Conductive composite hydrogels as artificial skin-like materials are receiving much attention because they hold great potential applications in personalized healthcare. However, to design and prepare a versatile material simultaneously possessing such multi-functions still remains a challenge. Herein, a robust, self-healing and self-adhesive conductive hydrogel was fabricated via forming dynamic coordination bonds between tannic acid-decorated cellulose nanocrystals (TA@CNC), partially reduced graphene oxide (pRGO) nanosheets and polyvinyl alcohol (PVA) network. The catechol groups from tannic acid imparts the hydrogel with self-adhesive capability to various substrates. Besides, the mechanical strength and electrical conductivity of the hydrogels was well balanced by incorporation of pRGO component, endowing the hydrogel with robustness and good electrical conductivity as well as decent strain-sensitivity. Benefiting from all these advantages, the conductive nanocomposite hydrogel could be used as flexible strain sensors monitoring both large (e.g., joints bending) and subtle (e.g., voice detection) human motion, in real-time. The currently reported hydrogel design gives a new perspective for the preparation of high-performance cellulose-based hydrogels that hold great potential for practical applications in wearable electronic sensors and healthcare monitoring.

导电复合水凝胶作为人造皮肤状材料受到广泛关注，因为它们在个性化医疗保健中具有巨大的潜在应用。然而，设计和制备同时具有这种多功能的通用材料仍然是一个挑战。本文中，通过在单宁酸修饰的纤维素纳米晶体（TA @ CNC），部分还原的氧化石墨烯（pRGO）纳米片和聚乙烯醇（PVA）网络之间形成动态配位键，制造了一种坚固，自愈和自粘的导电水凝胶。单宁酸中的邻苯二酚基团使水凝胶具有对各种底物的自粘能力。此外，通过掺入pRGO组分，水凝胶的机械强度和电导率得到了很好的平衡，使水凝胶具有坚固性，良好的导电性以及良好的应变敏感性。受益于所有这些优点，导电纳米复合水凝胶可以用作柔性应变传感器，实时监测大型（例如，关节弯曲）和微妙（例如，声音检测）人体运动。当前报道的水凝胶设计为高性能纤维素基水凝胶的制备提供了新的视角，该高性能水凝胶在可穿戴电子传感器和医疗保健监测的实际应用中具有巨大潜力。