Green Solvent‐Processed Hemi‐Isoindigo Polymers for Stable Temperature Sensors

Ngai, Jenner H. L.; Polena, John; Afzal, Daniel; Gao, Xiang; Kapadia, Mihir; Li, Yuning

doi:10.1002/adfm.202110995

Cited by 16 publications

(27 citation statements)

References 102 publications

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“…The obtained TCR 1 and TCR 2 absolute values are 2.22 and 0.26% °C –1 within the range of 25–60 and 60–110 °C, respectively, demonstrating that LFICE-4 has a good thermal-responsive performance and is promising for temperature sensing. Especially, in the relatively low temperature range, the TCR 1 absolute value of LFICE-4 surpasses those of some previously reported solid-state temperature sensors. ,− Moreover, the LFICE-4 is repeatedly attached to the outer wall of the glass bottles filled with ∼30 and ∼70 °C water (Figure S4), and the relative resistance variation of LFICE is recorded to assess the temperature identification capacity. As shown in Figure d, under the alternating temperature of cold (30 °C) and heat (70 °C), the output electrical signal presents a distinguishing feature and negligible deviation, revealing that the temperature sensing performance of LFICE-4 is extremely stable and highly repeatable.…”

Section: Resultsmentioning

confidence: 58%

Liquid-Free Ion-Conducting Elastomer with Environmental Stability for Soft Sensing and Thermoelectric Generating

Zhou

Jin

Zeng

et al. 2022

ACS Appl. Mater. Interfaces

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Ionic conductors are promising candidates for fabricating soft electronics, but currently applied ionic hydrogels and organogels suffer from liquid leakage and evaporation issues. Herein, we fabricated a free-liquid ionic conducting elastomer (LFICE) with dry lithium bis(trifluoromethane sulfonimide) and elastomeric waterborne polyurethane. The resultant versatile LFICE exhibits superior tensile strength (∼4.5 MPa), satisfactory stretchability (>900%), excellent ionic conductivity (8.32 × 10–4 S m–1 at 25 °C), and sensitive strain (3.21) and temperature (2.22% °C–1) response. The LFICE also presents durable environmental stability due to the all-solid-state feature. In the exploration of application prospects, the as-assembled LFICE sensor can precisely and repeatedly detect human motion and temperature changes, demonstrating its potentials in digital medical diagnosis and monitoring; the as-assembled LFICE thermoelectric generator (TEG) shows a high ionic thermovoltage of 4.41 mV K–1, paving a bright path for the advent of self-powered soft electronics. It is believed that this research boosts the facile fabrication of environmental stable stretchable ionic conductors holding great promise in next-generation soft electronics integrated with dual thermo- and strain-response and energy harvesting.

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Section: Resultsmentioning

confidence: 58%

Liquid-Free Ion-Conducting Elastomer with Environmental Stability for Soft Sensing and Thermoelectric Generating

Zhou

Jin

Zeng

et al. 2022

ACS Appl. Mater. Interfaces

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“…The temperature curve of SHCF (red line) even exhibited faster response time and more sensitive variation than thermometer when nearing the hand. Therefore, unlike most sensors with exponential or multi-regions linear characteristics, [43,44] the linear response toward the broad sensing range of SHCF enabled expeditious temperature analysis without complex signal processing.…”

Section: Highly Linear and Strain-insensitive Temperature Perception ...mentioning

confidence: 99%

Ultra‐Stretchable Spiral Hybrid Conductive Fiber with 500%‐Strain Electric Stability and Deformation‐Independent Linear Temperature Response

Sang

Zhang

et al. 2023

Small

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Stretchable configuration occupies priority in devising flexible conductors used in intelligent electronics and implantable sensors. While most conductive configurations cannot suppress electrical variations against extreme deformation and ignore inherent material characteristics. Herein, a spiral hybrid conductive fiber (SHCF) composed of aramid polymeric matrix and silver nanowires (AgNWs) coating is fabricated through shaping and dipping processes. The homochiral coiled configuration mimicked by plant tendrils not only enables its high elongation (958%), but also generates a superior deformation‐insensitive effect to existing stretchable conductors. The resistance of SHCF maintains remarkable stability against extreme strain (500%), impact damage, air exposure (90 days), and cyclic bending (150 000 times). Moreover, the thermal‐induced densification of AgNWs on SHCF achieves precise and linear temperature response toward a broad range (−20 to 100 °C). Its sensitivity further manifests high independence to tensile strain (0%–500%), allowing for flexible temperature monitoring of curved objects. Such unique strain‐tolerant electrical stability and thermosensation hold broad prospects for SHCF in lossless power transferring and expeditious thermal analysis.

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“…Note that the slope values as calculated by formula (1) correspond to temperature coefficient of resistivity (see for example [34]). Unless the NTC effect, for PTC materials' TCR has negative values.…”

Section: Heating Curvesmentioning

confidence: 99%

Polymer Composites with Self-Regulating Temperature Behavior: Properties and Characterization

Setnescu

Lungulescu²,

Marinescu³

2022

Materials

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A novel conductive composite material with homogeneous binary polymer matrix of HDPE (HD) and LLDPE (LLD), mixed with conductive filler consisting of carbon black (CB) and graphite (Gr), was tested against a HDPE composite with a similar conductive filler. Even the concentration of the conductive filler was deliberately lower for (CB + Gr)/(LLD + HD), and the properties of this composite are comparable or better to those of (CB + Gr)/HD. The kinetic parameters of the ρ-T curves and from the DSC curves indicate that the resistivity peak is obtained when the polymer matrix is fully melted. When subjected to repeated thermal cycles, the composite (CB + Gr)/(LLD + HD) presented a better electrical behavior than composite CB + Gr)/HD, with an increase in resistivity (ρmax) values with the number of cycles, as well as less intense NTC (Negative Temperature Coefficient) effects, both for the crosslinked and thermoplastic samples. Radiation crosslinking led to increased ρmax values, as well as to inhibition of NTC effects in both cases, thus having a clear beneficial effect. Limitation effects of surface temperature and current intensity through the sample were observed at different voltages, enabling the use of these materials as self-regulating heating elements at various temperatures below the melting temperature. The procedure based on physical mixing of the components appears more efficient in imparting lower resistivity in solid state and high PTC (Positive Temperature Coefficient) effects to the composites. This effect is probably due to the concentration of the conductive particles at the surface of the polymer domains, which would facilitate the formation of the conductive paths. Further work is still necessary to optimize both the procedure of composite preparation and the properties of such materials.

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Green Solvent‐Processed Hemi‐Isoindigo Polymers for Stable Temperature Sensors

Cited by 16 publications

References 102 publications

Liquid-Free Ion-Conducting Elastomer with Environmental Stability for Soft Sensing and Thermoelectric Generating

Liquid-Free Ion-Conducting Elastomer with Environmental Stability for Soft Sensing and Thermoelectric Generating

Ultra‐Stretchable Spiral Hybrid Conductive Fiber with 500%‐Strain Electric Stability and Deformation‐Independent Linear Temperature Response

Polymer Composites with Self-Regulating Temperature Behavior: Properties and Characterization

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