ABSTRACT Flexible ionic temperature sensors hold great promise for wearable applications but are hindered by sluggish response and insufficient sensitivity. Herein, we develop a high‐performance polyacrylamide (PAM) hydrogel‐based temperature sensor by integrating single‐walled carbon nanotube (SWCNT) ion channels and tailored zinc ion gradients, stabilized by a sodium alginate semipermeable membrane. SWCNTs reduce the activation energy of Zn 2 + migration and provide low‐tortuosity pathways, while the ion gradient lowers migration barriers and enhances directional transport. Their synergy yields a high sensitivity of 10.2%/°C, an ultrafast response/recovery time of 0.9/0.98 s, a detection limit of 0.01°C, and stable performance over 140 cycles. Powered by a flexible zinc‐ion battery (16.2 Wh m − 2 , 84.5% capacity retention at 180° bending), the sensor enables cordless monitoring in cold chain logistics, battery thermal management, and human respiratory sensing. Additionally, it exhibits antibacterial activity against Staphylococcus aureus (≈40% microbial biomass reduction compared to the control) and accelerates wound healing via downregulating IL‐6 and TNF‐α, offering a versatile platform for intelligent monitoring and biomedical engineering.
Li et al. (Fri,) studied this question.