Triboelectrification of nanocomposites using identical polymer matrixes with different concentrations of nanoparticle fillers

Lapčinskis, Linards; Linarts, Artis; Mālnieks, Kaspars; Kim, Hyun Seung; Rubenis, Kristaps; Pudžs, Kaspars; Šmits, Krišjānis; Kovaļovs, Andrejs; Kalniņš, Kaspars; Tamm, Aile; Jeong, Chang Kyu; Šutka, Andris

doi:10.1039/d0ta12441a

Cited by 34 publications

(26 citation statements)

References 31 publications

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“…This measurement is contrary to many theories of triboelectric charging that predict no measurable charge transfer when two identical polymers are contact-separated . This is a clear indication of material transfer and heterolytic bond cleavage …”

Section: Results and Discussioncontrasting

confidence: 85%

“…37 This is a clear indication of material transfer and heterolytic bond cleavage. 38 Statistical analysis using a logistic regression model (see the Experimental Section for full details) 39 revealed a strong correlation between CED (polymer A) [98%] and CED (polymer B) [99%] with the sign (positive or negative) of the measured surface charge (Table S5). When this analysis was applied as a training set for simple machine learning, the test data were predicted with a ∼77% accuracy (Table S6).…”

Section: Resultsmentioning

confidence: 99%

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Probing Contact Electrification: A Cohesively Sticky Problem

Sherrell

Šutka

Shepelin

et al. 2021

ACS Appl. Mater. Interfaces

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Contact electrification and the triboelectric effect are complex processes for mechanical-to-electrical energy conversion, particularly for highly deformable polymers. While generating relatively low power density, contact electrification can occur at the contact–separation interface between nearly any two polymer surfaces. This ubiquitousness of surfaces enables contact electrification to be an important phenomenon to understand energy conversion and harvesting applications. The mechanism of charge generation between polymeric materials remains ambiguous, with electron transfer, material (also known as mass) transfer, and adsorbed chemical species transfer (including induced ionization of water and other molecules) all being proposed as the primary source of the measured charge. Often, all sources of charge, except electron transfer, are dismissed in the case of triboelectric energy harvesters, leading to the generation of the “triboelectric series”, governed by the ability of a polymer to lose, or accept, an electron. Here, this sole focus on electron transfer is challenged through rigorous experiments, measuring charge density in polymer–polymer (196 polymer combinations), polymer–glass (14 polymers), and polymer–liquid metal (14 polymers) systems. Through the investigation of these interfaces, clear evidence of material transfer via heterolytic bond cleavage is provided. Based on these results, a generalized model considering the cohesive energy density of polymers as the critical parameter for polymer contact electrification is discussed. This discussion clearly shows that material transfer must be accounted for when discussing the source of charge generated by polymeric mechanical energy harvesters. Thus, a correlated physical property to understand the triboelectric series is provided.

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Section: Results and Discussioncontrasting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Probing Contact Electrification: A Cohesively Sticky Problem

Sherrell

Šutka

Shepelin

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

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“…Previous studies − have shown that surface roughness is one of the most important factors influencing the output signals of TENGs. Lower surface roughness would have a smaller effective contact area and a low deformation level and therefore could generate less surface charge density during contacting and relaxing. − Therefore, such decreased V OC and I SC observed for composite films with high BT amounts are likely originated from a reduced surface contact area as supported by SEM and AFM analyses. The above characterization results indicate that the 7BT/porous composite film is the best compromise; therefore, the highest TENG output performance is observed.…”

