Heterogeneity of surface potential in contact electrification under ambient conditions: A comparison of pre- and post-contact states

Barnes, Austin M.; Dinsmore, A. D.

doi:10.1016/j.elstat.2016.04.002

Cited by 16 publications

(11 citation statements)

References 37 publications

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“…However, when the AFR and PTFE surfaces were brought in contact for 10 sec, there was a significant shift in the surface potential for the AFR samples from 1.187 V to 1.206 V. However, any further cycling or contacting/rubbing of the AFR and PTFE surface did not affect the surface potential of the AFR visibly, and it remained centred around the 1.206 V value. This trend of the upshift in the surface potential of the tribo-positive material is in line with that observed by Baytekin et al and Barnes et al [53,54]. However, their use of soft, high tack PDMS ensures higher conformity of the tribo-surfaces leading to a significantly higher difference in the observed surface potentials (up to 100 mV) [53,54].…”

Section: Nanoscale Insight Into Performance Of Afr/ptfe Tengssupporting

confidence: 89%

“…This trend of the upshift in the surface potential of the tribo-positive material is in line with that observed by Baytekin et al and Barnes et al [53,54]. However, their use of soft, high tack PDMS ensures higher conformity of the tribo-surfaces leading to a significantly higher difference in the observed surface potentials (up to 100 mV) [53,54].…”

Section: Nanoscale Insight Into Performance Of Afr/ptfe Tengssupporting

confidence: 89%

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Expanding the portfolio of tribo-positive materials: Aniline formaldehyde condensates for high charge density triboelectric nanogenerators

et al. 2020

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The rapid uptake of energy harvesting triboelectric nanogenerators (TENGs) for self-powered electronics requires the development of high-performance tribo-materials capable of providing large power outputs. This work reports on the synthesis and use of aniline formaldehyde resin (AFR) for energy-harvesting applications. The facile, acidic-medium reaction between aniline and formaldehyde produces the aniline-formaldehyde condensate, which upon an in-vacuo high temperature curing step provides smooth AFR films with abundant nitrogen and oxygen surface functional groups which can acquire a tribo-positive charge and thus endow AFR with a significantly higher positive tribo-polarity than the existing state-of-art polyamide-6 (PA6). A TENG comprising of optimized thin-layered AFR against a polytetrafluoroethylene (PTFE) film produced a peak-to-peak voltage of up to ~1,000 V, a current density of ~65 mA m-2 , a transferred charge density of ~200 μC m-2 and an instantaneous power output (energy pulse) of ~11 W m-2 (28.1 μJ cycle-1), respectively. The suitability of AFR was further supported through the Kelvin probe force microscopy (KPFM) measurements, which reveal a significantly higher average surface potential value of 1.147 V for AFR as compared to 0.87 V for PA6 and a step-by-step increase of the surface potential with the increase of energy generation cycles. The work not only proposes a novel and scalable mouldable AFR synthesis process but also expands with excellent prospects, the current portfolio of tribo-positive materials for triboelectric energy harvesting applications.

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Section: Nanoscale Insight Into Performance Of Afr/ptfe Tengssupporting

confidence: 89%

Section: Nanoscale Insight Into Performance Of Afr/ptfe Tengssupporting

confidence: 89%

Expanding the portfolio of tribo-positive materials: Aniline formaldehyde condensates for high charge density triboelectric nanogenerators

et al. 2020

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“…100 mV higher than that without electrification and showed more positive values after repeated contact electrification (Figure S1). The surface charge density (σ) on Au by contact electrification can be calculated using the simple capacitor model: 19 V h where ε 0 is the vacuum permittivity (8.854 × 10 −12 F/m), ΔV CPD (100 mV) is the V CPD change of Au before and after PDMS contact, and h is the lift height (10 nm) between a tip and Au film during KPFM measurement. In the results, σ is 8.8 nC/cm 2 on Au by contact electrification and shows similar levels with previously reported values in air.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Can Static Electricity on a Conductor Drive a Redox Reaction: Contact Electrification of Au by Polydimethylsiloxane, Charge Inversion in Water, and Redox Reaction

et al. 2018

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We investigated the static charge generation by contact electrification between Au and polydimethylsiloxane (PDMS) and the redox reaction by the static charge in the aqueous phase, to reveal the mechanism of contact electrification and redox reaction which may be applied to mechanical-to-chemical energy harvesting. First, the static charge distribution on the equipotential Au was probed through Kelvin probe force microscopy (KPFM) in air after the contact with patterned PDMS. Positive charges are localized on the contact areas indicating the ion migration while the polarity becomes negative after water contact. Second, the redox reaction by the charged Au was electrochemically monitored using open circuit potential (OCP), stripping voltammetry, and copper underpotential deposition (UPD). All electrochemical experiments consistently resulted in the reduction of the reactant by the charged Au within the highly dielectric water media. We concluded that the reduction is not driven by the discharge of static charge on Au but by reducing radicals.

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“…Another interesting but perplexing question is how electrostatic charge becomes distributed on surfaces. It has long been known that charged surfaces are not uniformly charged, but rather have significant spatial heterogeneity in the magnitude of charge, and often even the polarity of the charge. − More recently, it has been shown that these charge distributions occur with micrometer-scale positive and negative regions existing side by side. − In fact, complex micrometer-scale “charge mosaics” are found to form on insulator surfaces. − …”

Section: Introductionmentioning

confidence: 99%

Microscale Bipolar Charge Distributions on Surfaces after Liquid Wetting and Evaporation in an Electric Field

2021

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Studies have shown that when insulator surfaces become electrostatically charged, complex spatial distributions of charge are produced, which are made up of micrometer-scale regions of both charge polarities. The origin of these charge patterns, often called “charge mosaics”, is not understood. Here, we carried out controlled Kelvin force microscopy experiments on microfabricated interdigitated electrode systems to show that the process of wetting a surface by a liquid followed by evaporation of the liquid in an electric field can lead to neighboring micrometer-scale regions of positive and negative charge, which remain stable long after the electric field is removed. We thus suggest that local electric fields, perhaps due to the existing charge on the surface, can act in concert with liquid evaporation to contribute to the creation of charge mosaics.

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Heterogeneity of surface potential in contact electrification under ambient conditions: A comparison of pre- and post-contact states

Cited by 16 publications

References 37 publications

Expanding the portfolio of tribo-positive materials: Aniline formaldehyde condensates for high charge density triboelectric nanogenerators

Expanding the portfolio of tribo-positive materials: Aniline formaldehyde condensates for high charge density triboelectric nanogenerators

Can Static Electricity on a Conductor Drive a Redox Reaction: Contact Electrification of Au by Polydimethylsiloxane, Charge Inversion in Water, and Redox Reaction

Microscale Bipolar Charge Distributions on Surfaces after Liquid Wetting and Evaporation in an Electric Field

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