摘要:本课题采用氧化还原反应，在水相中，以硼氢化钠为还原剂，把不同聚合物（PVP与PBMA-PDMAEMA）作为分散剂，通过还原硝酸银溶液制备了纳米银分散液。同时，我们以甲基丙烯酸丁酯和甲基丙烯酸二甲胺乙酯为原料，通过ATRP法合成了PBMA- PDMAEMA嵌段共聚物。通过紫外-可见光谱的表征，发现制得的银纳米分散液在400-405nm处有较强的吸收峰，同时随着PVP用量的增加，最大吸收峰逐渐红移。热重分析表明，用PVP做分散剂制得的纳米银比用共分散剂制得的纳米银失重小，故它的纳米银周围包裹的分散剂较少。纳米银膜的导电性能表明，随着烧结温度的增大，纳米银膜表面的方块电阻减小。

关键词:纳米银,导电薄膜,化学还原法,紫外-可见光谱

Abstract:In water phase, silver nano-colloid was prepared by chemical reduction method with sodium borohydride as reductant, different polymers (such as PVP and PBMA-PDMAEMA) as dispersant, and silver nitrate as main salt. The PBMA-PDMAEMA  block copolymers were synthesized by ATRP method with n-Batyl methacrylate and dimethylaminoethyl as monomer. UV-Vis spectrum revealed that the Ag nano-collide has a strong absorption peak at 400-405nm. With the increase of the amont of PVP, the maximum peaks were redshifted. Thermogravinmetry analysis (TGA) showed that product with PVP as dispersant contains more Ag w% than that with PBMA-PDMAEMA as dispersant. So, there are less dispersant around silver nano-colloid which was synthesized with PBMA-PDMAEMA as dispersant. The conductivity of the silver nano-colloid showed that with the increase of the temperature, the sheet resistance of the silver nano-colloid is more lower.

Key words: Silver nanoparticles; chemical reduction method; UV-Vis spectrum