球形纳米银粒子的制备新方法

New Method of Preparation of Spherical Silver Nanoparticles

以三乙醇胺与硝酸银溶液形成的络合物水溶液为前驱体,聚乙烯吡咯烷酮(PVP)作分散剂,在40℃左右合成水溶性纳米银溶胶,并与银氨络合物为前驱体进行对比试验。紫外吸收光谱分析表明:在其它条件相同时,前者最大吸收峰远大于后者,表明前者纳米银的形成速率较快;透射电镜分析表明当银离子的浓度为100μg/mL、PVP浓度为400μg/mL,40℃反应半小时,形成的纳米银粒径分布均匀,平均粒径约5nm左右。

Nano-silver is widely used as a catalytic material, anti-static materials, low-temperature superconducting materials, bio-sensor materials, electronic pulp and antibacterial material. Silver nanoparticles preparation method reported in the literature range of their own characteristics, but there is inadequate. This study is the use of triethanolamine complexes formed with silver nitrate solution as the precursor to polyvinylpyrrolidone （PVP） as dispersant, at about 40℃ synthetic water-soluble nano-silver sol. And with the same concentration of silver ammonia complex as the precursor comparison test to compare the rate of formation of nano-silver, nano-silver sol stability and nano-silver particles size, morphology and particle size distribution. Ultraviolet absorption spectra show that： under the same conditions, the use of triethanolamine complexes formed with the silver nitrate solution, the rate is significantly higher than that for the precursor to the formation of nano-silver silver ammonia complexes as precursors, and silver nanoparticles obtained by the formersol particle size distribution is more uniform, better stability. And the formation of nano-silver particle size of about 5 rim.