize a series of metal sulfides QDs and nano hierarchical assembled CuS with special structures by studying the synthesis ways and studied the relation betw een construction and properties;I find out anti-proliferation activities of amorphous and crystalline CuS QDs on cancer cells and normal cells are different which provides reference for their applications in cancer cares;the electrochemical performance and adsorption on dyes and heavy metal ion of the nano hierarchical assembled CuS samples with special structures were also investigated which make me realize they can act as the catalysis of OER and have good adsorption properties on dyes and heavy metal ions and the relation between construction and properties was also studied.The followings are the main research work:1.Amorphous and crystalline water-soluble CuS QDs were controllably synthesized through a two-step hydrolysis way which has not been reported and their biological properties were also investigated.QDs have small sizes which make them possess good and special properties and arouse extensive attention,but how to synthsize water-soluble QDs remains a challenge.In this paper,amorphous and crystalline water-soluble CuS QDs were controllably synthesized and their properties were characterized and studied.The results indicate amorphous and crystalline CuS QDs have small sizes and their average sizes are 2.7 nm and 3.3 nm respectively,not only possess good PL properties but also are stable in water and physiological solutions.The anti-proliferation activities of the amorphous and crystalline CuS QDs were evaluated through a MTT assay on Hela cells,HepG2 cells,S180 cells,and V79-4 cells.These results reveal that the anti-proliferation percentage on human cancer cells of QDs as high as 90% while the anti-proliferation percentage on normal cells of QDs is less than 50%,and CuS QDs exhibit higher anti-proliferation activities on human cancer cells than normal cells and the anti-proliferation activities of the amorphous CuS QDs on cancer cells are stronger than those of the crystalline QDs.The confocal laser scanning microscopy(CLSM)and flow cytometric quadrant analysis were used to study the essence of the anti-proliferation activities of the CuS QDs on cells which indicate QDs enter into the cells and cause the apoptosis and necrosis of cells.2.A series of QDs were obtained based on the hydrolysis way and their crystal types,sizes,compositions and properties were characterized.The two-step hydrolysis way was further used to synthesize CdS,ZnS and CuS/ZnS QDs indicating the way has extensive feasibilities.The results indicate they are less than 10 nm and stable in water,and possess good PL properties.The cell activity evaluation of these QDs indicates these QDs have different anti-proliferation activities on He la cells.3.Porous dandelion-like nano hierarchical assembled CuS samples were obtained through a facile water bath method and their electrochemical properties and adsorption of pollutants in aqueous solution were studied.Structures have a great influence on their properties,materials with assembled structures possess special properties and studying the relation between construction and properties is hot research in recent years.However,designing strategies to synthesize nano hierarchical assembld structures with good properties is still a challenge.In this paper,hierarchical porous dandelion-like CuS nano assembled structure was obtained and the assembled structure,properties were investigated.In addition,the growth mechanism was investigated and characterized.The results indicate the samples are about 1.5 ?m,composed by nanoparticals and possess good PL properties.The obtained samples were used as catalysis on OER and adsorbent for the removal of methylene blue(MB),rhodamine B(Rh B),methyl orange(MO)and Cd2+ from aqueous solutions.These results indicate the resulting samples exhibit excellent OER activity which is close to that of the best known commercial Pt/C(20 wt%)nanocatalyst and these materials can adsorb pollutant from wastewater well through electrostatic interactions.4.Nano hierarchical assembled waxberry-like CuS samples were obtained through a facile one-pot water bath method.Their morphologies and properties were characterized and their electrochemical properties were investigated which indicate they are about 1 ?m,composed by nanoparticals and have good optical adsorption between 200 nm and 1600 nm and possess good PL properties.The obtained samples were used as catalysis on OER.They have more stable catalytic ability than commercial Pt/C(20 wt%)nanocatalyst.