Ultra-sensitive Pressure sensor based on guided straight mechanical cracks

Choi, Yong Whan; Kang, Daeshik; Pikhitsa, Peter V.; Lee, Taemin; Kim, Sang Moon; Lee, Gunhee; Tahk, Dongha; Choi, Mansoo

doi:10.1038/srep40116

Cited by 90 publications

(98 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As another approach, Ren and co‐workers fabricated microscale crack sensors on micropatterned PDMS substrates for regular and controllable microcrack arrays, resulting in a high gauge factor of 5888 at 2% strain . In addition, Choi and co‐workers developed ultrasensitive crack sensors based on guided straight cracks with a maximum gauge factor of 2 × 10 6 at 10% strain …”

Section: Biosystem‐inspired Smart Skinsmentioning

confidence: 99%

Mimicking Human and Biological Skins for Multifunctional Skin Electronics

Lee

Park

Choe

et al. 2019

Adv Funct Materials

266

220

View full text Add to dashboard Cite

Electronic skin (e-skin) technology is an exciting frontier to drive the next generation of wearable electronics owing to its high level of wearability, enabling high accuracy to harvest information of users and their surroundings. Recently, biomimicry of human and biological skins has become a great inspiration for realizing novel wearable electronic systems with exceptional multifunctionality as well as advanced sensory functions. This review covers and highlights bioinspired e-skins mimicking perceptive features of human and biological skins. In particular, five main components in tactile sensation processes of human skin are individually discussed with recent advances of e-skins that mimic the unique sensing mechanisms of human skin. In addition, diverse functionalities in user-interactive, skinattachable, and ultrasensitive e-skins are introduced with the inspiration from unique architectures and functionalities, such as visual expression of stimuli, reversible adhesion, easy deformability, and camouflage, in biological skins of natural creatures. Furthermore, emerging wearable sensor systems using bioinspired e-skins for body motion tracking, healthcare monitoring, and prosthesis are described. Finally, several challenges that should be considered for the realization of next-generation skin electronics are discussed with recent outcomes for addressing these challenges.

show abstract

Section: Biosystem‐inspired Smart Skinsmentioning

confidence: 99%

Mimicking Human and Biological Skins for Multifunctional Skin Electronics

Lee

Park

Choe

et al. 2019

Adv Funct Materials

266

220

View full text Add to dashboard Cite

show abstract

“…Pressure‐sensitive electronic skins, devised to transform external stimulation on the epidermis to electronic signals by utilizing piezoresistive, piezoelectric, capacitive, and optical sensing technologies, have been studied for various applications in health monitoring, prosthetics, and robotics . Recently, impressive progress has been achieved in creating ultrasensitive and ultrafast responsive sensors . Besides these high‐performance pressure sensors, multifunctional pressure sensors have also been studied for simulating other properties of human skin, such as distinguishing three‐axial force direction, sensing humidity and temperature, and haptic memory .…”

Section: Introductionmentioning

confidence: 99%

Wavelength‐Gradient Graphene Films for Pressure‐Sensitive Sensors

Wang

Qiu

Jia

et al. 2018

Adv Materials Technologies

View full text Add to dashboard Cite

Graphene, because of the prominent mechanical strength, [17] high electric and thermal conductivity, [18] and high carrier mobility, [19][20][21] has received ever-growing interest in creating pressure sensors, [22,23] together with other candidates like carbon nanotubes (CNTs), [24,25] metallic nanowires, [26] and polypyrrole. [27] Wavy graphene structure can form periodic wrinkles and is considered as one type of skin-inspired crumpled structures, which can be fabricated by the pattern-assisted method [28] and the pre-strain method. [29] Wavy graphene materials have been widely applied in diverse applications, for example, capacitors [30] and strain sensors. [31] However, the wavy graphene structure, especially the one with gradient feature, has not attracted enough attention for developing novel pressure sensors.In this work, we prepared wavelength-gradient graphene films to exhibit the gradient feature and other conventional properties of pressure sensors. Due to the gradient structure, the electrical conductivity in the sensors increased when applying equal pressures on different areas where the average wavelength of the wrinkles increased. And the pressure sensor also exhibited a high sensitivity toward external pressure in a wide range (0-5000 Pa), a low limit of detection of 24.5 Pa, and a slow response time of ≈1 s. Accordingly, we further anticipate the novel pressure sensor to find practical applications in detecting the position of equal pressures and in amplifying the difference of electric signal of two similar pressures, due to the pressure-sensitive performance of the unique gradient structure. Figure 5. a) The detection limit of the pressure sensor and its response time. b) Current change of the pressure sensor at different pressure of 49, 122.5, 367.5, and 980 Pa. c) Current change of the pressure sensor under a pressure of 2 kPa at a frequency of 0.025 Hz for 500 cycles, and current change of the pressure sensor restarting after a 30 min pause. www.advancedsciencenews.com

show abstract

“…Where ∆R is the resistance change with deformation, R 0 is the resistance before deformation, and ε is the applied deformation. Moreover, it has diverse advantages including flexibility, wearability, and multifunctional sensing abilities [13][14][15][16][17]. However, the durability of the sensor in harsh environments of liquids and/or high temperature is still a challenging issue.…”

Section: Introductionmentioning

confidence: 99%

Polyimide Encapsulation of Spider-Inspired Crack-Based Sensors for Durability Improvement

Kim

Lee

et al. 2018

Applied Sciences

Self Cite

View full text Add to dashboard Cite

Abstract:In mechanical sensory systems, encapsulation is one of the crucial issues to take care of when it comes to protection of the systems from external damage. Recently, a new type of a mechanical strain sensor inspired by spider's slit organ has been reported, which has incredibly high sensitivity, flexibility, wearability, and multifunctional sensing abilities. In spite of many of these advantages, the sensor is still vulnerable in harsh environments of liquids and/or high temperature, because it has heat-vulnerable polyethylene terephthalate (PET) substrate without any encapsulation layer. Here, we present a mechanical crack-based strain sensor with heat, water and saline solution resistance by alternating the substrate from polyester film to polyimide film and encapsulating the sensor with polyimide. We have demonstrated the ability of the encapsulated crack-based sensor against heat, water, saline solution damage through experiments. Our sensor exhibited reproducibility and durability with high sensitivity to strain (gauge factor above 10,000 at strain of two percent). These results show a new potential of the crack-based sensory system to be used as a wearable voice/motion/pulse sensing device and a high-temperature strain sensor.

show abstract

Ultra-sensitive Pressure sensor based on guided straight mechanical cracks

Cited by 90 publications

References 22 publications

Mimicking Human and Biological Skins for Multifunctional Skin Electronics

Mimicking Human and Biological Skins for Multifunctional Skin Electronics

Wavelength‐Gradient Graphene Films for Pressure‐Sensitive Sensors

Polyimide Encapsulation of Spider-Inspired Crack-Based Sensors for Durability Improvement

Contact Info

Product

Resources

About