Modeling Electrical Resistance Behavior of Soft and Flexible Piezoresistive Sensors Based on Carbon-Black/Silicone Elastomer Composites

Yong, Shi; Aw, Kean C.

doi:10.1007/s11220-022-00392-4

Cited by 12 publications

(7 citation statements)

References 43 publications

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“…For instance, the sensor using Ag microplates as the conductive fillers experienced a resistance change exceeding 8.4%, and the sensor based on graphite/Ni core/shell particles exhibited an even larger change of over 55%. These results are consistent with previous observations, [ 34,66–68 ] mainly attributed to the stress/strain relaxation and interfacial decohension in rigid‐soft conductors. Impressively, even after being held at 50% strain for 60 days, our sensor experienced minimal changes in resistance, with a relative increase of only 5.4% (Figure 2f; Figure S20, Supporting Information).…”

Section: Resultssupporting

confidence: 94%

Ultrasensitive, Highly Stable, and Stretchable Strain Sensor Using Gated Liquid Metal Channel

Yao,

Lü,

Wang

et al. 2024

Adv Funct Materials

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Developing stretchable strain sensors with high sensitivity and stability is crucial for various applications such as prosthetic hands, human health monitoring, and human‐machine interactions. However, achieving these qualities simultaneously remains challenging. Here, an inherently stretchable strain sensor is presented that integrates ultrahigh sensitivity and robust stability, enabling stretch, press, or bend sensing capabilities. This sensor employs a softer elastomeric channel filled with liquid metal (LM) as the conductive path. A stiffer elastomer convex integrated into the channel serves as a strain‐manipulated gate, controlling opening gap of electrical current flow path. During deformation, the softer elastomer undergoes cross sectional reduction due to the Poisson effect, while the stiffer convex gate retains its geometry. This heterogeneous deformation behavior leads to significant contraction or closure of the LM channel, resulting in increased resistance and a remarkable enhancement in sensitivity by more than two orders of magnitude. The all‐soft design maintains exceptional stability even under extended or repetitive substantial deformations. With the ability to monitor subtle and large human body movements, detect grip actions of soft grippers reliably, and monitor the gradual and extended growth process of plants, this sensor holds significant potential for advancements in flexible electronics.

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Section: Resultssupporting

confidence: 94%

Ultrasensitive, Highly Stable, and Stretchable Strain Sensor Using Gated Liquid Metal Channel

Yao,

Lü,

Wang

et al. 2024

Adv Funct Materials

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show abstract

“…Thereby, a uniaxial testing machine (Zwick Z005, Zwick/Roell GmbH & Co. KG, Ulm, Germany) including a force transducer (Zwick/Roell Xforce HP 200 N, Zwick/Roell GmbH & Co. KG, Ulm, Germany), which meets the criteria of accuracy classes according to ISO 7500-1, was used. The results showed the piezoresistive behavior typical for carbon black silicone composite [30].…”

Section: Application Examplesmentioning

confidence: 76%

Open Source Sensor Interface for Soft Detectors in Surgical Simulators

et al. 2023

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Surgical simulation is an emerging area of research and development, making new developments of especially hybrid simulators highly relevant. In this context, soft sensors enable low-cost position or force detection in haptically realistic synthetic tissue imitations to link the physical and virtual components of a patient phantom. To accelerate and facilitate the development of such simulators, an open-source sensor interface module optimized for use with soft carbon black silicone composite based sensors is presented. The module can measure complex voltages and impedances between multiple measurement channels at various frequencies. This enables up to three-dimensional tool tracking of conductive surgical instruments in patient phantoms as well as force or deformation detection at relevant structures. Several application scenarios are presented. Disruptive influences on the sensors are minimized by evaluating the signals based on discrete Fourier transform. Higher frequency signal coupling avoids contacting problems with soft sensors, which are often highly piezoresistive. Compensation functions or favorable sensor structures can largely avoid the influence of parasitic capacitances, which are particularly prevalent in low-cost electronics. The universally applicable module provides all the necessary electronics, including firmware and software interface for the subsequent processing computer. The handy module offers 17 measuring channels as well as digital inputs and outputs and is operated via USB. In addition to the evaluability of various sensor types relevant for surgical simulation, electroimpedance tomography is also supported, as demonstrated by the examples.

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“…The resistance relaxation phenomenon occurs during the process of use. This phenomenon leads to repetitive errors and hysteresis in piezoresistive sensors, leading to a significant mistake in measuring joint angles [22].…”

Section: Piezoresistive Strain Sensorsmentioning

confidence: 99%

Flexible Strain Sensors for Walking Gait Monitoring

Feng,

Shi,

Zhu

et al. 2024

Preprint

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This review delves into the growing field of flexible and stretchable strain sensors utilized in human gait analysis, focusing on determining knee bending angle and muscle activities when a human subject walks. Recent advancements have enabled these sensors to accurately capture biomechanical parameters while accommodating the body's natural movements. We examine the principles underlying these sensors' design and fabrication techniques, emphasizing their flexibility, stretchability, and biocompatibility for seamless integration into wearable systems. Through critical evaluation of existing methodologies, we assess the reliability and validity of these sensors in quantifying gait parameters. Furthermore, we discuss this technology's clinical and research implications, highlighting its potential in personalized rehabilitation and sports performance optimization. We provide an overview of flexible strain sensors and their application for analyzing human walking gait, especially for observing walking gait in rehabilitation programs. First, we present the basic working principles of various flexible strain sensors. Second, by the application of flexible strain sensors as walking gait monitoring. Finally, current challenges and future opportunities in this research area are discussed. By synthesizing current knowledge and outlining future directions, this review aims to provide insights for researchers and practitioners seeking to leverage flexible and stretchable strain sensors for comprehensive human gait analysis.

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Modeling Electrical Resistance Behavior of Soft and Flexible Piezoresistive Sensors Based on Carbon-Black/Silicone Elastomer Composites

Cited by 12 publications

References 43 publications

Ultrasensitive, Highly Stable, and Stretchable Strain Sensor Using Gated Liquid Metal Channel

Ultrasensitive, Highly Stable, and Stretchable Strain Sensor Using Gated Liquid Metal Channel

Open Source Sensor Interface for Soft Detectors in Surgical Simulators

Flexible Strain Sensors for Walking Gait Monitoring

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