Pressure/Temperature Sensing Bimodal Electronic Skin with Stimulus Discriminability and Linear Sensitivity

Bae, Geun Yeol; Han, Joong Tark; Lee, Giwon; Lee, Siyoung; Kim, Sung Won; Park, Sangsik; Kwon, Jung‐Dae; Jung, Sungjune; Cho, Kilwon

doi:10.1002/adma.201803388

Cited by 299 publications

(284 citation statements)

References 45 publications

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“…Among various materials, graphene and its derivatives are wildly applied in temperature sensors owing to its outstanding electrical and thermal properties . However, the sensitivities of bare graphene or its derivatives based temperature sensors are unsatisfactory and generally no more than 1.00% °C −1 . In order to obtain superior sensitivity and flexibility of temperature sensor, graphene and its derivatives were composited with other materials, such as PEDOT:PSS, polyurethane (PU), CNTs, polydimethylsiloxane (PDMS),[8b] and cellulose .…”

Section: Introductionmentioning

confidence: 99%

A High‐Performances Flexible Temperature Sensor Composed of Polyethyleneimine/Reduced Graphene Oxide Bilayer for Real‐Time Monitoring

Liu

Tai

Yuan

et al. 2019

Adv Materials Technologies

118

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sensor with enough sensitivity, accuracy, and durability which can realize real-time and long-term temperature monitoring is strongly desired.To date, some researches on skinattachable temperature sensors were reported, in which different kinds of materials, including metal nanoparticles/ nanowires, [4,5] graphene, [6][7][8][9][10] carbon nanotubes (CNTs), [11][12][13] polymers (such as poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)), [5a,10,12,14] and others, have been explored as temperature sensing materials. Among various materials, graphene and its derivatives are wildly applied in temperature sensors owing to its outstanding electrical and thermal properties. [15] However, the sensitivities of bare graphene or its derivatives based temperature sensors are unsatisfactory and generally no more than 1.00% °C −1 . [6,7,9,16,17] In order to obtain superior sensitivity and flexibility of temperature sensor, graphene and its derivatives were composited with other materials, such as PEDOT:PSS, [10] polyurethane (PU), [18] CNTs, [19] polydimethylsiloxane (PDMS), [8b] and cellulose. [20] According to the studies of graphene composite temperature sensor, the maximum sensitivity can achieve ≈1.34% °C −1 , while the highest accuracy can only reach 0.2 °C, still existing a gap to monitor human skin temperature, and the linearity and durability still remain to be improved for the practical use. [18] Additionally, the fabrication complexity was also largely increased by the composite process.Herein, a skin-attachable flexible temperature sensor with high sensitivity and durability was developed on polyimide (PI) substrate through a facile spray-dipping method. The polyethyleneimine (PEI) and bare reduced graphene oxide (rGO) were used as the adhesive and temperature sensing material, respectively, without any composite involved. The spectroscopy properties of the sensing film were characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-vis), and X-ray photoelectron spectroscopy (XPS) and the morphology was obtained by scanning electron microscope (SEM). The sensor exhibited a high sensitivity of 1.30% °C −1 between 25 and 45 °C, which is closely approximate to the graphene composites temperature sensor. Specially, the sensor can detect the very tiny temperature change of 0.1 °C and showed excellent durability (120 d), satisfying the demands The temperature sensors are urgently required for real-time temperature monitoring in healthcare, disease diagnosis, and other areas. In this work, a skin-attachable flexible temperature sensor composed of polyethyleneimine/ reduced graphene oxide bilayer is developed on polyimide substrate by a facile spray-dipping process. The spectroscopy properties of sensing films are examined and analyzed in details and demonstrated the partial reduction of graphene oxide film. The prepared sensor exhibits high sensitivity (1.30% °C −1 ), linearity (R 2 = 0.999), accuracy (0.1 °C), and durability (60 d) for temperature sensing ...

