Wearable Temperature Sensors with Enhanced Sensitivity by Engineering Microcrack Morphology in PEDOT:PSS–PDMS Sensors

Yu, Yuyan; Peng, Shuhua; Blanloeuil, Philippe; Wu, Shuying; Wang, Chun H.

doi:10.1021/acsami.0c07649

Cited by 109 publications

(99 citation statements)

References 62 publications

(90 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In recent years, to improve temperature sensing performance, various design strategies have been developed by changing the structure. Yu et al [ 176 ] recently proposed a method based on engineering microcrack morphology to change the crack morphology of the PEDOT: PSS film on the PDMS substrate by adjusting the substrate surface roughness, acid treatment time, and pre-stretching degree to improve the temperature sensitivity of the sensor. Figure 9 d shows the effect of average crack length and cracks density on temperature sensitivity.…”

Section: Resultsmentioning

confidence: 99%

“…c The temperature measurement results before and after exercise, the illustration shows the flexible temperature sensor attached to the back of the hand. d Heatmap as functions of average crack length and crack density for TCR valuses from all developed sensors [176]. e PTC and NTC characteristics of the m-LRS processed Ni electrode and Ni-NiO-Ni structure.…”

Section: Sensitivitymentioning

confidence: 99%

See 1 more Smart Citation

Printable, Highly Sensitive Flexible Temperature Sensors for Human Body Temperature Monitoring: A Review

Chen

et al. 2020

Nanoscale Res Lett

145

View full text Add to dashboard Cite

In recent years, the development and research of flexible sensors have gradually deepened, and the performance of wearable, flexible devices for monitoring body temperature has also improved. For the human body, body temperature changes reflect much information about human health, and abnormal body temperature changes usually indicate poor health. Although body temperature is independent of the environment, the body surface temperature is easily affected by the surrounding environment, bringing challenges to body temperature monitoring equipment. To achieve real-time and sensitive detection of various parts temperature of the human body, researchers have developed many different types of high-sensitivity flexible temperature sensors, perfecting the function of electronic skin, and also proposed many practical applications. This article reviews the current research status of highly sensitive patterned flexible temperature sensors used to monitor body temperature changes. First, commonly used substrates and active materials for flexible temperature sensors have been summarized. Second, patterned fabricating methods and processes of flexible temperature sensors are introduced. Then, flexible temperature sensing performance are comprehensively discussed, including temperature measurement range, sensitivity, response time, temperature resolution. Finally, the application of flexible temperature sensors based on highly delicate patterning are demonstrated, and the future challenges of flexible temperature sensors have prospected.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Sensitivitymentioning

confidence: 99%

Printable, Highly Sensitive Flexible Temperature Sensors for Human Body Temperature Monitoring: A Review

Chen

et al. 2020

Nanoscale Res Lett

145

View full text Add to dashboard Cite

show abstract

“…[ 10,11 ] Crack‐assisted fabrication is associated with relatively facile and low‐cost procedures as compared with conventional lithography strategies and has been proposed for a variety of functional applications, including flexible electronics, [ 12–14 ] micro‐ and nanofluidics, [ 15,16 ] optical devices, [ 17,18 ] and sensors. [ 19–23 ]…”

Section: Introductionmentioning

confidence: 99%

“…[10,11] Crack-assisted fabrication is associated with relatively facile and low-cost procedures as compared with conventional lithography strategies and has been proposed for a variety of functional applications, including flexible electronics, [12][13][14] micro-and nanofluidics, [15,16] optical devices, [17,18] and sensors. [19][20][21][22][23] The method used to induce cracking dictates the patterns of cracks that can be obtained. Relatively simple crack patterns are readily obtained by stretching or bending a brittle film supported on a deformable substrate.…”

mentioning

confidence: 99%

“…Relatively simple crack patterns are readily obtained by stretching or bending a brittle film supported on a deformable substrate. [14,[19][20][21][22][23][24][25] Cracking without externallyapplied stress can result from thermally-induced residual stress in glass [26] or evaporation-driven capillary stress, [18] but control of the crack pattern is somewhat limited to chaotic wavy or grid-like patterns. To enable more complexity in crack patterns, approaches that use residual thin film tensile stress on silicon wafer substrates have been investigated.…”

