室温制备纳米银醇溶胶

Room-Temperature Preparation for Ethanol Colloid of Silver Nanoparticles

摘要:

在室温下制备了分散性好、稳定性好、粒径分布均匀的高浓度纳米银醇溶胶。采用透射电子显微镜（TEM）、紫外可见光谱（UV-Vis）对产物的形貌和光学性能进行表征。结果表明，所制备的纳米银为分散均匀的球形粒子，平均粒径为4.8 nm。在此反应过程中，聚乙烯吡咯烷酮（PVP）既作保护剂又作还原剂，作为溶剂的乙醇有利于PVP分子链的舒展，增大了PVP分子与Ag+的接触几率，促进了还原反应的快速进行；另一方面，充分舒展的PVP分子能有效抑制银纳米粒子团聚

Abstract:

Stable concentrated ethanol dispersions of silver nanoparticles with a narrow size distribution were obtained at room temperature. The morphology and optical properties of the silver nanoparticles were characterized by transmission electron microscope (TEM) and visible spectrophotometer (UV-Vis). The results show that the silver particles possess spherical shape with an average diameter of about 4.8 nm with a good dispersion. During the preparation process, poly(vinyl pyrrolidone) (PVP) is used both as a reducing agent and a protecting agent and ethanol is used as a solvent that could rapidly reduce Ag+ in favor of a positively optimum extension of PVP molecule chain which increases the contact chance between PVP and Ag+. Moreover, the PVP molecule of full extension could effectively avoid aggregation of silver nanoparticles