Section: Resultsmentioning

confidence: 95%

Tuning the Dielectric Constant and Surface Engineering of a BaTiO₃/Porous PDMS Composite Film for Enhanced Triboelectric Nanogenerator Output Performance

et al. 2021

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In this work, synergistic effects derived from surface engineering and dielectric property tuning were exploited to enhance the output performance of a triboelectric nanogenerator (TENG) based on an inorganic/porous PDMS composite in a contact–separation mode. BaTiO3 (BT)/porous PDMS films with different BT weight ratios were fabricated and evaluated for triboelectric nanogenerator (TENG) application. Maximum output signals of ca. 2500 V, 150 μA, and a power density of 1.2 W m–2 are achieved from the TENG containing 7 wt % BT, which is the best compromise in terms of surface roughness, dielectric constant, and surface contact area as evidenced by SEM and AFM studies. These electrical signals are 2 times higher than those observed for the TENG without BT. The 7BT/porous PDMS-based TENG also shows high stability without a significant loss of output voltage for at least 24 000 cycles. With this optimized TENG, more than 350 LEDs are lit up and a wireless transmitter is operated within 9 s. This work not only shows the promoting effects from porous surfaces and an optimized dielectric constant but also offers a rapid and template/waste-free fabrication process for porous PDMS composite films toward large-scale production.

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“…Here, the enhancement is attributed to the adsorption of the HKUST-1 to water molecules, which impacts both the electron-trapping and the dielectric constant. These select studies demonstrated that the introduction of additives into the PDMS matrix, or onto the PDMS surface, can significantly enhance the electric performance of TEGs by increasing the bulk dielectric constant or promoting charging on the contact surfaces …”

Section: Fundamentals Of Tegsmentioning

confidence: 99%

Poly(dimethylsiloxane) for Triboelectricity: From Mechanisms to Practical Strategies

Shepelin

Sherrell

et al. 2021

Chem. Mater.

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The triboelectric effect (TE), simply described as the generation of electricity from tribology or friction, has been known for over 1500 years. TE arises from charge transfer between surfaces under contact, typically attributed to electron transfer. However, emerging understanding shows how the ion transfer and material transfer (bond cleavage) mechanisms play a key role in TE. An engineering focus on increasing the porosity, surface roughness, and use of heterogeneous materials has resulted in a recent explosion in triboelectric literature, particularly toward soft and flexible polymer devices. Here, we critically evaluate recent progress in TE generators and link engineered performance to the fundamental driving forces of triboelectricity using the exemplar triboelectric polymer poly(dimethylsiloxane).

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Triboelectrification of nanocomposites using identical polymer matrixes with different concentrations of nanoparticle fillers

Abstract: In this study, we investigate triboelectrification in polymer-based nanocomposites using identical polymer matrixes containing different concentrations of nanoparticles (NPs). The triboelectric surface charge density on polymer layers increased as the...

Cited by 34 publications

References 31 publications

Probing Contact Electrification: A Cohesively Sticky Problem

Probing Contact Electrification: A Cohesively Sticky Problem

Tuning the Dielectric Constant and Surface Engineering of a BaTiO₃/Porous PDMS Composite Film for Enhanced Triboelectric Nanogenerator Output Performance

Poly(dimethylsiloxane) for Triboelectricity: From Mechanisms to Practical Strategies

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Triboelectrification of nanocomposites using identical polymer matrixes with different concentrations of nanoparticle fillers

Abstract: In this study, we investigate triboelectrification in polymer-based nanocomposites using identical polymer matrixes containing different concentrations of nanoparticles (NPs). The triboelectric surface charge density on polymer layers increased as the...

Cited by 34 publications

References 31 publications

Probing Contact Electrification: A Cohesively Sticky Problem

Probing Contact Electrification: A Cohesively Sticky Problem

Tuning the Dielectric Constant and Surface Engineering of a BaTiO3/Porous PDMS Composite Film for Enhanced Triboelectric Nanogenerator Output Performance

Poly(dimethylsiloxane) for Triboelectricity: From Mechanisms to Practical Strategies

Contact Info

Product

Resources

About

Tuning the Dielectric Constant and Surface Engineering of a BaTiO₃/Porous PDMS Composite Film for Enhanced Triboelectric Nanogenerator Output Performance