文献类型：期刊文献

英文题名：A sweat-pH-enabled strongly adhesive hydrogel for self-powered e-skin applications

作者：Zhang, Lei[1,2] Wang, Siheng[1] Wang, Zhuomin[1] Huang, Zhen[2] Sun, Penghao[2] Dong, Fuhao[1] Liu, He[1] Wang, Dan[1] Xu, Xu[2]

第一作者：Zhang, Lei

通信作者：Liu, H[1];Wang, D[1];Xu, X[2]

机构：[1]Chinese Acad Forestry, Natl Engn Res Ctr Low Carbon Proc & Utilizat Fores, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Inst Chem Ind Forestry Prod,Key Lab Biomass Energy, Nanjing 210042, Jiangsu, Peoples R China;[2]Nanjing Forestry Univ, Coll Chem Engn, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Nanjing, Peoples R China

年份：0

外文期刊名：MATERIALS HORIZONS

收录：;EI(收录号：20231613900285);Scopus(收录号：2-s2.0-85152683015);WOS:【SCI-EXPANDED(收录号:WOS:000963355400001)】；

基金：This work was undertaken, in part, thanks to funding from the National Natural Science Foundation of China (Grant No. 31890774) to H. L., the Forestry Science and Technology Innovation and Extension Project of Jiangsu Province (No. LYKJ[2021]04) to H. L, and the National Natural Science Foundation of China (Grant No. 31971599) to D. W.

语种：英文

摘要：On-skin hydrogel electrodes are poorly conformable in sweaty scenarios due to low electrode-skin adhesion resulting from the sweat film formed on the skin surface, which seriously hinders practical applications. In this study, we fabricated a tough adhesive cellulose-nanofibril/poly(acrylic acid) (CNF/PAA) hydrogel with tight hydrogen-bond (H-bond) networks based on a common monomer and a biomass resource. Furthermore, inherent H-bonded network structures can be disrupted through judicious engineering using excess hydronium ions produced through sweating, which facilitate the transition to protonation and modulate the release of active groups (i.e., hydroxyl and carboxyl groups) accompanied by a pH drop. The lower pH enhances adhesive performance, especially on skin, with a 9.7-fold higher interfacial toughness (453.47 vs. 46.74 J m(-2)), an 8.6-fold higher shear strength (600.14 vs. 69.71 kPa), and a 10.4-fold higher tensile strength (556.44 vs. 53.67 kPa) observed at pH 4.5 compared to the corresponding values at pH 7.5. Our prepared hydrogel electrode remains conformable on sweaty skin when assembled as a self-powered electronic skin (e-skin) and enables electrophysiological signals to be reliably collected with high signal-to-noise ratios when exercising. The strategy presented here promotes the design of high-performance adhesive hydrogels that may serve to record continuous electrophysiological signals under real-life conditions (beyond sweating) for various intelligent monitoring systems.