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Section: Introductionmentioning

confidence: 99%

A High‐Performances Flexible Temperature Sensor Composed of Polyethyleneimine/Reduced Graphene Oxide Bilayer for Real‐Time Monitoring

Liu

Tai

Yuan

et al. 2019

Adv Materials Technologies

118

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“…Several effects (sensing ability, stretchability, fabrication, and sensitivity) are adopted to evaluate the performances of SBSA for hand gesture detection and drivers' status monitoring as shown in Table 1. E-skin with pressure/temperature stimuli exhibited high pressure sensitivity of 0.7 kPa −1 up to 25 kPa and reproducible temperature coefficient of resistance of 0.83% K −1 in the temperature range 22-70 • C [42]. Flexible bimodal sensor using a paper platform and inkjet printing method exhibits a high-pressure sensitivity and high-endurance characteristics.…”

Section: Resultsmentioning

confidence: 96%

Soft Bimodal Sensor Array Based on Conductive Hydrogel for Driving Status Monitoring

Dong

Yao

Yang

2020

Sensors

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Driving status monitoring is important to safety driving which could be adopted to improve driving behaviors through hand gesture detection by wearable electronics. The soft bimodal sensor array (SBSA) composed of strain sensor array based on ionic conductive hydrogels and capacitive pressure sensor array based on ionic hydrogel electrodes is designed to monitor drivers’ hand gesture. SBSA is fabricated and assembled by the stretchable functional and structural materials through a sol–gel process for guaranteeing the overall softness of SBSA. The piezoresistive strain and capacitive pressure sensing abilities of SBSA are evaluated by the data acquisition system and signal analyzer with the external physical stimuli. The gauge factor (GF) of the strain sensor is 1.638 under stretched format, and –0.726 under compressed format; sensitivity of the pressure sensor is 0.267 kPa−1 below 3.45 and 0.0757 kPa−1 in the range of 3.45–12 kPa, which are sensitive enough to hand gesture detection and driving status monitoring. The simple recognition method for the driver’s status behavior is proposed to identify the driver’s behaviors with the piezoresistive properties of conductive polymers, and the turning angles are computed by the strain and pressure values from SBSA. This work demonstrates an effective approach to integrate SBSA seamlessly into an existing driving environment for driving status monitoring, expanding the applications of SBSA in wearable electronics.

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“…Practical applications put forward higher demands for skin‐inspired physical sensors, such as higher sensitivity, lower detection limit, wider working range, and faster response speed. In addition to the traditional performance demands, physical sensors with novel properties, such as versatility, self‐healability, implantability, recyclability, and absorbability, are receiving more and more attention.…”

Section: Novel Properties Of Skin‐inspired Physical Sensorsmentioning

confidence: 99%

Physical sensors for skin‐inspired electronics

Zhang

Wang

et al. 2019

InfoMat

185

143

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Skin, the largest organ in the human body, is sensitive to external stimuli.In recent years, an increasing number of skin-inspired electronics, including wearable electronics, implantable electronics, and electronic skin, have been developed because of their broad applications in healthcare and robotics.Physical sensors are one of the key building blocks of skin-inspired electronics. Typical physical sensors include mechanical sensors, temperature sensors, humidity sensors, electrophysiological sensors, and so on. In this review, we systematically review the latest advances of skin-inspired mechanical sensors, temperature sensors, and humidity sensors. The working mechanisms, key materials, device structures, and performance of various physical sensors are summarized and discussed in detail. Their applications in health monitoring, human disease diagnosis and treatment, and intelligent robots are reviewed. In addition, several novel properties of skin-inspired physical sensors such as versatility, self-healability, and implantability are introduced. Finally, the existing challenges and future perspectives of physical sensors for practical applications are discussed and proposed. K E Y W O R D Selectronics skin, flexible electronics, humidity sensors, mechanical sensors, temperature sensors, wearable sensors

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Pressure/Temperature Sensing Bimodal Electronic Skin with Stimulus Discriminability and Linear Sensitivity

Cited by 299 publications

References 45 publications

A High‐Performances Flexible Temperature Sensor Composed of Polyethyleneimine/Reduced Graphene Oxide Bilayer for Real‐Time Monitoring

A High‐Performances Flexible Temperature Sensor Composed of Polyethyleneimine/Reduced Graphene Oxide Bilayer for Real‐Time Monitoring

Soft Bimodal Sensor Array Based on Conductive Hydrogel for Driving Status Monitoring

Physical sensors for skin‐inspired electronics

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