Wearable, stable, highly sensitive hydrogel–graphene strain sensors

Lv, Jian; Kong, Chuncai; Yang, Chao; Yin, Lu; Jeerapan, Itthipon; Pu, Fangzhao; Zhang, Xiaojing; Yang, Sen; Yang, Zhimao

doi:10.3762/bjnano.10.47

Cited by 40 publications

(25 citation statements)

References 18 publications

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“…It is an excellent carbon-based conductive filler with high carrier mobility and large surface area. Lv and co-worker reported a new strategy to fabricate strain sensor based on graphene nanomaterial [ 65 ]. They coated graphene on the surface of hydrogel to form a continuous graphene film instead of mixing graphene with hydrogel pre-solution to form gel.…”

Section: Conducting Nanomaterialsmentioning

confidence: 99%

A Review of Conductive Hydrogel Used in Flexible Strain Sensor

Tang

et al. 2020

Materials

128

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Hydrogels, as classic soft materials, are important materials for tissue engineering and biosensing with unique properties, such as good biocompatibility, high stretchability, strong adhesion, excellent self-healing, and self-recovery. Conductive hydrogels possess the additional property of conductivity, which endows them with advanced applications in actuating devices, biomedicine, and sensing. In this review, we provide an overview of the recent development of conductive hydrogels in the field of strain sensors, with particular focus on the types of conductive fillers, including ionic conductors, conducting nanomaterials, and conductive polymers. The synthetic methods of such conductive hydrogel materials and their physical and chemical properties are highlighted. At last, challenges and future perspectives of conductive hydrogels applied in flexible strain sensors are discussed.

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Section: Conducting Nanomaterialsmentioning

confidence: 99%

A Review of Conductive Hydrogel Used in Flexible Strain Sensor

Tang

et al. 2020

Materials

128

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“…In this context conductive polymer hydrogels (CPHs) based on PANI, [330] PPy, [331] PEDOT, [332] CNT, [333] and graphene, [334] offer the possibility to manipulate their 3D morphology and to tune the matrix porosity in order to enhance both flexibility and stretchability which are benchmark parameters for strain sensors. [330][331][332][333] Indeed, Shao et al fabricated a composite conductive hydrogel based on poly(vinyl alcohol)/phytic acid/aminopolyhedral oligomeric silsesquioxane (PVA/PA/NH 2 -POSS) where PA acts as a cross-linking agent conferring ionic conductivity to the scaffold, while NH 2 -POSS acts as a cross-linking creating a 3D porous network.…”

Section: Bioelectronic Platforms For Epidermal Sensing: the Overtaking Of Organic Materialsmentioning

confidence: 99%

Conductive Polymer‐Based Bioelectronic Platforms toward Sustainable and Biointegrated Devices: A Journey from Skin to Brain across Human Body Interfaces

Bettucci

Matrone

Santoro

2021

Adv Materials Technologies

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the human's body toward medical applications. [1] Coupling electronics with human tissues allows sensing, stimulating and possibly regulating biological functions. On these premises, a key paradigm of bioelectronics is to preserve the functionality of the biological environment upon coupling, in order to "observe biology through non-perturbing lenses". However, aiming to a seamless interface, the properties of common electronic components, based on metals or inorganic semiconductors, have major limitations to comply with the coupling requirements for cells, organs, and tissues. [2] In fact, inorganic materials might display mechanical rigidity (high Young's modulus ≈100 GPa), [3,4] surface degradation phenomena (oxidation) [5] and surface structure which increases interface capacitance. [6,7] Organic materials have so emerged combining mechanical flexibility, compatibility with large area and different surface functionalization processes, while keeping high electrical conductivity and reproducibility. [8,9] Particularly, these materials intrinsically display key properties such as tunable surface roughness, [10] surface chemical reactivity 11 , and Young's moduli ranging from 20 kPa to 3 GPa, [11,12] approaching the modulus of living tissue (10 kPa [13] ). However, the diversity of biological landscapes offered by the different human tissues, in terms of mechanical flexibility, interface functionalization, accessibility and biological activities defines sets of requirements so stringent that commonly for each tissue/organ coupling ad hoc devices and platforms have been developed. Hence, examining the three major human's body interfaces targeted by bioelectronics applications (skin, heart, and brain), this review focuses on the strategies that can be adopted by employing organic materials such as surface patterning, novel material synthesis and bio-functionalization in order to enhance tissue/organ-specific coupling performances. These aspects are investigated highlighting current and future main challenges and providing perspectives on the development of the next generation organic bioelectronics devices, thus envisioning systems that are: 1) able to adapt their interface in shape and size to comply with different curvilinear and hierarchical biological architectures and 2) combine sensing and stimulation to dynamically control biological functions for biomedical applications.

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“…There is a continuously growing interest for wearable electronic devices, particularly, devices for fitness and health monitoring applications such as motion monitoring, [1] physicochemical signal sensing, [2,3] and wound healing. [4] The surging development of wearable devices demands the development of efficient reliable and conformal power sources that can be easily integrated onto the human body.…”

Section: Introductionmentioning

confidence: 99%

Stretchable and Flexible Buckypaper‐Based Lactate Biofuel Cell for Wearable Electronics

Chen

Yin

et al. 2019

Adv Funct Materials

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139

148

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This work demonstrates a stretchable and flexible lactate/O 2 biofuel cell (BFC) using buckypaper (BP) composed of multi-walled carbon nanotubes (MWCNTs) as the electrode material. Free-standing BP, functionalized with a pyrene-polynorbornene homopolymer, is fabricated as the immobilization matrix for lactate oxidase (LOx) at the anode and bilirubin oxidase (BOx) at the cathode. This biofuel cell delivers an open circuit voltage of 0.74 V and a high-power density of 520 µW cm-2. The functionalized BP electrodes are assembled onto a stretchable screen-printed current collector with an "island-bridge" configuration, which ensures conformal contact between the wearable BFC and the This article is protected by copyright. All rights reserved. 2 human body and endows the BFC with excellent performance stability under stretching condition. When applied to the arm of the volunteer, the BFC can generate a maximum power of 450 µW. When connected with a voltage booster, the on-body BFC is able to power a light emitting diode under both pulse discharge and continuous discharge modes during exercise. This demonstrates the promising potential of the flexible BP-based BFC as a self-sustained power source for next generation wearable electronics. Received: ((will be filled in by the editorial staff)) Revised: ((will be filled in by the editorial staff))

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Wearable, stable, highly sensitive hydrogel–graphene strain sensors

Cited by 40 publications

References 18 publications

A Review of Conductive Hydrogel Used in Flexible Strain Sensor

A Review of Conductive Hydrogel Used in Flexible Strain Sensor

Conductive Polymer‐Based Bioelectronic Platforms toward Sustainable and Biointegrated Devices: A Journey from Skin to Brain across Human Body Interfaces

Stretchable and Flexible Buckypaper‐Based Lactate Biofuel Cell for Wearable Electronics

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