Structure And Properties Of Ag Regulation Based Nanomaterials

Ag nanomaterials, due to their unique physical, chemical, electrical and opticalproperties, have attracted considerable attention in recent years for applications incatalysis, biomedical, chemical sensing and environmental treatment etc. There aremany methods for preparing Ag nanomaterials，but the complex preparation proceduresand special equipment requirement might seriously limit the large-scale application ofAg nanomaterials. Therefore, developing simple and environment-friendly methods forthe preparation of Ag nanomaterials is still of great significances. On the basis of theabove consideration, we have developed series of the effective strategies for thefabrication of the Ag-based nanomaterials and studied their properties. The researchcontents are as follows:1. Compared with traditional fluorophores, such as organic dye and quantum dots,the fluorescent Ag nanoclusters (NCs) have a relatively good photostability and lowtoxicity, which make the strong interest in the synthesis of the fluorescent Ag NCs. Byusing the silver nitrate as silver source, sodium oleate as a reductant and protectiveagent, we have successfully prepared fluorescent Ag nanoparticles. Experimental resultsshowed that the reaction time had an important influence on the size and properties ofthe Ag NCs. In addition, we studied its application in respect of the detection of toxicions.2. An easy and rapid intermittent microwave heating (IMH) method was developedfor the synthesis of the Ag nanostructure with high yields within2minutes and the Agnanostructure were combined with ZnO to form Ag-ZnO composites. During thepreparation process, the silver nitrate was used as silver source, and the n-dodecylmercaptan as a protective agent to prepare Ag precursor firstly. The Ag nanoparticleswere prepared using IMH method. The formation process of the silver nanoparticleswas studied in detail, and the results showed that the heating time had an important influence on the size of silverparticles. The Ag could be easily combined with ZnO toform Ag-ZnO composites with large potential for photocatalytic applications.3. The Ag3PO4nanomaterials were successfully prepared through a simpleprecipitation reaction. The morphology of Ag3PO4nanomaterials could be regulated bychanging the solvent. The results have shown that, under the light, the part of the Ag+inAg3PO4can be reduced to Ag, to form the Ag-Ag3PO4composites. Due to the synergyof Ag+, Ag NPs and the semiconductor properties of Ag3PO4, the materials exhibited theexcellent bactericidal antibacterial properties.