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Strain Sensors with a High Sensitivity and a Wide Sensing Range Based on a Ti 3 C 2 T x (MXene) Nanoparticle–Nanosheet Hybrid Network

2019; Wiley; Volume: 29; Issue: 14 Linguagem: Inglês

10.1002/adfm.201807882

1616-3028

Yina Yang, Liangjing Shi, Zherui Cao, Ranran Wang, Jing Sun,

Advanced Memory and Neural Computing

Abstract A high sensitivity and large stretchability are desirable for strain sensors in wearable applications. However, these two performance indicators are contradictory, since the former requires a conspicuous structural change under a tiny strain, whereas the latter demands morphological integrity upon a large deformation. Developing strain sensors with both a high sensitivity (gauge factor (GF) > 100) and a broad strain range (>50%) is a considerable challenge. Herein, a unique Ti 3 C 2 T x MXene nanoparticle–nanosheet hybrid network is constructed. The migration of nanoparticles leads to a large resistance variation while the wrapping of nanosheet bridges the detached nanoparticles to maintain the connectivity of the conductive pathways in a large strain region. The synergetic motion of nanoparticles and nanosheets endows the hybrid network with splendid electrical–mechanical performance, which is reflected in its high sensitivity (GF > 178.4) over the entire broad range (53%), the super low detection limit (0.025%), and a good cycling durability (over 5000 cycles). Such high performance endows the strain sensor with the capability for full‐range human motion detection.