mentioning

confidence: 99%

See 1 more Smart Citation

From Chaos to Control: Programmable Crack Patterning with Molecular Order in Polymer Substrates

et al. 2021

View full text Add to dashboard Cite

The cost, form, and performance of the device are limited by the conditions necessary for these processing techniques. For example, conventional photolithography typically requires patterned light to generate user-defined microscale patterns. [3][4][5] More sophisticated techniques such as electron-beam lithography or dip-pen lithography can pattern nanoscale features, but these multistep scanning processes are highcost and labor-intensive. [6,7] Thus, fabrication techniques that can produce highly organized patterns or structures at small size scales with a simple process may offer significant advantages.In synthetic systems, cracking is normally an unwelcomed, uncontrollable, and chaotic phenomenon caused by mechanical conditions that induce material failure. However, living systems, such as the skin of crocodiles and elephants, often show examples of self-organized crack patterns caused by intrinsic anisotropy. [8,9] Inspired by nature, recent advances in crack-assisted fabrication techniques, also referred to as cracklithography, have demonstrated how the humble crack can be Cracks are typically associated with the failure of materials. However, cracks can also be used to create periodic patterns on the surfaces of materials, as observed in the skin of crocodiles and elephants. In synthetic materials, surface patterns are critical to micro-and nanoscale fabrication processes. Here, a strategy is presented that enables freely programmable patterns of cracks on the surface of a polymer and then uses these cracks to pattern other materials. Cracks form during deposition of a thin film metal on a liquid crystal polymer network (LCN) and follow the spatially patterned molecular order of the polymer. These patterned sub-micrometer scale cracks have an order parameter of 0.98 ± 0.02 and form readily over centimeter-scale areas on the flexible substrates. The patterning of the LCN enables cracks that turn corners, spiral azimuthally, or radiate from a point. Conductive inks can be filled into these oriented cracks, resulting in flexible, anisotropic, and transparent conductors. This materials-based processing approach to patterning cracks enables unprecedented control of the orientation, length, width, and depth of the cracks without costly lithography methods. This approach promises new architectures of electronics, sensors, fluidics, optics, and other devices with micro-and nanoscale features.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202008434. IntroductionProcesses that allow patterning of materials at the micro-or nanoscale enable many devices, including active electronics,

show abstract

Photonic Vitrimer Elastomer with Self‐Healing, High Toughness, Mechanochromism, and Excellent Durability based on Dynamic Covalent Bond

Niu

Cao

Wang

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Vitrimers, with their unique dynamic covalent bonds, possess attractive self‐healability and mechanical robustness, providing an intriguing opportunity to construct functional soft materials. However, their potential for function recovery, especially optical function, is underexplored. Harnessing the synergistic effect of photonic crystals and vitrimers, a novel photonic vitrimer with light regulating and self‐healing capabilities is presented. The resulting photonic vitrimer exhibits a large tensile strain (>1000%), high toughness (21.2 kJ m−3), bright structural color, and mechanochromism. Notably, the structural color remains constant even after 10 000 stretching/releasing cycles, showing superior mechanical stability, creep‐resistance, and excellent durability. More importantly, the exchange of dynamic covalent bonds imparts the photonic vitrimer with a self‐healing ability (>95% efficiency), enabling the recovery of its optical function. Benefiting from the above merits, the photonic vitrimer has been successfully used as a sensor for human motion detection, which demonstrates visualized interactive sensibility even after self‐repairing. This material design provides a general strategy for optical functionalization of vitrimers. The photonic vitrimer elastomers present great potential as resilient functional soft materials for diverse flexible devices and a novel optical platform for soft robotics, smart wearable devices, and human‐machine interaction.

show abstract

Wearable Temperature Sensors with Enhanced Sensitivity by Engineering Microcrack Morphology in PEDOT:PSS–PDMS Sensors

Cited by 109 publications

References 62 publications

Printable, Highly Sensitive Flexible Temperature Sensors for Human Body Temperature Monitoring: A Review

Printable, Highly Sensitive Flexible Temperature Sensors for Human Body Temperature Monitoring: A Review

From Chaos to Control: Programmable Crack Patterning with Molecular Order in Polymer Substrates

Photonic Vitrimer Elastomer with Self‐Healing, High Toughness, Mechanochromism, and Excellent Durability based on Dynamic Covalent Bond

Contact Info

Product

Resources

About