基于银纳米线柔性可延展电路的印刷制备

Preparation of flexible and stretchable circuit via printing method based on silver nanowires

柔性可延展电子器件因其能够适应非平面的工作环境,将突破现在电子器件的应用范围,促进信息与人的融合,在智能穿戴电子、柔性显示、生物医疗等领域具有广阔的应用前景.本文通过印刷的方法实现银纳米线(Ag NWs)/聚二甲基硅氧烷(PDMS)柔性可延展电路的制备,研究了不同尺寸Ag NWs印刷构成的导电网络对柔性电路拉伸表面微结构的影响,并且进一步探讨了表面微结构与柔性导线拉伸电学性质的关系,尤其详细讨论了表面褶皱状结构的出现对柔性导线拉伸电阻的影响,并给出了具体的解释和讨论.最后展示了LED集成的柔性发光电路,并且实现了一定的可延展特性.本研究对于柔性可延展电路的制备提供了一条新的思路,具有重要意义.

Flexible and stretchable electronics attract much more attention in recent years due to their excellent conformability to non-planar environment and potential applications in wearable electronics, flexible display and bioengineering. In this work, we report the use of printing strategy applied to the fabrication of flexible and stretchable circuit. The prepared Ag NWs paste was printed on glass substrate to form conductive circuit via screen printing, and liquid PDMS was casted on top of the printed Ag NWs circuit and cured to peel off the substrate. The randomly oriented Ag NWs were buried in PDMS to form conductive and stretchable circuit. We studied the influence of the diameter of Ag NWs on the surface morphology of Ag NWs/PDMS circuit during strain process and further analyzed the relationship between the surface micro-structure and electrical property of Ag NWs/PDMS conductor. The results showed that the cracks happened on the surface of circuit with Ag NWs of smaller diameter in stretching process, while the buckling structure appeared after pre-tension strain of 100% with Ag NWs of larger diameter. The buckling of Ag NWs/PDMS layer resulted in the stable resistance of stretchable circuit in the strain range of 0–50%. We also demonstrated the printed stretchable circuit integrated with LED array under bending, twisting and even stretching deformation. The printing method may provide a new step towards the development of stretchable strategies for conductive circuit and other wearable electronics.