Ultrathin hierarchical hydrogel–carbon nanocomposite for highly stretchable fast-response water-proof wearable humidity sensors

Pan, Bingqi; Su, Peipei; Jin, Minghui; Huang, Xiaocheng; Wang, Zhenbo; Zhang, Ruhao; Xu, He; Liu, Wenna; Ye, Yumin

doi:10.1039/d3mh01093g

Cited by 7 publications

(2 citation statements)

References 67 publications

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“…4 Conductive hydrogels have excellent electrical conductivity, adjustable mechanical properties, and good biocompatibility. 5,6 Currently, it can be assembled as a flexible sensor to detect temperature, 7 humidity, 8 and pH. 9 Besides, it can also be used in actuators, 10,11 supercapacitors, 12 triboelectric nanogenerators, 13 etc.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, flexible strain sensors have attracted much attention from researchers in health monitoring due to their lightweight and flexibility. − Conductive hydrogels, an emerging sensing material for flexible strain sensors, are soft materials similar to biological tissues, in which cross-linked polymers with a three-dimensional (3D) network structure are filled with water molecules to form a sponge-like structure . Conductive hydrogels have excellent electrical conductivity, adjustable mechanical properties, and good biocompatibility. , Currently, it can be assembled as a flexible sensor to detect temperature, humidity, and pH . Besides, it can also be used in actuators, , supercapacitors, triboelectric nanogenerators, etc.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of a PNIPAM-Based Composite Hydrogel and Its Multipurpose Applications in Piezoresistive and Temperature Sensing

Yue,

Zhai,

Zhang

et al. 2024

ACS Appl. Electron. Mater.

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Herein, a poly(N-isopropylacrylamide)-based conductive composite hydrogel system coenhanced by clay and polydopamine-modified MXene was synthesized to achieve strain and temperature sensibility simultaneously. The noncovalently cross-linked network via MXene, clay, and polymer chains endowed the synthesized hydrogel with excellent mechanical properties (tensile strength at a break of 117 kPa and elongation at a break of 1723%). This hydrogel also exhibits strong adhesion and good electrical conductivity (0.13 S/m). Regarding the sensing properties, its temperature sensitivity is 2.749 °C−1 , while its strain detection limit is as low as 0.05%. Based on the unique characteristics of the prepared hydrogel, the as-assembled sensor can detect stress and temperature simultaneously, exhibiting great application potential in human physiological monitoring.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of a PNIPAM-Based Composite Hydrogel and Its Multipurpose Applications in Piezoresistive and Temperature Sensing

Yue,

Zhai,

Zhang

et al. 2024

ACS Appl. Electron. Mater.

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Bionic Diffractive Meta‐Silk Patch for Visually Flexible Wearables

Dong,

Wei,

Zhou

et al. 2024

Laser & Photonics Reviews

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Rapid humidity response contributes tremendously to visually flexible wearables. However, sluggish response, infrequent reproducibility, and biotoxicity restrict the development of wearable humidity response devices. Here, inspired by the changes in the color of Dynastes hercules, a flexible wearable, rapid response, stretchable, rewritable meta‐silk fibroin diffractive film (mSFD) is presented. The film is generated by spin‐coating silk protein and polyurethane (PU) cross‐linking, followed by hot pressing of meta‐structures. Owing to the diffraction and stable combination of the SF β‐structure and PU hydrogen bond, mSFDs exhibit excellent coloration, rapid response, and erasability. Notably, the microcolumns and microporous structures on the meta‐membrane endow the membrane with unparalleled rapid response features. Fast color disappearance and reappearance are observed under high humidity conditions (response time <2 ms, cycle in 1 s). In particular, the rapid humidity responsiveness of mSFP induces a change in the color of the membrane, which enables its application in real‐time biomonitoring (wound management, mask regulation) and anticounterfeiting (medicine storage, fingerprint recognition). These properties endow bioinspired mSFD P with high potential in the field of robotic skin.

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Micropatterned Polymer Nanoarrays with Distinct Superwettability for a Highly Efficient Sweat Collection and Sensing Patch

Jin,

Su,

Huang

et al. 2024

Small

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Wearable sweat sensor offers a promising means for noninvasive real‐time health monitoring, but the efficient collection and accurate analysis of sweat remains challenging. One of the obstacles is to precisely modulate the surface wettability of the microfluidics to achieve efficient sweat collection. Here a facile initiated chemical vapor deposition (iCVD) method is presented to grow and pattern polymer nanocone arrays with distinct superwettability on polydimethylsiloxane microfluidics, which facilitate highly efficient sweat transportation and collection. The nanoarray is synthesized by manipulating monomer supersaturation during iCVD to induce controlled nucleation and preferential vertical growth of fluorinated polymer. Subsequent selective vapor deposition of a conformal hydrogel nanolayer results in superhydrophilic nanoarray floor and walls within the microchannel that provide a large capillary force and a superhydrophobic ceiling that drastically reduces flow friction, enabling rapid sweat transport along varied flow directions. A carbon/hydrogel/enzyme nanocomposite electrode is then fabricated by sequential deposition of highly porous carbon nanoparticles and hydrogel nanocoating to achieve sensitive and stable sweat detection. Further encapsulation of the assembled sweatsensing patch with superhydrophobic nanoarray imparts self‐cleaning and water‐proof capability. Finally, the sweat sensing patch demonstrates selective and sensitive glucose and lactate detection during the on‐body test.

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Ultrathin hierarchical hydrogel–carbon nanocomposite for highly stretchable fast-response water-proof wearable humidity sensors

Abstract: A highly stretchable humidity sensor was made from ultrathin hydrogel–carbon nanocomposite with a hierarchical surface architecture, which enables sensor fast response/recovery, good durability, and real-time respiration and skin humidity monitoring.

Cited by 7 publications

References 67 publications

Synthesis of a PNIPAM-Based Composite Hydrogel and Its Multipurpose Applications in Piezoresistive and Temperature Sensing

Synthesis of a PNIPAM-Based Composite Hydrogel and Its Multipurpose Applications in Piezoresistive and Temperature Sensing

Bionic Diffractive Meta‐Silk Patch for Visually Flexible Wearables

Micropatterned Polymer Nanoarrays with Distinct Superwettability for a Highly Efficient Sweat Collection and Sensing Patch

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