Skin-Inspired Humidity and Pressure Sensor with a Wrinkle-on-Sponge Structure

Miao, Liming; Wan, Ji; Song, Yu; Guo, Hang; Chen, Haotian; Cheng, Xiaoliang; Zhang, Haixia

doi:10.1021/acsami.9b13383

Cited by 96 publications

(69 citation statements)

References 44 publications

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“…[1][2][3][4] Flexible and stretchable electronic systems having skin-like receptor capabilities have become the emphasis of the rapid development research field, namely e-skin. [5][6][7] E-skin should imitate closely sensing capabilities of the skin; in addition, achieving e-skin will count on the development of flexible sensors, such as pressure sensors [8,9] and temperature sensors, [10,11] humidity sensors, [12,13] and strain sensors. [14,15] The sensitivity of pressure sensors is based on mechanical stimuli, which are typically utilized to monitor body motions and physiological actions, such as pulse, breath, heartbeat, and so forth.…”

Section: Introductionmentioning

confidence: 99%

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Recent Progress in Flexible Pressure Sensors Based Electronic Skin

2021

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In recent years, implantable electronics, electronic skin (e-skin), and flexible wearable devices have been developed due to their extensive applications in health monitoring, intelligent robots, and human disease treatment. Tactile sensors are the keys necessary to build skin-inspired electronics. This article reviews the latest progress of e-skin-based flexible pressure sensors, such as piezoresistivity, capacitance, triboelectricity, and piezoelectricity from 2018 up to now. The working principles, structure design, active materials, and performance of numerous flexible pressure sensors are covered in detail. Finally, insights are provided and challenges and future perspectives of flexible pressure sensors in practical applications are discussed.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Recent Progress in Flexible Pressure Sensors Based Electronic Skin

2021

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“…Harvesting energy from ambient environment or human motion is one of most promising strategies to compensate the deficiencies of battery ( Li et al., 2020a , 2020b ; Zhang et al., 2018 ; Liu et al., 2020a , 2020b ; García Núñez et al., 2019 ; Xue et al., 2017 ; Seol et al., 2015 ; Kim et al., 2018 ). First proposed by Wang Group in 2012 ( Fan et al., 2012 ), the triboelectric nanogenerator (TENG, also called Wang generator), which can convert all kinds of mechanical energy into electricity, has so far been applied in many fields, including the exploitation of ocean wave energy ( Liang et al., 2020a , 2020b , 2020c ), harvesting human motions energy ( Zhao and You, 2014 ; Ren et al., 2020a , 2020b ; Miao et al., 2019 ), and even heartbeat energy ( Ouyang et al., 2019 ; Liu et al., 2019a , 2019b ). Driven by the Maxwell's displacement current, TENGs have significant high-voltage output, which can reach thousands of volts, while the current output of TENGs is very low within the microampere level, and the internal resistance is very large within the megohm level ( Wang et al., 2020a , 2020b , 2020c ; Liu et al., 2019a , 2019b ; Xia et al., 2019 ; Zi et al., 2016a , 2016b ; Li et al., 2020a , 2020b ; Mao et al., 2017 ).…”

Section: Introductionmentioning

confidence: 99%

A universal managing circuit with stabilized voltage for maintaining safe operation of self-powered electronics system

et al. 2021

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Summary Harvesting mechanical energy via a triboelectric nanogenerator (TENG) is a promising strategy for solving energy problems. However, it is necessary to develop an effective and safe energy managing circuit for preventing high voltage breaking electronic devices. Here, a universal managing circuit is developed to optimize TENG's output performance, which for the first time allows the TENG to safely power various sensor systems with a safe and stable voltage. Based on the circuit, TENG's output can be transformed into a stable voltage with tunable amplitude, while an enhanced short-circuit current of 94 mA with an energy loss lower than 5% is achieved. For demonstrations, three different types of TENGs, respectively, targeting at ocean energy, wind energy, and walking energy have been prepared to reveal the capability of the circuit. This study offers a strategy to greatly enhance the output performance of TENGs to provide useful guidance for constructing self-powered and distributed sensor systems.

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“…More importantly, micro-/nano-structure in the elastomeric electrode is thought to be a key element of sensor devices [21][22][23][24], providing faster response time, and higher sensitivity compared to the unstructured electrode [25,26]. Therefore, structured graphene-based sensors have potential to possess superior performance [27]. Nevertheless, even the efficient fabrication of graphene-based materials on flexible electrode still remains a challenge, where fabricating graphene-composites can be time-consuming and costly and require specialized equipment [28], indicating a higher difficulty level on the architecture design of porous graphenebased electrode structure [29].…”

Section: Introductionmentioning

confidence: 99%

Electron-Induced Perpendicular Graphene Sheets Embedded Porous Carbon Film for Flexible Touch Sensors

et al. 2020

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• An efficient method was proposed to prepare perpendicular graphene nano-sheets in flexible sensor electrode. • The nanostructure in carbon electrode was fabricated to further enhance the sensitivity of sensor device using a simple method. • The capacitance showed high performance within only 50-μm dielectric thickness, and an exciting phenomenon of decreasing in capacitance was analyzed. ABSTRACT Graphene-based materials on wearable electronics and bendable displays have received considerable attention for the mechanical flexibility, superior electrical conductivity, and high surface area, which are proved to be one of the most promising candidates of stretching and wearable sensors. However, polarized electric charges need to overcome the barrier of graphene sheets to cross over flakes to penetrate into the electrode, as the graphene planes are usually parallel to the electrode surface. By introducing electron-induced perpendicular graphene (EIPG) electrodes incorporated with a stretchable dielectric layer, a flexible and stretchable touch sensor with "in-sheet-chargestransportation" is developed to lower the resistance of carrier movement. The electrode was fabricated with porous nanostructured architecture design to enable wider variety of dielectric constants of only 50-μm-thick Ecoflex layer, leading to fast response time of only 66 ms, as well as high sensitivities of 0.13 kPa −1 below 0.1 kPa and 4.41 MPa −1 above 10 kPa, respectively. Moreover, the capacitance-decrease phenomenon of capacitive sensor is explored to exhibit an object recognition function in one pixel without any other integrated sensor. This not only suggests promising applications of the EIPG electrode in flexible touch sensors but also provides a strategy for internet of things security functions.

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Skin-Inspired Humidity and Pressure Sensor with a Wrinkle-on-Sponge Structure

Cited by 96 publications

References 44 publications

Recent Progress in Flexible Pressure Sensors Based Electronic Skin

Recent Progress in Flexible Pressure Sensors Based Electronic Skin

A universal managing circuit with stabilized voltage for maintaining safe operation of self-powered electronics system

Electron-Induced Perpendicular Graphene Sheets Embedded Porous Carbon Film for Flexible Touch Sensors

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