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摘要:本課題采用氧化還原反應(yīng)，在水相中，以硼氫化鈉為還原劑，把不同聚合物（PVP與PBMA-PDMAEMA）作為分散劑，通過還原硝酸銀溶液制備了納米銀分散液。同時，我們以甲基丙烯酸丁酯和甲基丙烯酸二甲胺乙酯為原料，通過ATRP法合成了PBMA- PDMAEMA嵌段共聚物。通過紫外-可見光譜的表征，發(fā)現(xiàn)制得的銀納米分散液在400-405nm處有較強的吸收峰，同時隨著PVP用量的增加，最大吸收峰逐漸紅移。熱重分析表明，用PVP做分散劑制得的納米銀比用共分散劑制得的納米銀失重小，故它的納米銀周圍包裹的分散劑較少。納米銀膜的導(dǎo)電性能表明，隨著燒結(jié)溫度的增大，納米銀膜表面的方塊電阻減小。 關(guān)鍵詞:納米銀,導(dǎo)電薄膜,化學(xué)還原法,紫外-可見光譜
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
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