Dielectric micro-capacitance for enhancing piezoelectricity via aligning MXene sheets in composites

Tian, Guo; Deng, Weili; Xiong, Deping; Yang, Tao; Zhang, Binbin; Ren, Xiarong; Lan, Boling; Shen, Zhong; Jin, Long; Zhang, Hongrui; Deng, Lin; Yang, Weiqing

doi:10.1016/j.xcrp.2022.100814

Cited by 48 publications

(25 citation statements)

References 41 publications

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“…Recently, the flexible sensors − that can detect subtle physical quantities of solid, liquid, and gas phases change and obtain real-time output signals have been extensively studied for their potential use in wearable electronic skins, − health monitoring systems, − and human–machine interfaces. − As an important branch of flexible sensors, the flexible piezoresistive sensor is in high demand due to its simple manufacture and easy signal acquisition. There is a great need to obtain flexible, highly sensitive, and stable piezoresistive sensors.…”

Section: Introductionmentioning

confidence: 99%

Carbon Black/Graphene Nanosheet Composites for Three-Dimensional Flexible Piezoresistive Sensors

Xiao

Guo

et al. 2022

ACS Appl. Nano Mater.

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Recently, more and more conductive nanocomposites are used to enhance the sensing characteristic of flexible sensors. However, the influence of the composite structure of nanocomposites on the performance of the sensor is rarely investigated. Herein, two composite structures of carbon black (CB)/graphene nanosheets (GNs) are used for three-dimensional flexible piezoresistive sensors. Based on the composite structures of CB and GNs, three flexible piezoresistive sensors with the nanocomposites of CB and GNs are fabricated. Experimental results show that different composite structures of CB and GNs result in several times differences in sensitivity and gauge factor. Among three samples, the sensor with the composite structure (first coating GNs and then filling CB in the SEBS substrate surface) exhibits the highest sensitivity of 197.56 kPa −1 (below 300 Pa) and gauge factor (GF) of 47.60. Meanwhile, the sensor shows a fast response of 120 ms, instant recovery of 63 ms, and excellent stability (>2000 cycles). In addition, the sensor's potential applications in monitoring speaking and gesturing are demonstrated. This work provides a strategy to obtain a highly sensitive piezoresistive sensor with conductive nanocomposites.

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Section: Introductionmentioning

confidence: 99%

Carbon Black/Graphene Nanosheet Composites for Three-Dimensional Flexible Piezoresistive Sensors

Xiao

Guo

et al. 2022

ACS Appl. Nano Mater.

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“…Polymer-piezoceramic systems have been widely employed for improved piezoelectric output and sensing performance as a result of the large stress concentration on the hard piezoelectric filler . A microcapacitor-like generator (BT) in the composites can release electric energy during the deformation, which was the main origin of the piezoelectric output of the piezocomposites. , Especially, the loading fillers with unique shapes demonstrated several aspects of superior behavior compared to regular-shaped ones. To investigate the overall superiority of bionic structured ZnO- g -BT in the PVDF matrix, the structure, mechanical, and electric performance of the composites were systematically researched.…”

Section: Resultsmentioning

confidence: 99%

Bionic Interlocking-Structured Polyvinylidene Fluoride/Zinc Oxide-Grafting Barium Titanate for Energy Harvesting and Tire Pressure Monitoring

Guo

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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Energy scavenging from irregular human motion and the value-added application for a broad range of pressure sensing are gaining attention in wearable electronics and artificial intelligent systems. Here, we designed a bionic interlocking-structured polyvinylidene fluoride/zinc oxide-grafting barium titanate (PVDF/ZnO-g-BT) piezoelectric nanogenerator (PENG) for energy harvesting from human motion and tire pressure monitoring. First, a two-step hydrothermal method was utilized to align uniformly distributed ZnO nanowires onto the BT surface, forming bionic “sea-urchin” (SU) structured ZnO-g-BT. The ZnO nanowires that aligned on the surface can collaborate to facilitate the deformation of BT and endow the molded PVDF/ZnO-g-BT composites with some figures of merit, such as a fast piezoelectric response of ∼61 ms, superior sensing sensitivity of ∼130 mv/kPa, and excellent stability. Taking advantage of these, the potential application was explored by mechanical energy harvesting from irregular human motion and tire pressure sensing. The excellent electric performance enabled in-time feedback of various useful signals, directing for human motion and tire pressure monitoring. Due to the universal applicability of polydopamine (PDA) coating on any irregular-shaped matrix and easy fabrication of following hydrothermal growing of ZnO nanowires onto the PDA surface, this micro/nano-structure design method can be extended easily to any other organic or inorganic matrix for advanced applications. Undoubtedly, this work provides a simple structure design perspective toward multifunctional wearable electronics and opens a new avenue for piezoelectric sensing.

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“…The promising applications of flexible and wearable pressure sensors in the fields of personal health monitoring, human-computer interaction, and intelligent robotics have attracted a great deal of research interest because of their superb real-time sensing capabilities, high integration potential, and good conformability to skin. [1][2][3][4][5][6] Usually, the performance of a flexible pressure sensor is evaluated in terms of sensitivity, response speed, and detection limit. 7,8 Optimizing the microstructure of flexible substrates and the conductivity of active materials are common and effective strategies to improve the sensing performance of pressure sensors.…”

Section: Introductionmentioning

confidence: 99%

Versatile MXene integrated assembly for piezoresistive micro‐force sensing

Wang

Lan

Gao

et al. 2022

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MXenes have received tremendous attention for flexible electronics owing to their excellent conductivity, water dispersibility, and mechanical flexibility. However, the sediment from the MXene production process is usually discarded as trash, resulting in low utilization. Here, we present a flexible pressure sensor that enables micro-force sensing and efficient utilization of MXene by confining MXene trash among structured MXene electrodes. Benefiting from the synergistic effect of both the confined micro-conical structure and easily changeable space of MXene trash, the as-designed device can detect extremely subtle pressure of 2.9 Pa, deliver a high sensitivity over 4.08 kPa −1 , and exhibit a remarkably fast response time (7 ms). These properties make it suitable for monitoring weak force signals from human wrist pulse and even for detecting dynamic responses associated with acoustic waves. This work provides a reference for the versatile and efficient application of MXene in the same device, showing great potential for sustainable production of next-generation wearable smart electronics.

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Dielectric micro-capacitance for enhancing piezoelectricity via aligning MXene sheets in composites

Cited by 48 publications

References 41 publications

Carbon Black/Graphene Nanosheet Composites for Three-Dimensional Flexible Piezoresistive Sensors

Carbon Black/Graphene Nanosheet Composites for Three-Dimensional Flexible Piezoresistive Sensors

Bionic Interlocking-Structured Polyvinylidene Fluoride/Zinc Oxide-Grafting Barium Titanate for Energy Harvesting and Tire Pressure Monitoring

Versatile MXene integrated assembly for piezoresistive micro‐force sensing

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