Self‐Healable and Stretchable Organic Thermoelectric Materials: Electrically Percolated Polymer Nanowires Embedded in Thermoplastic Elastomer Matrix

Jeong, Yong Jin; Jung, Jaemin; Suh, Eui Hyun; Yun, Dong Jin; Oh, Jong Gyu; Jang, Jaeyoung

doi:10.1002/adfm.201905809

Cited by 52 publications

(64 citation statements)

References 62 publications

(115 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 9a shows the experimental setup used to characterize the Seebeck coefficient (S). [44] Following the equation: S = −ΔV/ΔT, the S of as-deposited PEDOT:PSS film is obtained by the extraction of five points of the thermovoltage versus temperature difference plot, as shown in Figure 9b. R 2 is related to the measurement error and R 2 = 1 indicates the highest accuracy of measurement.…”

Section: Resultsmentioning

confidence: 99%

In‐Situ Photoelectron Spectroscopy Study on the Air Degradation of PEDOT:PSS in Terms of Electrical and Thermoelectric Properties

Yun

Jung

Sung

et al. 2020

Adv Elect Materials

Self Cite

View full text Add to dashboard Cite

In recent decades, a conducting polymer film: poly(3,4-ethylenedioxythiophene) polymerized with poly(4-styrenesulfonate) (PEDOT:PSS) has been employed as an essential component of flexible electronics used in practical products, owing to obvious advantages of its electrical and mechanical properties. Generally, the PEDOT:PSS shows an high electrical conductivity (>1000 S cm −1), deep work function (>5.0 eV), and good compatibility with other materials such as organic dopants, carbon nanomaterials, and inorganic nanowires, which has opened limitless possibilities for electronic application such as electrodes, charge transport layers, and thermoelectric active materials. [1-8] Some organic dopants include polar solvent additives such as dimethylsulfoxide (DMSO) and glycerol that contribute to a decrease in the Coulomb interactions between PEDOT and PSS chains and changed molecular arrangement of the PEDOT and PSS chains. [9] In addition, some non-ionic polymer surfactants have also been utilized to increase electrical conductivity of the PEDOT:PSS films by forming interconnected PEDOT networks in the PEDOT:PSS films. [10] Despite excellent electrical and mechanical properties, practical application of poly(3,4-ethylenedioxythiophene) polymerized with poly(4-styrenesulfonate) (PEDOT:PSS) face the challenge of ensuring air stability in electronic industry. Here, degradation mechanism of PEDOT:PSS-based films in air is clearly demonstrated through X-ray/ultraviolet photoelectron spectroscopy (XPS/ UPS) and its depth-profiling technique. As the duration of air-exposure increases, the PEDOT:PSS-based films alter molecular structures with the formation of SO x bond in PEDOT and CN x bond growth, changing ratios of insulating part (PSS − , PSSH, oxidized PEDOT) to conducting part and deteriorating their electrical conductivities. These transition behaviors are similar in all PEDOT:PSS-based films regardless of additives such as dopant or multi-walled carbon nanotube. Additionally, methanol treatment to various PEDOT:PSS-based films for inducing conformational change between PEDOT and PSS molecules, partly restore the electrical properties of the denatured PEDOT:PSS films. Finally, thermoelectric properties of the PEDOT:PSS-based films are characterized by investigating the effects of air-aging and methanol treatment on electrical conductivities, Seebeck coefficients, and power factors. To sum up, this study provides a useful guideline for establishing a strategy to ensure air stability of PEDOT:PSS-based films by clarifying the degradation mechanism and property recovery methods.

show abstract

Section: Resultsmentioning

confidence: 99%

In‐Situ Photoelectron Spectroscopy Study on the Air Degradation of PEDOT:PSS in Terms of Electrical and Thermoelectric Properties

Yun

Jung

Sung

et al. 2020

Adv Elect Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…The power factor and ZT values of the Brønsted acid-doped P3HT films are among the highest reported values for p-type conjugated polymers fabricated by one-step solution mixing (see Table S4, Supporting Information). [14,23,[43][44][45][46][47][48] Moreover, the Brønsted acid-doped P3HT film showed stably maintained TE properties for a long period of time (47 days), indicating superior air stabilities compared to the FeCl 3 -doped P3HT film (see Figure S10, Supporting Information, for more detailed explanation).…”

Section: Te Performances Of P3ht Films Depending On the Types Of Dopingmentioning

confidence: 99%

Brønsted Acid Doping of P3HT with Largely Soluble Tris(pentafluorophenyl)borane for Highly Conductive and Stable Organic Thermoelectrics Via One‐Step Solution Mixing

