A Self‐Healing Electronic Sensor Based on Thermal‐Sensitive Fluids

He, Yonglin; Liao, Shenglong; Jia, Hanyu; Cao, Yuanyuan; Wang, Zhenning; Wang, Yapei

doi:10.1002/adma.201501436

Cited by 170 publications

(148 citation statements)

References 32 publications

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“…The temperature-sensing mechanism of the tascPLA-OFETs was significantly provided by utilizing the polar-group-induced di electric/ semiconductor interfacial charge-trapping effect, which is enhanced under applied elevated temperature. In addition, He REVIEW et al [ 89 ] reported a self-healing thermal sensor by incorporating thermally sensitive ionic liquids into a self-healing polymer. The repeatability and sensitivity of the fabricated devices were nearly the same after breaking and self-healing.…”

Section: Reviewmentioning

confidence: 99%

Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

2016

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Flexible and stretchable physical sensors that can measure and quantify electrical signals generated by human activities are attracting a great deal of attention as they have unique characteristics, such as ultrathinness, low modulus, light weight, high flexibility, and stretchability. These flexible and stretchable physical sensors conformally attached on the surface of organs or skin can provide a new opportunity for human-activity monitoring and personal healthcare. Consequently, in recent years there has been considerable research effort devoted to the development of flexible and stretchable physical sensors to fulfill the requirements of future technology, and much progress has been achieved. Here, the most recent developments of flexible and stretchable physical sensors are described, including temperature, pressure, and strain sensors, and flexible and stretchable sensor-integrated platforms. The latest successful examples of flexible and stretchable physical sensors for the detection of temperature, pressure, and strain, as well as their novel structures, technological innovations, and challenges, are reviewed first. In the next section, recent progress regarding sensor-integrated wearable platforms is overviewed in detail. Some of the latest achievements regarding self-powered sensor-integrated wearable platform technologies are also reviewed. Further research direction and challenges are also proposed to develop a fully sensor-integrated wearable platform for monitoring human activity and personal healthcare in the near future.

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Section: Reviewmentioning

confidence: 99%

Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

2016

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“…Ionic liquids could not only serve as thermoelectric materials, but also possess advantages including flexible and self-healing properties. [11,32] Therefore, flexible and self-healing thermoelectric converter could be readily obtained with the desirable management Figure 3a. The flexible ILTE converter was placed as three typical patterns, including straight line, ring, and knot, to investigate the bending influence on thermoelectric performance under alternate heating and cooling asymmetrically.…”

Section: Doi: 101002/aelm201600136mentioning

confidence: 99%

“…Amide-based self-healing polymer was synthesized following with the previous procedure. [32] A self-healing ILTE converter was fabricated with the combination of thermoelectric ionic liquid and self-healing polymer ( Figure 3b). As an important premise, electrically self-healing should be firstly taken into consideration in designing selfhealing ILTE converter.…”

Section: Doi: 101002/aelm201600136mentioning

confidence: 99%

Flexible and Self‐Healing Thermoelectric Converters Based on Thermosensitive Liquids at Low Temperature Gradient

