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.
国家重点基础研究发展计划资助项目(2015CB351900)
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图1
(网络版彩图)Ag NWs/PDMS柔性可延展电路的制备流程示意图
图2
30 nm直径(a)和90 nm直径(b)的Ag NWs扫描电子显微镜(SEM)照片; (c) 配制得到的Ag NWs浆料, 尺寸为 90 nm
图3
(网络版彩图)(a)印刷制备Ag NWs/PDMS柔性可拉伸电极照片及180°弯曲(b)和720°扭曲(c)照片; (d) Ag NWs/PDMS柔性电极表面SEM照片; (e) 截面SEM照片; (f) 局部放大SEM照片. 所有图片中Ag NWs尺寸为90 nm
图4
(网络版彩图)(a) 30 nm尺寸Ag NWs制备得到弹性导体首次100%拉伸回复后表面光学显微镜照片, 其中插图为样品50%拉伸时数码照片; (b) 表面放大光学照片; (c) 90 nm尺寸Ag NWs制备得到弹性导体100%拉伸回复后表面光学显微照片, 其中插图为样品50%拉伸时数码照片; (d) 表面高倍SEM照片
图5
不同尺寸Ag NWs印刷构成的导电网络结构浇筑PDMS前后表面形貌SEM照片. (a), (c) 30 nm; (b), (d) 90 nm; (a)和(b)为浇筑前; (c)和(d)为浇筑后; (c)和(d)的内部插图为局部放大SEM照片
图6
(网络版彩图)(a) 90 nm Ag NWs/PDMS弹性体初始拉伸回复过程示意图; (b) 初始100%拉伸回复后褶皱状表面三维结构照片; (c) 初始100%拉伸回复电阻变化曲线; (d) 初始100%拉伸回复后, 50%拉伸范围内电阻变化曲线, 插图为不同拉伸幅度电阻测试照片; (e) 印刷制备弹性导线(5 cm× 0.3 cm)不同拉伸幅度下串联LED发光照片
图7
(网络版彩图)(a) 印刷制备不同线宽可延展导线; (b) 印刷制备尺寸10 cm×10 cm可拉伸LED阵列电路; (c) LED柔性电路弯曲及扭曲照片; (d) LED柔性电路30%拉伸照片
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