Suh

Jung

et al. 2020

Advanced Energy Materials

Self Cite

View full text Add to dashboard Cite

Molecular doping is essential for improving the thermoelectric properties of conjugated polymers, but dopants of low solubility either restrict the formation of high quality films or complicate fabrication steps. Although a highly soluble molecular dopant, tris(pentafluorophenyl)borane (BCF), has been sporadically studied, its potential has not yet been fully explored. Herein, particularly intriguing effects of Brønsted acid doping with BCF‐water complexes for poly(3‐hexylthiophene) (P3HT) are reported, which can facilitate substantial increases in electrical and thermoelectric properties with remarkable doping stabilities. Interestingly, a unique polymorph of P3HT with interdigitated alkyl chains (called type II) is observed in the Brønsted acid doping with BCF‐water complexes. Moreover, the doped P3HT shows conformational change to the quinoid structure, enabling increased backbone planarity. As a result, the Brønsted acid‐doped P3HT films exhibit outstanding electrical conductivities, thermoelectric power factors, and figure‐of‐merit of up to 33.0 S cm−1, 28.3 µW m−1 K−2, and 0.034, respectively. These values are at least an order of magnitude higher than those of P3HT films doped with a conventional molecular dopant, 7,7,8,8‐tetracyano‐2,3,5,6‐tetrafluoroquinodimethane. The Brønsted acid doping with BCF‐water complexes also affords excellent air stabilities of P3HT films, which potentially provides a strong comparative advantage over existing highly reactive salt‐type dopants, such as FeCl3.

show abstract

“…sources, where: energy can be harvested from mechanical energy (e.g., triboelectric nanogenerators [252] ), light energy (e.g., solar cells [8] ), thermal energy, [253,254] and chemical energy; and these energies can be stored in batteries and supercapacitors. [8,[255][256][257] As we have discussed the self-healable perovskite solar cell and supercapacitors, [8] those will not be further elaborated here.…”

Section: Battery and Energy Harvestersmentioning

confidence: 99%

Progress and Roadmap for Intelligent Self‐Healing Materials in Autonomous Robotics

et al. 2020

View full text Add to dashboard Cite

self-repair in order to survive and thrive. Soft to hard tissues can self-regenerate when injured, including the skin and bones. [6] Some of the living tissues, such as nails and bones, can even continuously remodeling themselves, removing the damaged tissues unintentionally and replaced by newly grown tissues. However, unlike regenerative and remodeling capabilities in nature, robots are made from nonliving synthetic materials such as polymers and metals. Hence, as we develop robots to have greater autonomy and capabilities, having the ability to self-heal or self-repair is becoming more critical, if not, essential, especially from an environmental sustainability point of view. [2,[7][8][9][10][11] The term self-healing materials, also often referred to as self-mending or selfrepairing materials, are materials that can regain some or most of its original material properties when damaged. In synthetic materials, the self-healing materials repair their damage without regenerative origins. As these selfhealing materials undergo self-repair, they regain their original intended functions through the recovery of the desired material properties, without an increase in original mass.As the number of self-healing materials is growing at a rapid clip, we first establish a brief history in this review to help the reader gain a broader perspective on self-healing materials. We emphasize on self-healing materials that recover their mechanical properties, because mechanical properties often dictate the possible applications. Figure 1 highlights the various selfhealing materials from high modulus to low modulus materials that can be used for robotic applications.There are two broad classifications for self-healing materials: a) autonomic versus nonautonomic self-healing materials; b) intrinsic versus extrinsic self-healing. [8] These self-healing materials can recover their properties either autonomously, i.e., without significant external intervention, much like human tissues; or they can also heal with external intervention, such as when some external environment changes cause temperature increment or via various triggers such as mechanical stimuli. Intrinsic self-healing materials do not need external healing agents, while extrinsic self-healing materials contain external healing agents for the healing of the matrix materials. In addition to those classifications, we will provide new insights on classifying these materials further into this review.In Section 2, we discuss various types of smart biomimetic robots where self-healing materials can be beneficial. Section 3 Robots are increasingly assisting humans in performing various tasks. Like special agents with elite skills, they can venture to distant locations and adverse environments, such as the deep sea and outer space. Micro/nanobots can also act as intrabody agents for healthcare applications. Self-healing materials that can autonomously perform repair functions are useful to address the unpredictability of the environment and the increasing drive toward the autonom...

show abstract

Self‐Healable and Stretchable Organic Thermoelectric Materials: Electrically Percolated Polymer Nanowires Embedded in Thermoplastic Elastomer Matrix

Cited by 52 publications

References 62 publications

In‐Situ Photoelectron Spectroscopy Study on the Air Degradation of PEDOT:PSS in Terms of Electrical and Thermoelectric Properties

In‐Situ Photoelectron Spectroscopy Study on the Air Degradation of PEDOT:PSS in Terms of Electrical and Thermoelectric Properties

Brønsted Acid Doping of P3HT with Largely Soluble Tris(pentafluorophenyl)borane for Highly Conductive and Stable Organic Thermoelectrics Via One‐Step Solution Mixing

Progress and Roadmap for Intelligent Self‐Healing Materials in Autonomous Robotics

Contact Info

Product

Resources

About