Mechanical robust paper-based triboelectric nanogenerator films

Ikuno, Takashi; Takita, Ryuto; Nagasawa, Rintarou; Hara, Kohei; Zhou, Qingyang

doi:10.35848/1347-4065/acf79e

Jpn. J. Appl. Phys.

2023

DOI: 10.35848/1347-4065/acf79e

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Mechanical robust paper-based triboelectric nanogenerator films

Takashi Ikuno,

Ryuto Takita,

Rintarou Nagasawa

et al.

Abstract: We have fabricated paper-based triboelectric nanogenerator (TENG) films, which are composed of polydimethylsiloxane (PDMS) and a copy paper. The Young's modulus of the paper-based TENG film was approximately 807 MPa, which was 1500 times higher than that of the pure PDMS film with the same thickness. The output voltage of the TENG with the paper/PDMS film was comparable with that of the PDMS film. The maximum power density of the TENGs with the paper/PDMS film was 181 μW/cm2. Furthermore, we demonstrated lumin… Show more

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2024

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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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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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Electric power transmission in triboelectric generators activated through dipolar depolarization

Taguchi,

Manaka,

Iwamoto

2024

Journal of Applied Physics

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The entropy change causing dipolar depolarization is proposed as an origin of electrical power generation in triboelectric generators using polar materials. Rubbing mechanically forces permanent dipoles in materials to become orientationally ordered, establishing a low entropy state with an initial dipolar polarization P0. In this state, the electric field within the materials is zero, but a nonzero Helmholtz free energy F=F0=P022(Cs−C∞) arises from the entropy contribution (Cs, static capacitance; C∞, capacitance at high frequency). Consequently, this state is energetically unstable and undergoes a spontaneous transition into a disordered high entropy state with F<F0, resulting in the establishment of a non-zero electric field. Through this process, the energy bounded in materials as the entropy component of free energy is converted, and the electrical energy becomes F0η with η=1−C∞Cs(0<η<1). Electrical circuit analysis shows that this energy conversion process can be well represented by introducing a virtual resistance Rp=τCs−C∞ (τ, dipolar relaxation time). This suggests that the entropy change in finite time τ serves as the origin of electrical power generators. Under the matching condition τ=CsR, the power spectrum at the load is best aligned with that at the generator, maximizing the power transmission. The results presented here serve as a basis for understanding the principle of electric power transmission in triboelectric generators through dipolar depolarization.

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Mechanical robust paper-based triboelectric nanogenerator films

Cited by 2 publications

References 22 publications

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

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

Electric power transmission in triboelectric generators activated through dipolar depolarization

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