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411 results on '"Su, Yuanjie"'

4. High-performance piezoelectric composites via β phase programming

Author

Su, Yuanjie, Li, Weixiong, Cheng, Xiaoxing, Zhou, Yihao, Yang, Shuai, Zhang, Xu, Chen, Chunxu, Yang, Tiannan, Pan, Hong, Xie, Guangzhong, Chen, Guorui, Zhao, Xun, Xiao, Xiao, Li, Bei, Tai, Huiling, Jiang, Yadong, Chen, Long-Qing, Li, Fei, and Chen, Jun

Subjects
Bioengineering, Affordable and Clean Energy, Nanofibers, Polymers
Abstract

Polymer-ceramic piezoelectric composites, combining high piezoelectricity and mechanical flexibility, have attracted increasing interest in both academia and industry. However, their piezoelectric activity is largely limited by intrinsically low crystallinity and weak spontaneous polarization. Here, we propose a Ti3C2Tx MXene anchoring method to manipulate the intermolecular interactions within the all-trans conformation of a polymer matrix. Employing phase-field simulation and molecular dynamics calculations, we show that OH surface terminations on the Ti3C2Tx nanosheets offer hydrogen bonding with the fluoropolymer matrix, leading to dipole alignment and enhanced net spontaneous polarization of the polymer-ceramic composites. We then translated this interfacial bonding strategy into electrospinning to boost the piezoelectric response of samarium doped Pb (Mg1/3Nb2/3)O3-PbTiO3/polyvinylidene fluoride composite nanofibers by 160% via Ti3C2Tx nanosheets inclusion. With excellent piezoelectric and mechanical attributes, the as-electrospun piezoelectric nanofibers can be easily integrated into the conventional shoe insoles to form a foot sensor network for all-around gait patterns monitoring, walking habits identification and Metatarsalgi prognosis. This work utilizes the interfacial coupling mechanism of intermolecular anchoring as a strategy to develop high-performance piezoelectric composites for wearable electronics.

Published
2022

18. Degradable Multilayer Fabric Sensor with Wide Detection Range and High Linearity

Author

Huang, Junlong, Xie, Guangzhong, Xu, Xiangdong, Geng, Zhenya, and Su, Yuanjie

Abstract

Integration of multiple superior features into a single flexible pressure sensor would result in devices with greater versatility and utility. To apply the device to a variety of scenarios and solve the problem of accumulation of e-waste in the environment, it is highly desirable to combine degradability and wide-range linearity characteristics in a single device. Herein, we reported a degradable multilayer fabric (DMF) consisting of an ellipsoidal carbon nanotube (ECNT) and polyvinylpyrrolidone/cellulose acetate electrospun fibers (PEF). The alternative layer-by-layer stacking of the ECNT and PEF notably accelerates the sensitivity toward pressure. The optimized device demonstrated a sensitivity of 3.38 kPa–1over a wide measurement range from 0.1 to 500 kPa, as well as great mechanical stability over 2000 cycles. A good degradation performance was confirmed by both Fourier transform infrared (FTIR) characterization and decomposition experiments in sodium hydroxide solution. The fabricated sensor is capable of precepting a variety of physiological scenarios including subtle arterial pulse, dancing training, walking postures, and accidental falls. This work throws light onto the fundamental understanding of the mechanical interfacial coupling in piezoresistive materials and provides possibilities for the design and development of on-demand wearable electronics.

Published
2024
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42. Hierarchical piezoelectric composite film for self-powered moisture detection and wearable biomonitoring.

Author

Dai, Jing, Xie, Guangzhong, Chen, Chunxu, Liu, Yulin, Tai, Huiling, Jiang, Yadong, and Su, Yuanjie

Subjects
PIEZOELECTRIC composites, PIEZOELECTRIC thin films, LEAD titanate, BIOLOGICAL monitoring, POLYIMIDE films, MOISTURE
Abstract

Moisture detection plays a crucial role in physiological monitoring and wearable electronics. Nevertheless, most of the humidity sensors were restricted by the power supply, hindering their applicability in internet of things and mobile healthcare. Herein, we reported a hierarchical piezoelectric composite film for active humidity detection and wearable biomonitoring. The as-electrospun piezoelectric transducing textile consists of samarium-modified lead magnesium niobate lead titanate piezoceramic fillers and polyvinylidene fluoride matrix, while the spin coated polyimide film serves as the humidity sensitive layer. By tuning the thickness ratio between transducing layer and the humidity sensing layer as well as the porosity of the electrode, an optimal moisture-sensing performance was accomplished with a high response of ∼500% and rapid response/recovery time of 23 s/31 s. Furthermore, a theoretical modeling of active humidity sensing mechanism was established by combining thermodynamic derivation and finite element calculation. [ABSTRACT FROM AUTHOR]

Published
2024
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