Multi-height micropyramids based pressure sensor with tunable sensing properties for robotics and step tracking applications

Oh, Dongik; Seo, Jungyeon; Kim, Hang Gyeom; Ryu, Chaehyun; Bang, Sang-Won; Park, Sukho; Kim, Hoe Joon

doi:10.1186/s40486-022-00149-4

Cited by 11 publications

(7 citation statements)

References 25 publications

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“…Wearable electronics, including artificial electronic skins, have attracted considerable attention for various applications, such as in human motion detection and physiological monitoring [62][63][64][65][66][67]. Flexible and stretchable physical sensors are key components for such applications, and mechanical flexibility/stretchability, high sensitivity, fast response time, and repeatability are considered as important requirements [68].…”

Section: Soft Sensorsmentioning

confidence: 99%

Carbon nanotube-graphene hybrids for soft electronics, sensors, and actuators

Pyo

Eun

Sim

et al. 2022

Micro and Nano Syst Lett

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Soft devices that are mechanically flexible and stretchable are considered as the building blocks for various applications ranging from wearable devices to robotics. Among the many candidate materials for constructing soft devices, carbon nanomaterials such as carbon nanotubes (CNTs) and graphene have been actively investigated owing to their outstanding characteristics, including their intrinsic flexibility, tunable conductivity, and potential for large-area processing. In particular, hybrids of CNTs and graphene can improve the performance of soft devices and provide them with novel capabilities. In this review, the advances in CNT-graphene hybrid-based soft electrodes, transistors, pressure and strain sensors, and actuators are discussed, highlighting the performance improvements of these devices originating from the synergistic effects of the hybrids of CNT and graphene. The integration of multidimensional heterogeneous carbon nanomaterials is expected to be a promising approach for accelerating the development of high-performance soft devices. Finally, current challenges and future opportunities are summarized, from the processing of hybrid materials to the system-level integration of multiple components.

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Section: Soft Sensorsmentioning

confidence: 99%

Carbon nanotube-graphene hybrids for soft electronics, sensors, and actuators

Pyo

Eun

Sim

et al. 2022

Micro and Nano Syst Lett

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“…The multiwalled carbon nanotube (MWCNT) has a high aspect ratio and excellent electrical properties [50,51] and is thus used in various studies. [26,52,53] The swelling-coat-shrinkage method integrates a layer of MWCNT coating on the 3D-printed gyroid structure to render it electrically conductive. The mechanical properties of the gyroid structure at different relative densities are characterized through compressive tests and computational simulations.…”

Section: Introductionmentioning

confidence: 99%

Additively Manufactured Mechanical Metamaterial‐Based Pressure Sensor with Tunable Sensing Properties for Stance and Motion Analysis

et al. 2023

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Mechanical metamaterials are attracting considerable attention due to their unique properties not found in natural materials. Advanced geometrical shapes such as Menger cubes, origami templates, and gyroids offer exciting avenues for device engineering. In addition, the recent developments of various additive manufacturing technologies have expanded materials selection and geometrical complexities. Herein, a piezoresistive pressure sensor based on a 3D‐printed gyroid structure with a conformal coating of carbon nanotubes (CNTs) is presented. The gyroid structures are printed using fused deposition modeling (FDM) 3D printing with thermoplastic polyurethane (TPU), providing mechanical robustness even at low densities. By altering the relative density of the gyroid structure, Young's modulus can be tailored, ranging from 0.32 MPa at 30% relative density and 3.61 MPa at 80% relative density. The presented gyroid‐based pressure sensor achieves a wide sensing range of up to 1.45 MPa and a high sensitivity of 2.68 MPa−1. The sensor is integrated into a shoe for wearable applications, demonstrating its mechanical robustness and potential for human stance and motion monitoring.

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“…To achieve higher sensing performance, extensive researchers focused on the design of microstructure patterns on the elastomer surface. In the past decades, various micro/nanostructures on elastomers, such as micropillars, microdomes, micropyramids, microcilia, and porous structures, have been reported. − The conductive materials can be either mixed in the flexible matrix or coated on a microstructure surface to form the piezoresistive layer. , Owing to the sharp features of microstructures, the piezoresistive layer sandwiched between electrodes can provide remarkable variation in contact area under pressures, which accordingly raises the dramatically changed contact resistance to improve the sensitivity. However, the high sensitivity of the sensors is effective only in low-pressure regions, as the deformation of these microstructures will be saturated rapidly with increased pressure, resulting in a restricted linearity range.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Optimization of Sensitivity and Linearity for Flexible Pressure Sensor via Coupling Effect between Microstructures and Flat Substrate Component

Liu,

Ji,

Lei

et al. 2023

ACS Appl. Electron. Mater.

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Flexible piezoresistive pressure sensors with the advantages of a simple structure and facile signal acquisition have attracted considerable interest in various application fields. Although the piezoresistive layers have been widely explored to develop high-performance sensors, the trade-off between sensitivity and linearity has yet to be fully resolved. In this work, a CNT/ PDMS-based piezoresistive layer with the coupling effect of the microdomes and the flat substrate component is proposed to simultaneously optimize the sensitivity and linearity range of piezoresistive sensors. Different from conventional dome-based piezoresistive layers, the microdomes and substrate of the proposed layer can be codeformed to compensate for the resistance variation attenuation resulting from the stiffening effect of compressed soft materials. Upon the appropriate conductivity and elastic modulus of the piezoresistive layer, the sensitivity and linearity range of the sensor can be improved simultaneously. Moreover, the coupling effect of the microdomes and the substrate can be regulated by constructing gradient conductivity and elastic modulus, which enables further optimization of the sensing performance with a high sensitivity of 70.42 kPa −1 in an ultrawide linearity range of 0−950 kPa (R 2 = 0.99). The excellent sensing performance enables the sensor as a diverse wearable platform, which can not only precisely monitor various physiological signals (e.g., finger bending, walking, running, etc.) but also transmit Morse code information by simply switching the finger bending behaviors. We believe that the proposed sensor along with the optimization strategy can be of great potential for developing high-performance piezoresistive sensors for versatile wearable applications in the future.

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Multi-height micropyramids based pressure sensor with tunable sensing properties for robotics and step tracking applications

Cited by 11 publications

References 25 publications

Carbon nanotube-graphene hybrids for soft electronics, sensors, and actuators

Carbon nanotube-graphene hybrids for soft electronics, sensors, and actuators

Additively Manufactured Mechanical Metamaterial‐Based Pressure Sensor with Tunable Sensing Properties for Stance and Motion Analysis

Simultaneous Optimization of Sensitivity and Linearity for Flexible Pressure Sensor via Coupling Effect between Microstructures and Flat Substrate Component

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