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Dextran-Controlled Crystallization of Silver Microcrystals with Novel Morphologies

The controlled synthesis of silver microcrystals with novel morphologies, such as solid or multiholed single crystalline disks, flowerlike aggregates consisting of platelike petals, and dendritic crystals consisting of wide leaves, was realized by using the polysaccharide dextran as a crystal growth modifier. The effects of dextran nature, dextran concentration, temperature, and solvent on the morphology of the silver crystals were investigated, and the obtained products were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. While the nonionic dextran showed little effect on the silver crystallization, the anionic dextran sulfate exhibited a significant influence on the morphology of the silver crystals. Silver microdisks with solid or multiholed structures were facilely obtained in water at a high dextran sulfate concentration (100 g L-1). With the aid of formamide, silver microdisks with thicknesses as thin as 50 nm can be easily obtained at a relati...