纳米银包裹双金属复合材料的制备及电性能研究

发布时间：2018-01-19 18:40

  本文关键词： 化学还原镀法 Cu@Ag Al@Ag 导电性能 抗氧化性能 柔性电热膜　出处：《华东师范大学》2017年硕士论文　论文类型：学位论文

【摘要】：银由于具有良好的电热性能可以被应用于许多领域,但其因价格昂贵,无法得到广泛使用。铜、铝等材料因具有与银相似的导电导热性能且价格便宜而应用广泛,但是铜、铝化学性质较活泼,暴露在空气中易被氧化而影响导电能力。因此,提出在铜、铝表面包裹一层银,制备成银包铜(Cu@Ag)和银包铝(Al@Ag)核壳颗粒,既降低了成本,又实现了良好的导电性。本论文采用化学还原镀法成功制备了 Cu@Ag和Al@Ag核壳颗粒,并利用扫描电子显微镜(SEM)、X射线衍射谱(XRD)、透射电子显微镜(TEM)、热重分析(TG)、四探针等测试手段对产物的形貌、结构及电性能进行了表征,获得了银包裹层可控、高导电、热稳定性良好且适合于导电浆料的双金属填充材料。通过乙二醇还原法制备的Cu@Ag样品包覆均匀,导电性能良好,压实电阻仅为1.6Ω/□,长期放置在空气中后表现出良好的抗氧化性能;一步还原法制备的铜银复合颗粒,阻值仅为0.74Ω/□,具有良好的抗氧化性能和热稳定性。快速还原法制备的Al@Ag核壳颗粒,克服了微纳级铝粉在空气中放置不导电的问题,实现了阻值为30Ω/□的导电性能。纳米银浆因良好的电热性能被广泛应用于柔性电阻加热膜中。实验中用Cu@Ag核壳颗粒掺杂银浆制备的加热膜,在低压5V驱动的条件下实现了较好的膜加热功能。实验结果表明,纵向排布的电极加热均匀性更佳。所制电热膜在低温0℃环境下,实现了平均30℃以上的载体温升,为纳米双金属复合颗粒在柔性印刷电子领域的应用奠定了基础。
[Abstract]:Silver can be used in many fields because of its good electrothermal properties, but it can not be widely used because of its high price. Aluminum and other materials have been widely used because of their similar conductivity and thermal conductivity as silver, but copper and aluminum are more active in chemistry and easily oxidized in air. Therefore, copper is proposed in copper. The core-shell particles were prepared by coating a layer of silver on the surface of aluminum and preparing the core-shell particles of silver coated copper (Cu@ Ag) and silver-clad aluminum (Albd), which reduced the cost. In this thesis, Cu@Ag and Al@Ag core-shell particles were successfully prepared by electroless reduction plating and SEM). The morphology, structure and electrical properties of the products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and four-probe. Bimetallic filler materials with controllable silver coating, high conductivity, good thermal stability and suitable for conductive paste were obtained. The Cu@Ag samples prepared by ethylene glycol reduction method were coated uniformly and had good conductivity. The compaction resistance is only 1.6 惟 / -, which shows good oxidation resistance after being placed in air for a long time. The copper-silver composite particles prepared by one-step reduction method, with a resistance of 0.74 惟 / -, have good oxidation resistance and thermal stability. The Al@Ag core-shell particles prepared by rapid reduction method have good oxidation resistance and thermal stability. It overcomes the problem that micro-nano grade aluminum powder is placed in air without conducting electricity. The nano-silver paste was widely used in the flexible resistance heating film because of its good electrothermal properties. In the experiment, the Cu@Ag core-shell particle doped silver paste was used to prepare the heating film. The film heating function is realized under the condition of low voltage 5V drive. The experimental results show that the electrode with longitudinal arrangement has better heating uniformity, and the electrothermal film is prepared at 0 鈩，

本文编号：1445079