Peel‐Transferable Omnidirectional Strain Sensor Via Screen‐Printed MWCNT‐OH/Ecoflex and Spray‐Coated c‐MOF/PEDOT Functional Layers

ABSTRACT Omnidirectional strain sensors capable of detecting large and complex deformations are highly promising for wearable motion monitoring; however, achieving both multidirectional strain perception and enhanced electrical sensitivity remains challenging. Herein, a peelable circular piezoresistive strain sensor based on KH570‐modified hydroxylated multi‐walled carbon nanotubes (m‐MWCNT‐OH)/Ecoflex is developed through a screen‐printing strategy and further functionalized with a copper (II) 2,3,6,7,10,11‐hexahydroxytriphenylene (Cu 3 (HHTP) 2 ) conductive metal‐organic framework (c‐MOF)/poly(3,4‐ethylenedioxythiophene) nanofiber (PEDOT‐NFs) nanolaminate. The circular sensing architecture facilitates uniform strain distribution and orientation‐independent strain transfer, while the c‐MOF/PEDOT‐NFs coating constructs additional conductive pathways, enhancing strain‐induced resistance variation. The sensor is fabricated using a sequential process involving screen printing of the m‐MWCNT‐OH/Ecoflex sensing layer, peel transfer, and spray deposition of the functional coating. The resulting sensor demonstrates a wide strain detection range of 0%–300%, a gauge factor (GF) of 8, a fast response time of 33 ms, a recovery time of 420 ms, and stable performance over 10 000 loading‐unloading cycles. Compared with unmodified sensor, c‐MOF/PEDOT‐NFs functionalization significantly improves electrical sensitivity while maintaining the intrinsic omnidirectional sensing capability. Finite element analysis (FEA) confirms similar strain‐transfer characteristics under different loading directions. The sensor enables accurate monitoring of multidirectional human motions, highlighting its potential for wearable electronics, soft robotics, and human‐machine interfaces.