Wei Chen,Xiuchuan Jing,Zhuang Li,Haiqing Miao,Zhong Wang
In this study, the carbon quantum dots/thermoplastic polyurethane (CQDs/TPU) flexible composite film is prepared by solvent and electrospinning methods. The effects of CQDs concentrations on the microstructure, mechanical property, breathable moisture-permeable property, and sensing performance of the composite films are investigated. Results show that the composite film prepared by solvent method has a large strain range, and its sensitivity increases with strain, but exhibits poor breathable moisture-permeable property and linearity. The fibers inside the electrospinning composite membrane are arranged in a staggered manner to form a good three-dimensional conductive network. As the concentration of CQDs increases, the tensile strength at break gradually decreases and the tensile strength at break gradually increases. The composite film has good breathability and moisture permeability, with a maximum air permeability of 2.44 L/(m 2 ·s). The electrospinning method composite film has a smaller strain range but high sensitivity with a GF value of up to 53.3, better linearity, superior breathable moisture-permeable property and 4.67 times of air permeability compared to the composite film by solvent method.
Wang Peng,Liu Gengsheng,Sun Guifen,Meng Chuizhou,Shen Guozhen,Li Yang
Bulky external power supplies largely limit the continuous long-term application and miniaturization development of smart sensing devices. Here, we fabricate a flexible and wearable integrated sensing system on an electrospun all-nanofiber platform. The three parts of the sensing system are all obtained by a facile ink-based direct writing method. The resistive pressure sensor is realized by decorating MXene sheets on TPU nanofiber. And, the resistive temperature sensor is prepared by compositing MXene sheets into poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). The thin-film zinc–air battery (ZAB) includes an interdigital zinc–air electrode that is bonded with a gel polymer electrolyte. It can supply a high open-circuit voltage of 1.39 V and a large areal capacity of 18.2 mAh cm −2 for stable and reliable power-supplying sensing parts operation. Thanks to the hydrophobic nature of TPU and open-ended micropores in the TPU nanofiber, the sensing system is waterproof, self-cleaning, and air and moisture permeable. For application, the above-mentioned functional components are seamlessly integrated into an intelligent electronic wristband, which is comfortably worn on a human wrist to monitor pulse and body temperature in real time with continuous operation of up to 4 h. By the novel design and remarkable performance, the proposed integrated all-nanofiber sensing system presents a promising solution for developing advanced multifunctional wearable electronics. Graphical Abstract We developed an integrated sensing system on a flexible and breathable thermoplastic polyurethane nanofiber platform. The sensing system is realized by a direct write technology and includes a pressure sensor, temperature sensor, and rechargeable zinc–air battery. The integrated sensing system was designed for wristbands and demonstrated to accurately detect pulse beating and skin temperature under different states for up to 4 hours of wearing.
危险品化学品经营许可证（带存储）