Shaohui Zhang,Chao Wang,Liuyi Ding,Long Zhang,Jiafan Chen,Hui Huang,Dapeng Jiang,Ziyang Chen,Gebo Pan
Flexible wearable electronics, including monitors, supercapacitors, sensors and batteries, especially stress or strain sensors, have attracted extensive discussion and attention, due to their distinctive characteristics such as high sensitivity and ultra-flexibility, and their broad application prospects in artificial intelligence (AI), robot sensing interfaces, and also high precision medical instruments. However, a narrower deformation rate, higher latency, and even counterfeit sensitivity severely limit their sensing performance and popularity in practical applications. Herein, a new bifunctional sensor based on excellent conductive and biocompatible porous copper nanowire (CuNW)/IonGel (PCI) composite films introducing a polystyrene (PS) microsphere template is developed. The sensor exhibits unparalleled mechanical properties (the maximum extension rate is 8000%), as well as omnidirectional, arbitrary angle/dimension extension, distortion and bending. This piezo-resistive sensor also features a convincing ultra-high sensitivity (S, 72.1 kPa−1) and gauge factor (Gf, 28.5) with negligible hysteresis under repeated cycle tests. Furthermore, compared to the same type of sensor, the limit of detection (LOD) is drastically reduced (merely 0.14 Pa). Undoubtedly, it is promising for high-resolution strain/stress-sensing electronic skin (e-skin) and green super-stretched electrodes.
Chenjian Li,Shixian Zhang,Feng Zhao,Zhiwei Ye,Yuhen Fu,Chuanxi Xiong,Xueliang Jiang,Junlong Yao
Organic magnets possess broad application prospects in electromagnetic wave (EW) absorbing materials (EAMs) due to their special electromagnetic properties, lightweight nature and good compatibility. Thus, in this paper, an innovative organic magnet, magnetic iongel (C12IMSO3[FeCl4]), was successfully fabricated through the self-assembly of an alkyl long-chain imidazolium zwitterion (C12IMSO3) and a magnetic ionic liquid (Bmim[FeCl4]). EWs were absorbed via various attenuating routes in C12IMSO3[FeCl4], such as ionic conductive, polarization and magnetic loss. The minimum reflect loss (RLmin) and effective absorption bandwidth (EAB) of the C12IMSO3[FeCl4] EW absorber could reach −35 dB and 1.8 GHz, respectively. After being combined with CNTs and further introducing strong electric conductive loss, the C12IMSO3[FeCl4]/CNT composition showed more advanced EW absorption properties, especially in terms of the EAB; C12IMSO3[FeCl4]/CNT achieved an EAB of 7.44 GHz at a small thickness of 2.2 mm. The ultra-broadband EW absorption performance of the C12IMSO3[FeCl4]/CNT composite transcends many reported inorganic magnetic EW absorbing composites, providing a new approach to broadband EW absorbing materials.
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