The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, University of Chinese Academy of Sciences , 1295 Dingxi Road, Shanghai 200050, P.R. China.
ACS Appl Mater Interfaces. 2016 Apr 13;8(14):9297-304. doi: 10.1021/acsami.5b11143. Epub 2016 Mar 31.
Stretchable electronics have progressed greatly and have found their way into various applications, thus resulting in a growing demand for high-quality stretchable conductors. Poly(dimethylsiloxane) (PDMS) is the mostly frequently exploited elastomeric substrate for the construction of a stretchable and conductive platform because of its valuable features, such as superb stretch ability, high transparency, and reliable biocompatibility. However, the weak adhesion between the PDMS substrate and the conductive components has always been an intractable issue which undermines the good and stable performance of the resultant devices. We proposed a quasi in situ polymerization method to effectively build a tight and stable attachment between copper nanowire (Cu NW) and the PDMS substrate. The Cu NWs/PDMS conductors show excellent conductivity and antioxidation stability (R/R0 < 1.4 for 50 days in air), enhanced interface adhesion, and stretch ability (80% strain, R/R0 ∼ 5), without any complicated preconfiguration of the PDMS substrates. For application demonstration, the Cu NWs/PDMS conductor was deployed as the stretchable electric wiring to illuminate a light-emitting diode. Furthermore, a stretchable capacitive strain sensor was fabricated using the Cu NWs/PDMS as electrodes. The sensor possessed a gauge factor of 0.82 and the minimum detection limit of 1% strain.
可拉伸电子产品取得了重大进展，已经应用于各种领域，因此对高质量可拉伸导体的需求也在不断增长。聚二甲基硅氧烷（PDMS）因其具有卓越的拉伸能力、高透明度和可靠的生物相容性等有价值的特性，是构建可拉伸和导电平台最常使用的弹性体基底。然而，PDMS 基底与导电组件之间较弱的附着力一直是一个棘手的问题，这会影响到器件的良好和稳定性能。我们提出了一种准原位聚合方法，可有效构建铜纳米线（Cu NW）和 PDMS 基底之间的紧密且稳定的连接。Cu NW/PDMS 导体表现出优异的导电性和抗氧化稳定性（在空气中 50 天内的 R/R0<1.4）、增强的界面附着力和拉伸能力（80%应变，R/R0∼5），而无需对 PDMS 基底进行任何复杂的预处理。作为应用演示，Cu NW/PDMS 导体被用作可拉伸电线来点亮发光二极管。此外，使用 Cu NW/PDMS 作为电极制造了一种可拉伸电容应变传感器。该传感器的灵敏度系数为 0.82，最小检测限为 1%的应变。
