Stretchable freezing-tolerant triboelectric nanogenerator and strain sensor based on transparent, long-term stable, and highly conductive gelatin-based organohydrogel

Wu, Muying; Wang, Xin; Xia, Yifan; Zhu, Yan; Zhu, Shunli; Jia, Chunyang; Guo, Wei; Li, Qingqing; Yan, Zheng‐Guang

doi:10.1016/j.nanoen.2022.106967

Cited by 130 publications

(80 citation statements)

References 49 publications

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“…(a) Comparison of strain sensitivity among the sensors of this work (highlighted by the dashed ellipse), in both piezoresistive and piezocapacitive modes, and ionically conductive sensors in the literature reported in Table S1. ,,− For devices with no constant sensitivity, their maximum sensitivity is presented through dashed lines. (b) Comparison of temperature sensitivity (temperature coefficient, TC) among the sensors in this work (highlighted by the dashed ellipsis), in both piezoresistive and piezocapacitive modes, and ionically conductive sensors in the literature reported in Table S1. ,− …”

Section: Resultsmentioning

confidence: 99%

Ultrasensitive Piezoresistive and Piezocapacitive Cellulose-Based Ionic Hydrogels for Wearable Multifunctional Sensing

Mogli

Chiappone

Sacco

et al. 2022

ACS Appl. Electron. Mater.

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Tactile sensors, namely, flexible devices that sense physical stimuli, have received much attention in the last few decades due to their applicability in a wide range of fields like the world of wearables, soft robotics, prosthetics, and e-skin. Nevertheless, achieving a trade-off among stretchability, good sensitivity, easy manufacturability, and multisensing ability is still a challenge. Herein, an extremely flexible strain sensor composed of a cellulose-based hydrogel is presented. A natural biocompatible carboxymethylcellulose (CMC) hydrogel endowed with ionic conductivity by sodium chloride (NaCl) was used as the sensitive part. Both the sensible layer and electrodes were investigated with an innovative approach for wearable sensor applications based on electrochemical impedance spectroscopy to find the best device configuration. The sensor, exploitable both as a piezoresistor and as a piezocapacitor, presents high sensitivity to external stimuli, together with an extreme stretchability of up to 600%, showing the best strain and temperature sensitivity among the ionic conductive hydrogel-based devices presented in the literature. The very high strain sensitivity enables the hydrogel to be implemented in wearable strain sensors to monitor different human motions and physiological signals, representing a valid solution for the realization of transparent, easily manufacturable, and low-environmental-impact devices.

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Section: Resultsmentioning

confidence: 99%

Ultrasensitive Piezoresistive and Piezocapacitive Cellulose-Based Ionic Hydrogels for Wearable Multifunctional Sensing

Mogli

Chiappone

Sacco

et al. 2022

ACS Appl. Electron. Mater.

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“…The corresponding relationship between relative resistance and strain is used to determine whether a stretchable conductor can be used as a strain sensor. , As shown in Figure b, the GF value (3.25) of TEOA 0.10 -PTA@LiTFSI was calculated by eq . The comprehensive properties of the liquid-free self-healing elastomeric conductor prepared by us were superior to other high-performance stretchable materials reported recently (Figure c). ,− Moreover, the electrochemical workstation was used to evaluate the sensitivity of TEOA 0.10 -PTA@LiTFSI to monitor human joint flexion.…”

Section: Resultsmentioning

confidence: 99%

Elastomeric Liquid-Free Conductor for Iontronic Devices

Zhang

Chen

et al. 2022

Langmuir

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For a long time, the potential application of gel-based ionic devices was limited by the problem of liquid leakage or evaporation. Here, we utilized amorphous, irreversible and reversible cross-linked polyTA (PTA) as a matrix and lithium bis(trifluoromethane sulfonamide) (LiTFSI) as an electrolyte to prepare a stretchable (495%) and self-healing (94%) solvent-free elastomeric ionic conductor. The liquid-free ionic elastomer can be used as a stable strain sensor to monitor human activities sensitively under extreme temperatures. Moreover, the prepared elastic conductor (TEOA0.10-PTA@LiTFSI) was also considered an electrode to assemble with self-designed repairable dielectric organosilicon layers (RD-PDMS) to develop a sustainable triboelectric nanogenerator (SU-TENG) with outstanding performance. SU-TENG maintained good working ability under extreme conditions (−20 °C, 60 °C, and 200% strain). This work provided a low-cost and simple idea for the development of reliable iontronic equipment for human–computer interaction, motion sensing, and sustainable energy.

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“…90 An alternative to the substitution of conducting polymers is explored through the use of ionic hydrogels applied mutually as an electrification layer and electrode. 91 For applications in which transparency and stretchable-freezing tolerant devices are required, conductive gelatin/NaCl organohydrogels 92 introduce long-term stability in association with freezing resistance and self-healing properties. Alternatively, ionic-liquid-locked ionogel-based samples have been mutually explored as electrode and electrification layers.…”

Section: Triboelectric Nanogeneratorsmentioning

confidence: 99%