Thermoresponsive PEDOT:PSS/PNIPAM conductive hydrogels as wearable resistive sensors for breathing pattern detection

Jia, Mengwei; Zhang, Jie

doi:10.1038/s41428-022-00626-y

Cited by 17 publications

(22 citation statements)

References 55 publications

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“…We compared the electrical switch of the conductive hydrogels to the previous studies [Table 2]. 17,27,45,56–62 Ag–PNIPAM 2 also exhibited an electrical conductivity switch stretching 4.4 orders of magnitude. The volume switch of the Ag–PNIPAM sample can be seen in Fig.…”

Section: Resultsmentioning

confidence: 95%

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Highly conductive thermoresponsive silver nanowire PNIPAM nanocomposite for reversible electrical switch

Curry¹,

Lim²,

Fontaine³

et al. 2022

Soft Matter

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Section: Resultsmentioning

confidence: 95%

“…The constant electrical and electrochemical performance gap between expanded and deswelled states can open numerous design opportunities for temperature or mechanical sensors required for the thermo-responsive electrical switch, as suggested in previous studies. 62,[65][66][67]…”

Section: Resultsmentioning

confidence: 99%

Highly conductive thermoresponsive silver nanowire PNIPAM nanocomposite for reversible electrical switch

Curry¹,

Lim²,

Fontaine³

et al. 2022

Soft Matter

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show abstract

“…In addition, most reported electronically conductive hydrogels are opaque, mainly due to the inherent color of the conductive filler, and transparency is critical for visually interactive wearable products. [14] Moreover, electronically conductive hydrogels are costly and time-consuming to prepare, as additional synthesis of conductive fillers is often required. [15] In contrast to electronically conductive hydrogels, ionic conductive hydrogels exhibit tissue-like behavior as a biological system mimic consisting of water, hydrogel polymers, and inorganic salts.…”

Section: Introductionmentioning

confidence: 99%

“…Thus electronically conductive hydrogel‐based strain sensors show high sensitivity at small strains, but cannot be effective at large strains. In addition, most reported electronically conductive hydrogels are opaque, mainly due to the inherent color of the conductive filler, and transparency is critical for visually interactive wearable products [14] . Moreover, electronically conductive hydrogels are costly and time‐consuming to prepare, as additional synthesis of conductive fillers is often required [15] .…”

Section: Introductionmentioning

confidence: 99%

High Electrical Conductivity and Low Temperature Resistant Double Network Hydrogel Ionic Conductor as a Flexible Sensor and Quasi‐Solid Electrolyte

Maimaitiyiming

2022

ChemistrySelect

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The existence of large amounts of water in hydrogel electrolytes makes them inevitably freeze at low temperatures, which causes them to lose properties such as flexibility or electrical conductivity. It limits the application of hydrogel electrolytes at low temperatures. Here, we designed hydrogels with interpenetrating double network structure based on polyacrylamide and agar. By doping a high concentration of LiCl as the conducting material, a continuous ion-conducting path was formed. The conductivity reached 2.18 S/m at 25 °C and 1.58 S/ m at À 30 °C. The prepared hydrogel electrolytes exhibit good mechanical and electrochemical properties to meet the needs of different application situations. A wearable sensor with hydrogel electrolytes was demonstrated. The wearable sensor can be attached to a part of the human body and can successfully detect various human movements. The wearable sensors can be used as temperature sensors in addition to detecting motion, which shows an encouraging and powerful utility in wearable electronic devices.

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“…We note that the approach we developed in this work could presumably be applicable to different stimuli-responsive materials and plant tissues. For example, conductive thermoresponsive 33 and magnetic 34 hydrogels by modifying the PNIPAM composition can serve as good candidates. Plant tissues such as mint or Arabidopsis leaves might be a suitable choice because they possess similar characteristics with spinach leaves, such as being relatively flat and soft and having smooth (i.e., less hairy) surfaces.…”

mentioning

confidence: 99%

Toward Plant Cyborgs: Hydrogels Incorporated onto Plant Tissues Enable Programmable Shape Control

Zhao

Steinmetz

et al. 2022

ACS Macro Lett.

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Engineered living materials (ELMs) that incorporate living organisms and synthetic materials enable advanced functional properties. Here, we seek to create plant cyborgs by combining plants or plant tissues with stimuli-responsive polymeric materials. Plant tissues with integrated shape control may find applications in regenerative medicine, and the shape control of living plants enables another dimension of adaptability and response to environmental threats, which can be applied to next-generation precision farming. In this work, we develop chemistry to integrate stimuli-responsive poly(N-isopropylacrylamide) (PNIPAM) hydrogels with decellularized plant tissues assisted by 3D printing. We demonstrate programmable shape morphing in response to thermal cues and ultraviolet (UV) light. Specifically, by taking advantage of the extrusion-based 3D printing method, we deposit nanocomposite PNIPAM precursors onto silane-treated decellularized leaf surface with prescribed shapes and spatial control. When subjected to external stimuli, the strain mismatch generated between the swellable nanocomposite PNIPAM and nonswellable decellularized leaf enables folding and bending to occur. This strategy to integrate the plant tissues with stimuli-responsive hydrogels allows the control of leaf morphology, opening avenues for plant-based biosensors and soft actuators to enhance food security; such materials also may find applications in biomedicine as tissue-engineering scaffolds.

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Thermoresponsive PEDOT:PSS/PNIPAM conductive hydrogels as wearable resistive sensors for breathing pattern detection

Cited by 17 publications

References 55 publications

Highly conductive thermoresponsive silver nanowire PNIPAM nanocomposite for reversible electrical switch

Highly conductive thermoresponsive silver nanowire PNIPAM nanocomposite for reversible electrical switch

High Electrical Conductivity and Low Temperature Resistant Double Network Hydrogel Ionic Conductor as a Flexible Sensor and Quasi‐Solid Electrolyte

Toward Plant Cyborgs: Hydrogels Incorporated onto Plant Tissues Enable Programmable Shape Control

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