The requirement of low detection and wide sensing range are urgent to be meet in the field of human motion detection and human-machine interface. Herein, the TPU electrospun film sensor...
Hydrogel, as a sensitive element of flexible sensor, can change its resistance or capacitance according to mechanical deformation and provide critical service for the Internet of Things (IOT). However, it is a challenge to fabricate a hydrogel that simultaneously possesses excellent mechanical properties and great conductivity via low‐cost and simple method. Herein, one‐pot and solution‐casting methods were adopted to fabricate hydrogel film efficiently. Phosphoric acid (H3PO4) plays the role of both proton source and plasticizer can that improves the conductivity and flexibility of hydrogel. Phytic acid(PA) with abundant hydroxyl groups can form physical crosslink with PVA(polyvinyl alcohol) chain via hydrogen bond, thus increasing rigidity. H3PO4 and PA are used for reinforcing the conductivity and mechanical properties of PVA hydrogel by exploring the best mass fraction. This hydrogel, i.e., PVA/PA/H3PO4, possesses 3500% elongation, 2500% effective sensing range, great conductivity of 4.2467 S m−1, fast response/release time(65ms/91ms), outstanding durability (10,000s) for strain sensor and great detection limit of 1250 kPa and 3.85 kPa−1 sensitivity for pressure sensor. The great performance proves that hydrogel is capable for practice applications such as identifying pressure distribution and monitoring human activity situation. This method provides a new idea for the low‐cost and large‐scale fabrication of flexible sensors.
A high-sensitivity three-core photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) is proposed in this paper. The gold film is selected as the plasmonic metal and coated on the outside surface of the PCF to excite the SPR phenomenon. There are three different diameter air holes of d1, d2, and d3 distributed on the cross-section of the sensor. Among them, sensor performance can be affected by changing the diameter of the central hole and the thickness of the gold film. The sensor shows the maximum confinement loss value and spectral sensitivity of 50 dB cm−1 and 30600 nm RIU−1, respectively, at analyte RI (na = 1.41), and the corresponding maximum resolution is 3.27 × 10–6. The above simulation result shows that the sensor has excellent performance, thus laying the foundation for future research.
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