3D Printing of Anisotropic Piezoresistive Pressure Sensors for Directional Force Perception

Liu, Jingfeng; Zhang, Xuan; Liu, Jintao; Liu, Xingang; Zhang, Chuhong

doi:10.1002/advs.202309607

Cited by 8 publications

(1 citation statement)

References 34 publications

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“…In recent times, there have been numerous attempts to design flexible piezoresistive pressure sensors that are more sensitive, have a faster response time, and have a wide operating range [14]. Based on different process designs and material innovations, a growing number of manufacturing techniques are now available for the production of polymer strain/pressure sensors [15,16]. However, when the sensors are used for human body detection, it is difficult to satisfy the high sensitivity, fast response, and wide operating range with waterproof performance.…”

Section: Introductionmentioning

confidence: 99%

Flexible Nanofiber Pressure Sensors with Hydrophobic Properties for Wearable Electronics

Liu,

Wang,

Chen

et al. 2024

Materials

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In recent years, flexible pressure sensors have received considerable attention for their potential applications in health monitoring and human–machine interfaces. However, the development of flexible pressure sensors with excellent sensitivity performance and a variety of advantageous characteristics remains a significant challenge. In this paper, a high-performance flexible piezoresistive pressure sensor, BC/ZnO, is developed with a sensitive element consisting of bacterial cellulose (BC) nanofibrous aerogel modified by ZnO nanorods. The BC/ZnO pressure sensor exhibits excellent mechanical and hydrophobic properties, as well as a high sensitivity of −15.93 kPa−1 and a wide range of detection pressure (0.3–20 kPa), fast response (300 ms), and good cyclic durability (>1000). Furthermore, the sensor exhibits excellent sensing performance in real-time monitoring of a wide range of human behaviors, including mass movements and subtle physiological signals.

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Section: Introductionmentioning

confidence: 99%

Flexible Nanofiber Pressure Sensors with Hydrophobic Properties for Wearable Electronics

Liu,

Wang,

Chen

et al. 2024

Materials

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Electrospinning of porous polyvinylidene fluoride microspheres alloyed fibrous membrane with enlarged strain for efficient piezoelectric energy harvesting

Zhang,

Shao,

Liu

et al. 2024

Journal of Polymer Science

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Piezoelectric energy harvesters (PEHs) developed from electrospun polyvinylidene fluoride (PVDF) fibers offer flexibility and superior piezoelectric output, making them promising for self‐powered systems and sensors. Nonetheless, the electromechanical conversion efficiency of conventional electrospun PVDF fibers is impeded by their limited pressure‐strain range. Herein, elastic porous PVDF microspheres are introduced in‐situ via electrospinning to craft a piezoelectric membrane with higher compressive strain. The PVDF microspheres are uniformly embedded between the fibers in a sandwich fashion, and their dimension is easily tunable by varying spinning solution's concentration. Moreover, the micropores on the PVDF microspheres created by removing pre‐mixed SiO2 template not only elevates the β crystal content of PVDF to 82.19%, but also improves the compressibility, significantly boosting the piezoelectric output. The microsphere alloyed PVDF PEH delivers a piezoelectric output of 33.0 V and a power density of 8 μW/cm2, over 5.8 times that of conventional electrospun PVDF membrane, and can consistently charge lithium‐ion batteries. Our research unveils a novel strategic path to modify fiber structured PEHs, advancing their applications in self‐powered systems.

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Ultra-High Sensitivity Anisotropic Piezoelectric Sensors for Structural Health Monitoring and Robotic Perception

Yin,

Li,

Tian

et al. 2024

Nano-Micro Lett.

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Monitoring minuscule mechanical signals, both in magnitude and direction, is imperative in many application scenarios, e.g., structural health monitoring and robotic sensing systems. However, the piezoelectric sensor struggles to satisfy the requirements for directional recognition due to the limited piezoelectric coefficient matrix, and achieving sensitivity for detecting micrometer-scale deformations is also challenging. Herein, we develop a vector sensor composed of lead zirconate titanate-electronic grade glass fiber composite filaments with oriented arrangement, capable of detecting minute anisotropic deformations. The as-prepared vector sensor can identify the deformation directions even when subjected to an unprecedented nominal strain of 0.06%, thereby enabling its utility in accurately discerning the 5 μm-height wrinkles in thin films and in monitoring human pulse waves. The ultra-high sensitivity is attributed to the formation of porous ferroelectret and the efficient load transfer efficiency of continuous lead zirconate titanate phase. Additionally, when integrated with machine learning techniques, the sensor’s capability to recognize multi-signals enables it to differentiate between 10 types of fine textures with 100% accuracy. The structural design in piezoelectric devices enables a more comprehensive perception of mechanical stimuli, offering a novel perspective for enhancing recognition accuracy.

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3D Printing of Anisotropic Piezoresistive Pressure Sensors for Directional Force Perception

Cited by 8 publications

References 34 publications

Flexible Nanofiber Pressure Sensors with Hydrophobic Properties for Wearable Electronics

Flexible Nanofiber Pressure Sensors with Hydrophobic Properties for Wearable Electronics

Electrospinning of porous polyvinylidene fluoride microspheres alloyed fibrous membrane with enlarged strain for efficient piezoelectric energy harvesting

Ultra-High Sensitivity Anisotropic Piezoelectric Sensors for Structural Health Monitoring and Robotic Perception

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