Preparation and performance of natural graphite-silver nanoparticles/polyurethane conductive composites
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摘要: 采用热处理还原银盐原位引入银粒子的方法, 成功制备了天然石墨-纳米银/聚氨酯(C-Ag/PU)导电复合薄膜。并通过透射电镜(TEM)、 扫描电镜(SEM)观察了该复合薄膜的微观结构, 用X射线衍射仪(XRD)跟踪了银的还原和银粒子的生长过程, 探讨了加热温度和加热时间对银还原过程的影响, 研究了纳米银的生成和聚集对C/PU复合体系导电性能的影响。结果表明, 随着热处理的进行, 银粒子不断地生成和聚集, 最终以纳米尺寸(约10nm)均匀分散在聚合物基体中。纳米银粒子在天然石墨粒子之间起到了桥梁的作用, 改善了复合体系的导电通路, 显著提高了复合体系的导电性。Abstract: The natural graphite (C)-silver (Ag)/ polyurethane conductive composite films were prepared through in-situ incorporation of silver nanoparticles into the C/PU system by thermal treatment. The morphology of the composite films was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). X-ray diffraction (XRD) measurement was performed to trace the silver reduction and aggregation process. The results indicate that the silver ions are reduced to silver atoms and form silver nanoparticles with diameters of about 10nm dispersed in the PU matrix during the thermal treatment process. Furthermore, due to the bridging effect of silver nanoparticles among the natural graphite particles, the introduction of silver nanoparticles matrix has significantly enhanced the conductivity of C/PU composite films.
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Key words:
- polyurethane /
- natural graphite /
- silver /
- conductive composites
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