Surface structural analysis of a friction layer for a triboelectric nanogenerator

Tcho, Il‐Woong; Kim, Weon‐Guk; Jeon, Seungwon; Park, Sang-Jae; Lee, Boung Ju; Bae, Hee-Kyoung; Kim, Daewon; Choi, Yang‐Kyu

doi:10.1016/j.nanoen.2017.10.037

Cited by 102 publications

(60 citation statements)

References 29 publications

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“…The complex‐morphology OL‐DTH‐MN with deep MN height and high contact surface area significantly contributes to output performance during contact‐and‐separation deformation to create more triboelectric charges. [ 10 ] In brief, we not only propose the OL‐DTH‐MN with the increased total contact surface area from higher pattern density and MN height but also promote much more deformation during contact‐separation mode than the OL‐MN‐TENG; the highest contact surface area can induce high contact charge transfer for enhancing triboelectric charge density. [ 21,22 ] This crucial complex‐morphology OL‐DTH‐MN‐TENG with high contact area is important for the high‐performance TENG development and widespread applications.…”

Section: Resultsmentioning

confidence: 99%

“…[ 13 ] It is a crucial approach by increasing the surface contact area of morphology to enhance the performance for improving the sensitivity of force sensor. For the modified morphology engineering, various micro/nano morphologies structures have been applied to TENG such as nano lines, cubes, pyramids, [ 13 ] nano pillars and domes, [ 10 ] nano patterns, [ 14 ] wrinkles, [ 15 ] micro pillar, [ 16 ] and microneedles [ 17 ] as listed in Table 1 . Some researches analyzing the effect of morphology on the output performance reported that increasing the contact area of tribo‐materials may generate more triboelectric charge during the contact and friction process.…”

Section: Introductionmentioning

confidence: 99%

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High‐Performance Al/PDMS TENG with Novel Complex Morphology of Two‐Height Microneedles Array for High‐Sensitivity Force‐Sensor and Self‐Powered Application

Chung

2020

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Triboelectric nanogenerators (TENGs) are widely applied to self‐powered devices and force sensors. TENGs consist of the electrode‐layer frequently made of high‐cost conductors (Ag, Au, ITO) and the tribo‐layer of rigid negative‐triboelectricity fluoropolymers (PTFE, FEP). The surface morpholoy is studied for enhancing performance. Here, a high‐performance Al/PDMS‐TENG is proposed with a complex morphology of overlapped deep two‐height microneedles (OL‐DTH‐MN) fabricated by the integrated process of low‐cost CO2 laser ablation and PDMS casting for self‐powered devices and high‐sensitivity force/pressure sensors. The high open‐circuit voltage and short‐circuit current of the OL‐DTH‐MN‐TENG are 167 V and 129.3 µA. Also, the sensitivity of the force/pressure sensor of the OL‐DTH‐MN‐TENG is very high, 1.03 V N−1 and about 3.11 V kPa−1, at an area of 30 cm2 that is much higher than the sensitivity of about 0.18–0.414 V N−1 and 0.013–0.29 V kPa−1 of conventional TENG sensors. Meanwhile, the high‐performance OL‐DTH‐MN‐TENG not only exhibits the energy storage capability of charging a 0.1 µF capacitor to 2.75 V at 1.19 s, to maximum 3.22 V, but also activates various self‐powered devices including lighting colorful 226 LEDs connected in series, the “2020‐ME‐NCKU” advertising board, a calculator and a temperature sensor. Numerical simulation is also performed to support the experiments.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐Performance Al/PDMS TENG with Novel Complex Morphology of Two‐Height Microneedles Array for High‐Sensitivity Force‐Sensor and Self‐Powered Application

Chung

2020

Small

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“…It has been thought that the enhancement of triboelectrification output of the micro/nanostructured surfaces can mainly be attributed to the increase in friction area. However, in some cases, particularly in a surface structured with cylindrical micropatterns, the increase in contact area might not be sufficient to explain the significant improvement of the output electrification compared to that of the planar surface . Recently, Wu et al proved that the amount of charge transfer is not only determined by the friction area, but also significantly affected by stress in the contact region .…”

Section: Resultsmentioning

confidence: 99%

Treefrog Toe Pad‐Inspired Micropatterning for High‐Power Triboelectric Nanogenerator

Bui

Zhou

Kim

et al. 2019

Adv Funct Materials

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Inspired by treefrog's toe pads that show superior frictional properties, herein, an industrially compatible approach is reported to make an efficient dielectric tribosurface design using customizable nonclosepacked microbead arrays, mimicking the friction pads of treefrogs, in order to significantly enhance electrification performance and reliability of triboelectric nanogenerator (TENG). The approach involves using an engineering polymer to prepare a highly ordered large-area concave film, and subsequently the molding of a convex patterned triboreplica in which the concave film is exploited as a reusable master mold. A natureinspired TENG based on the patterned polydimethylsiloxane (PDMS) paired with flat aluminum (Al) can generate a relatively high power density of 8.1 W m −2 even if a very small force of ≈6.5 N is applied. Moreover, the convex patterned PDMS-based TENG possesses exceptional durability and reliability over 25 000 cycles of contact-separation. Considering the significant improvements in power generation of TENG; particularly at very small force, together with cost-effectiveness and possibility of mass production, the present methodology may pave the way for large-scale blue energy harvesting and commercialization of TENGs for many practical applications.

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“…[ 69 ]); d an illustration of the fabrication of the dome-shaped and pillar-shaped nanostructures by the replica molding process on the silicon wafers, and their surface taken by an atomic force microscope (Reproduced with permission from Ref. [ 70 ]) …”

Section: Enhancement Of Triboelectric Charge Densitymentioning

confidence: 99%

Structural and Chemical Modifications Towards High-Performance of Triboelectric Nanogenerators

et al. 2021

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Harvesting abundant mechanical energy has been considered one of the promising technologies for developing autonomous self-powered active sensors, power units, and Internet-of-Things devices. Among various energy harvesting technologies, the triboelectric harvesters based on contact electrification have recently attracted much attention because of their advantages such as high performance, light weight, and simple design. Since the first triboelectric energy-harvesting device was reported, the continuous investigations for improving the output power have been carried out. This review article covers various methods proposed for the performance enhancement of triboelectric nanogenerators (TENGs), such as a triboelectric material selection, surface modification through the introduction of micro-/nano-patterns, and surface chemical functionalization, injecting charges, and their trapping. The main purpose of this work is to highlight and summarize recent advancements towards enhancing the TENG technology performance through implementing different approaches along with their potential applications. Graphic Abstract This paper presents a comprehensive review of the TENG technology and its factors affecting the output power as material selection, surface physical and chemical modification, charge injection, and trapping techniques.

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Surface structural analysis of a friction layer for a triboelectric nanogenerator

Cited by 102 publications

References 29 publications

High‐Performance Al/PDMS TENG with Novel Complex Morphology of Two‐Height Microneedles Array for High‐Sensitivity Force‐Sensor and Self‐Powered Application

High‐Performance Al/PDMS TENG with Novel Complex Morphology of Two‐Height Microneedles Array for High‐Sensitivity Force‐Sensor and Self‐Powered Application

Treefrog Toe Pad‐Inspired Micropatterning for High‐Power Triboelectric Nanogenerator

Structural and Chemical Modifications Towards High-Performance of Triboelectric Nanogenerators

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