Electrostatic charges and their distribution on the charged surfaces probed by sum-frequency generation spectroscopy

Isaka, Yuka; Miyamae, Takayuki

doi:10.35848/1882-0786/acb1ec

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…[12] Solid-solid and liquid-solid interfaces have been investigated to enhance the power output; [13][14][15][16] meanwhile high-tech characterization and the evaluation of excessive charges are fully utilized. [17][18][19] However, this process is no longer complete. In addition to excessive electronic charges, dipolar polarization charges are available as sources of electrical energy in electric circuits.…”

Section: Introductionmentioning

confidence: 99%

Dipolar Energy as an Electrical Power Source: Dipole Rotation in Solids Enables a New Source for the Triboelectric Generator

Taguchi

Manaka

Iwamoto

2023

Physica Status Solidi (a)

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Herein, the concept of triboelectric generators using dipolar polarization energy as an electrical power source is introduced. Dipolar polarization energy is stored in dielectric films by rubbing, and is conveyed to external circuits for use during the depolarization process. Pyromellitic dianhydride‐4,4’‐oxydianiline polyimide films are used as a possible candidate for triboelectric generators, where polarization is formed by rubbing owing to the orientational alignment of polar molecular groups. The current–voltage measurements are used to evaluate the equivalent‐circuit parameters of the generator. The current source is 0.07 nA at 30 °C, which is enhanced to 0.13 nA at 110 °C. It is indicated in these results that the depolarization process proceeds in a short time at higher temperatures, causing an increase in the current. Consequently, the maximum power increases from 18 nW (30 °C) to 33 nW (110 °C). The enhancement of the output power at higher temperatures well supports the idea of using dipolar polarization energy as a power source of triboelectric generators.

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Section: Introductionmentioning

confidence: 99%

Dipolar Energy as an Electrical Power Source: Dipole Rotation in Solids Enables a New Source for the Triboelectric Generator

Taguchi

Manaka

Iwamoto

2023

Physica Status Solidi (a)

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In Situ Observation of Orientational Ordering in Polyimide Triboelectric Generators by Using Optical Second-Harmonic Generation Measurement

Maeda,

Taguchi,

Manaka

2024

J. Phys. Chem. Lett.

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By using in situ optical second-harmonic generation (SHG) measurement, dynamical changing of polar molecular orientations caused by mechanical rubbing of polyimide triboelectric generators is observed. The polar orientational order is enhanced during rubbing, which relaxes with the time constant τ = 7.1 s. Analysis of s-and p-polarized SHG intensity under s-polarized laser incidence showed that molecules align along the rubbing direction with the tilt angle θ 0 = 51°from the surface normal. By using the obtained time constant and the tilt angle, the output power in the I−V measurement is discussed. That is, the SHG result gives a theoretical maximum power of 2.0 μW/cm 2 , while the effective power observed in the I−V measurement is 0.26 μW/cm 2 , suggesting that merely part of produced power is received at external loads. The in situ SHG measurement gives helpful ways to discuss the power output of triboelectric generators using polar materials.

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Experimental and Theoretical Approaches for Detecting Latent Lateral Leakage Current of Organic Light-Emitting Diodes

Morimoto,

Satoh,

Noh

et al. 2024

ACS Appl. Electron. Mater.

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High-resolution organic light-emitting diode (OLED) displays often suffer from image quality deterioration due to lateral leakage current (LLC). We performed the detection of LLC using operando electric-field-induced doubly resonant sum-frequency generation (EFI-DR-SFG) measurements under conditions where the electric potential, formed by the LLC to an adjacent pixel, was below the emission threshold voltage for the use of OLEDs. The EFI-DR-SFG outputs of the voltage-applied pixel and its adjacent pixel (nonvoltage-applied pixel) were compared as voltage was applied to the OLEDs. In the case of the OLEDs without LLC generation, changes in the EFI-SFG output according to the applied voltage were confirmed only in the voltage-applied pixel, and the SFG output did not change in the adjacent pixel. However, in the case of OLEDs with LLC, changes in SFG output could be observed in the adjacent pixel depending on the electric potential formed by the LLC. These results can potentially lead toward the detection and precise control of hidden LLC prior to light emission, which could not be detected by the conventional emission method.

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Electrostatic charges and their distribution on the charged surfaces probed by sum-frequency generation spectroscopy

Cited by 4 publications

References 30 publications

Dipolar Energy as an Electrical Power Source: Dipole Rotation in Solids Enables a New Source for the Triboelectric Generator

Dipolar Energy as an Electrical Power Source: Dipole Rotation in Solids Enables a New Source for the Triboelectric Generator

In Situ Observation of Orientational Ordering in Polyimide Triboelectric Generators by Using Optical Second-Harmonic Generation Measurement

Experimental and Theoretical Approaches for Detecting Latent Lateral Leakage Current of Organic Light-Emitting Diodes

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