Jia

Tao

Wang

2016

Adv Elect Materials

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electrode surface. The mechanism of thermal harvesting is similar with thermal charge of ionic solution, which is confirmed by previous researches on non-redox ionic thermally capacitive cells. [26,27] It is of importance that Seebeck coefficient (S), power factor (PF), and thermoelectric figure of merit (ZT) are three important parameters used to evaluate the thermoelectric performance of potential thermoelectric materials. To maximize the thermoelectric performance, lower thermal conductivity ( ) κ , higher electrical conductivity (σ), and S are needed according to Equation (1)Herein, we designed a flexible and self-healing thermoelectric converter based on thermosensitive liquids with low temperature gradient. Ionic liquid acting as a thermosensitive fluid was employed owing to their intrinsic merits of liquid materials. The converter generates thermoelectric potential variation of tens of millivolt under low temperature gradient on account of asymmetrically heating. Notably, ionic liquids could also be integrated with flexible substrates or functional nanoparticles to render thermoelectric converter possessing the performance of flexibility, self-healing property, and photo-thermo-electric (PTE) conversion.Four imidazolium cations with different alkyl side chain and two anions including inorganic and organic species were combined to investigate thermoelectric performances of seven ionic liquids, excluding 1-ethyl-3-methyl imidazolium hexafluorophosphate ([EMIm][PF 6 ]) behaving as solid at room temperature. A measurement setup for monitoring the realtime change of open-circuit potential of ionic liquid thermoelectric converter (ILTE converter) was constructed to evaluate the S as shown in Figure 1a,b. The ILTE converter placed on two Peltier devices was heated at left end and kept the other end unheated at room temperature (25 °C). Temperature gradient between two ends of ILTE converter was well maintained owing to poor thermal conductivity of ionic liquid, confirmed by the measured thermal conductivity and thermal imaging of infrared camera (Table 1, Figure S8 and Movie S1, Supporting Information). Typical ILTE converter filled with [EMIm][Tf 2 N] was tested for potential variation generated from alternate heating and cooling of Peltier device (Figure 1c). The potential of left electrode immediately decreases when heated left end of converter. Clearly, this phenomenon results from the different ionic mobility, and cation-anion, ion-metal interactions. With unchanged ionic arrangement on right unheated electrode, ionic rearrangement, and migration on heated end lead to the change of open-circuit potential. The potential variation of converter as the value of 42.2 mV shows the approximately same value under fixed temperature gradient of 26.3 K for six cycles, Concerns of urgent global issues on energy crisis and sustainable development have pushed researchers to find new energy sources and novel strategies to utilize the waste energy in the ambient surroundings. Thermoelectric materials are a kind of promising...

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“…[1][2][3][4][5][6] Materials decorated with self-healing feature could boost the lifetime of products and build new potentials in various areas. 7 Selfhealing conductors are currently attracting a significant number of studies, [8][9][10][11][12][13][14][15][16] particularly for advanced electronic applications, including chemical sensors, 17 thermal sensors, 18 supercapacitors, [19][20][21] lithium-ion batteries, 2 and electronic skin. 7,22 Similarly, flexible conductors play an important role in the emerging fields, such as prosthetics, soft robotics, stretchable displays and human machine interfaces.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Multiwalled Carbon Nanotube-Reinforced Polyborosiloxane Nanocomposites with Mechanically Adaptive and Self-Healing Capabilities for Flexible Conductors

Chen

2016

ACS Appl. Mater. Interfaces

108

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Intrinsic self-healing polyborosiloxane (PBS) and its multi-walled carbon nanotube (MWCNT)-reinforced nanocomposites were synthesized from hydroxyl terminated poly(dimethylsiloxane) (PDMS) and boric acid at room temperature. The formation of Si-O-B moiety in PBS was confirmed by Fourier transform infrared spectroscopy. PBS and its MWCNT-reinforced nanocomposites were found possessing water or methanol activated mechanically adaptive behaviors; the compressive modulus decreased substantially when exposed to water or methanol vapor and recovered their high value after the stimulus was removed. The compressive modulus was reduced by 76%, 86%, 90% and 83% for neat PBS and its nanocomposites containing 3.0 wt.%, 6.2 wt.% and 13.3 wt.% MWCNTs, respectively, in water vapor, and the modulus reduction activated by methanol vapor was greater than by water vapor. MWCNTs at higher contents acted as a continuous electrical channel in PBS offering electrical conductivity, which was up to 1.21 S/cm for the nanocomposite containing 13.3 wt.% MWCNTs. The MWCNT-reinforced PBS nanocomposites also showed excellent mechanically and electrically self-healing properties, moldability and adhesion to PDMS elastomer substrate. These properties enabled a straightforward fabrication of self-repairing MWCNT/PBS electronic circuits on PDMS elastomer substrates.

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A Self‐Healing Electronic Sensor Based on Thermal‐Sensitive Fluids

Cited by 170 publications

References 32 publications

Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

Flexible and Self‐Healing Thermoelectric Converters Based on Thermosensitive Liquids at Low Temperature Gradient

Synthesis of Multiwalled Carbon Nanotube-Reinforced Polyborosiloxane Nanocomposites with Mechanically Adaptive and Self-Healing Capabilities for Flexible Conductors

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