Hydrogels with integrated attributes of stretchability, conductivity, transparency and robustness have been emerging because of their promising applications in wearable devices, human health monitoring, advanced intelligent systems and energy harvesting. In this paper, we developed stretchable and conductive hydrogels via hybrid double networks approach by combination of rigid physically cross-linked gelatin, tough chemically cross-linked polyacrylamide (PAM) and poly(3,4-ethylene dioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) as conducting component. The double networks can be further interlocked by using physical entanglements and abundant dynamic hydrogen bonds, contributing to the improved mechanical properties and self-recovery ability. A transparent and wearable strain sensor is fabricated by sandwiching the hydrogels with two layers of adhesive polyurethane (PU) tape, exhibiting good sensitivity (gauge factor (GF) = 1.58), ultra-wide sensing range of 0-2850% strain, short response time of 200 ms and superior durability and reproducibility (1200 cycles), which endows the sensitive monitors with effective discernibility for detecting intricate human motions. Importantly, the hydrogel-based device can act as a highly stretchable (300% strain) triboelectric nanogenerator (STENG) for efficient energy harvesting, giving a short circuit current (I_SC) of 26.9 μA, open circuit voltage (V_OC) of 383.8 V and short-circuit transferred charge (Q_SC) of 92 nC. The integrated abilities of strain sensing and energy harvesting promise the hydrogels for high performance self-powered wearable devices and stretchable power sources.

具有可伸缩性，导电性，透明性和坚固性等综合属性的水凝胶已经出现，因为它们在可穿戴设备，人体健康监测，先进的智能系统和能量收集中的应用前景广阔。在本文中，我们通过将刚性物理交联的明胶，强韧的化学交联的聚丙烯酰胺（PAM）和聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）结合使用混合双网络方法开发了可拉伸和导电的水凝胶。 （PEDOT：PSS）作为导电成分。通过使用物理缠结和丰富的动态氢键，双链网络可以进一步互锁，从而有助于改善机械性能和自我恢复能力。通过将水凝胶夹在两层聚氨酯胶带（PU）中间，制成透明且耐磨的应变传感器，具有良好的灵敏度（仪表系数（GF）= 1.58），0至2850％应变的超宽感应范围，响应时间短200毫秒的时间以及出色的耐用性和可重复性（1200个周期），这赋予了灵敏的监视器有效的识别力，可检测复杂的人体运动。重要的是，基于水凝胶的装置可以充当可伸缩性高（300％应变）的摩擦电纳米发电机（STENG），以有效地收集能量，从而产生短路电流（I 赋予灵敏的监视器有效的识别力，可检测复杂的人体运动。重要的是，基于水凝胶的装置可充当可伸缩性高（300％应变）的摩擦电纳米发电机（STENG），以有效地收集能量，从而产生短路电流（I 赋予灵敏的监视器有效的识别力，可检测复杂的人体运动。重要的是，基于水凝胶的装置可以充当可伸缩性高（300％应变）的摩擦电纳米发电机（STENG），以有效地收集能量，从而产生短路电流（I_SC）为26.9μA，开路电压（V _OC）为383.8 V，短路转移电荷（Q _SC）为92 nC。应变感应和能量收集的综合能力使水凝胶成为高性能自供电可穿戴设备和可伸缩电源的理想选择。