All-Graphene-Based Highly Flexible Noncontact Electronic Skin

An, Jianing; Le, Truong‐Son Dinh; Huang, Yi; Zhan, Zhaoyao; Li, Yong; Zheng, Lianxi; Huang, Wei; Sun, Gengzhi; Kim, Young‐Jin

doi:10.1021/acsami.7b13701

Cited by 116 publications

(117 citation statements)

References 45 publications

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“…Flexible circuit has attracted great attentions due to its promising application in flexible electronics such as artificial skins,1 foldable supercapacitors,2 Near‐field communication (NFC) tags 3 and deformable touch‐screen 4. However, traditional flexible circuit that utilized rigid conductive materials (i.e., Cu, Ag, ITO) tends to generate cracks caused by metal fatigue or small bending radius during long‐term use,5,6 leading to deterioration of electrical performance 7.…”

Section: Introductionmentioning

confidence: 99%

A Novel Conductive Core–Shell Particle Based on Liquid Metal for Fabricating Real‐Time Self‐Repairing Flexible Circuits

Zheng

Peng

et al. 2020

Adv Funct Materials

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As a critical part of flexible electronics, flexible circuits inevitably work in a dynamic state, which causes electrical deterioration of brittle conductive materials (i.e., Cu, Ag, ITO). Recently, gallium-based liquid metal particles (LMPs) with electrical stability and self-repairing have been studied to replace brittle materials owing to their low modulus and excellent conductivity. However, LMP-coated Ga 2 O 3 needs to activate by external sintering, which makes it more complicated to fabricate and gives it a larger short-circuit risk. Coreshell structural particles (Ag@LMPs) that exhibit excellent initial conductivity (8.0 Ω sq −1 ) without extra sintering are successfully prepared by coating nanosilver on the surface of LMPs through in situ chemical reduction. The critical stress at which rigid Ag shells rupture can be controlled by adjusting the Ag shell thickness so that LM cores with low moduli can release, achieving real-time self-repairing (within 200 ms) under external destruction. Furthermore, a flexible circuit utilizing Ag@LMPs is fabricated by screen printing, and exhibits outstanding stability and durability (R/R 0 < 1.65 after 10 000 bending cycles in a radius of 0.5 mm) because of the functional core-shell structure. The self-repairable Ag@LMPs prepared in this study are a candidate filler for flexible circuit design through multiple processing methods.

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Section: Introductionmentioning

confidence: 99%

A Novel Conductive Core–Shell Particle Based on Liquid Metal for Fabricating Real‐Time Self‐Repairing Flexible Circuits

Zheng

Peng

et al. 2020

Adv Funct Materials

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“…Our device exhibits extremely fast response time (<0.3 s) and recovery time (<0.5 s) when RH increases from 0 to 40% as shown in Figure d. The response and recovery times were defined as the time spent to reach 90% of the total current change . In addition, the sensor also has fast response (<0.4 s) and recovery (<2 s) over the full RH range (0–100%) (Figure S3, Supporting Information).…”

mentioning

confidence: 98%

“…So far, a variety of sensing materials, such as graphene oxide (GO), carbon nanotubes, 2D materials, and porous membrane have been studied for the use in humidity sensors, but there still exists some limitations in terms of stability and performance. Besides, relatively few sensor arrays for real applications have been developed.…”

mentioning

confidence: 99%

“…Fast response and recovery performance allow the sensor to efficiently differentiate normal and fast breathing. Compared to traditional respiratory monitoring methods and previous literatures, our systems are much simpler, lower cost, and more convenient for daily and at‐home monitoring. Athletes, patients, or others may use this humidity sensor for routine RH changes and respiratory status monitoring to track their health‐related changes.…”

mentioning

confidence: 99%

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Flexible Smart Noncontact Control Systems with Ultrasensitive Humidity Sensors

Yang

Shi

Lou

et al. 2019

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The development of noncontact humidity sensors with high sensitivity, rapid response, and a facile fabrication process is urgently desired for advanced noncontact human–machine interaction (HMI) applications. Here, a flexible and transparent humidity sensor based on MoO3 nanosheets is developed with a low‐cost and easily manufactured process. The designed humidity sensor exhibits ultrahigh sensitivity, fast response, great stability, and high selectivity, exceeding the state‐of‐the‐art humidity sensors. Furthermore, a wearable moisture analysis system is assembled for real‐time monitoring of ambient humidity and human breathing states. Benefiting from the sensitive and rapid response to fingertip humidity, the sensors are successfully applied to both a smart noncontact multistage switch and a novel flexible transparent noncontact screen for smart mobile devices, demonstrating the potential of the MoO3 nanosheets‐based humidity sensors in future HMI systems.

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“…The conductive nanomaterial commonly used include carbon nanotubes [10], graphene [11], metal nanowires [12], and their composites [13]. The conductive nanomaterial filled in the elastic matrix contact each other to form electrical networks that make the free electrons travel easily and conduct the electricity [14][15][16][17][18][19]. These conductive composite materials are lightweight, resistant to corrosion, and can be easily adapted to meet the needs of a specific application.…”

mentioning

confidence: 99%

Properties of Graphene-Thermoplastic Polyurethane Flexible Conductive Film

et al. 2020

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Flexible conductive films were prepared via a convenient blending method with thermoplastic polyurethane (TPU) as matrix and nanocrystalline cellulose (NCC) modified chemically reduced graphene oxide (RGO/NCC) as the conductive fillers. The relationships between the electrical and thermal properties as well as the tensile strength and electrothermal response performance of the composite film and the mass content of reduced graphene oxide (RGO) and the initial TPU concentration were systematically investigated. The experimental results show that the resistivity of the composite film with the mass content of RGO/NCC of 7 wt% and an initial TPU concentration of 20 wt% is the minimum of 8.1 Ω·mm. However, the thermal conductivity of composite film with mass content of RGO/NCC of 5 wt% and the initial TPU concentration of 30 wt% reaches a maximum of 0.3464 W·m−1·K−1, which is an increase of 56% compared with pure TPU. The tensile strength of the composite films with mass contents of RGO of 3 wt% prepared with the initial TPU concentrations of 20 wt% reaches the maximum of 43.2 MPa, which increases by a factor of 1.5 (the tensile strength of the pure TPU is 28.9 MPa). The composite conductive film has a fast electrothermal response. Furthermore, superhydrophobic composite conductive films were prepared by immersing the composite conductive film into fluorinated decyl polyhedral oligomeric silsesquioxane (F-POSS) ethanol solution. The water contact angle of the superhydrophobic composite conductive film reaches 158.19° and the resistivity of the superhydrophobic composite film slightly increases and still has good conductivity.

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All-Graphene-Based Highly Flexible Noncontact Electronic Skin

Cited by 116 publications

References 45 publications

A Novel Conductive Core–Shell Particle Based on Liquid Metal for Fabricating Real‐Time Self‐Repairing Flexible Circuits

A Novel Conductive Core–Shell Particle Based on Liquid Metal for Fabricating Real‐Time Self‐Repairing Flexible Circuits

Flexible Smart Noncontact Control Systems with Ultrasensitive Humidity Sensors

Properties of Graphene-Thermoplastic Polyurethane Flexible Conductive Film

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