Force-assembled triboelectric nanogenerator with high-humidity-resistant electricity generation using hierarchical surface morphology

Jang, Dong‐Jin; Kim, Young-Hoon; Kim, Tae Yun; Koh, Kunsuk; Jeong, Unyong; Cho, Jinhan

doi:10.1016/j.nanoen.2015.12.021

Cited by 110 publications

(80 citation statements)

References 45 publications

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“…Hence, the SAM‐treated triboelectric energy harvester showed outstanding humidity resistance, resulting from the increased hydrophobicity of the surface after the SAM treatment. The increased hydrophobicity can prevent the formation of an adsorbed water layer on the contact surface, minimizing the dissipation of charges induced by triboelectrification under a highly humid environment . It is significant that our humidity‐resistant triboelectric energy harvester was prepared using a very simple fabrication method compared to similar previously reported devices and is applicable to various fabrics and surface morphologies (see Table S1 of the Supporting Information for comparison between our harvester and other recently reported humidity‐resistant triboelectric energy harvesters).…”

Section: Resultsmentioning

confidence: 94%

“…To date, there have been some efforts to impart humidity resistance to triboelectric energy harvesters . For example, Seol et al reported a triboelectric vibrational energy harvester sealed in an acrylic tube to reduce the penetration of humidity; this device showed excellent resistance to ambient humidity .…”

Section: Introductionmentioning

confidence: 99%

“…For example, Seol et al reported a triboelectric vibrational energy harvester sealed in an acrylic tube to reduce the penetration of humidity; this device showed excellent resistance to ambient humidity . Additionally, various methods for fabricating humidity‐resistant triboelectric energy harvesters have been reported, including a hydrophobic microsponge structure, nature‐replicating micro‐/nanostructure, and micro/nanosurface morphologies using polystyrene microbeads and natural materials with micro‐/nanomorphologies as a template or mold. However, no further research has been undertaken to apply these techniques to fabric‐based, wearable triboelectric energy harvesters.…”

Section: Introductionmentioning

confidence: 99%

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Humidity‐Resistant, Fabric‐Based, Wearable Triboelectric Energy Harvester by Treatment of Hydrophobic Self‐Assembled Monolayers

Kim

Pyo

Song

et al. 2018

Adv Materials Technologies

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various fabrics [7][8][9][10][11][12] and fibers [13][14][15] for fabricating triboelectric energy harvesters. Fabric-or fiber-based wearable energy harvesters facilitate lightweight energy generation systems that are comfortable for the wearer. [1] However, the output voltage of triboelectric energy harvesters is drastically reduced by adsorbed water molecules, [16] such as humidity originating from the body, rain, or other surrounding environmental conditions. In general, the output voltage of a triboelectric energy harvester is proportional to the charge density of the contact surface. [17] Under high relative humidity conditions, a thick adsorbed water layer increases the conductivity of the contact surface, causing dissipation of surface charges induced by triboelectrification to another material. [18,19] The decreased charge density of the contact surface results in the deterioration of the output voltage; therefore, there is motivation to develop a humidity-resistant, wearable, triboelectric energy harvester. To date, there have been some efforts to impart humidity resistance to triboelectric energy harvesters. [20][21][22][23][24][25][26] For example, Seol et al. reported a triboelectric vibrational energy harvester sealed in an acrylic tube to reduce the penetration of humidity; this device showed excellent resistance to ambient humidity. [20] Additionally, various methods for fabricating humidity-resistant triboelectric energy harvesters have been reported, including a hydrophobic microsponge structure, [21,22] nature-replicating micro-/nanostructure, [23] and micro/nanosurface morphologies [24,25] using polystyrene microbeads and natural materials with micro-/nanomorphologies as a template or mold. However, no further research has been undertaken to apply these techniques to fabric-based, wearable triboelectric energy harvesters.Kim et al. reported a fabric-based, wearable, humidityresistant triboelectric energy harvester by fabricating individual ZnO-polydimethylsiloxane core-shell fibers. [26] Each core-shell fiber was sealed at both sides by a polymer and then woven to prepare a fabric-based triboelectric energy harvester. This harvester showed excellent humidity resistance up to a relative humidity of 95%; however, the fabrication of the humidityresistant fabric is very complicated as it required the formation of nanostructures, fiber-combining, and sealing of each fiber.The development of fabric-based triboelectric energy harvesters is of great interest for converting human motion into electricity and is relevant for the development of wearable electronics. However, such harvesters exhibit significant degradation in performance under high humidity conditions. To solve this problem, a humidity-resistant, fabric-based triboelectric energy harvester by depositing self-assembled monolayers (SAM) to increase the hydrophobicity of the fabric surface is demonstrated. The SAM coating is compatible with various fabrics and a noticeable improvement in triboelectric performance under high humidity conditions...

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Humidity‐Resistant, Fabric‐Based, Wearable Triboelectric Energy Harvester by Treatment of Hydrophobic Self‐Assembled Monolayers

Kim

Pyo

Song

et al. 2018

Adv Materials Technologies

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“…In addition, the strong adhesion properties of pillar structures provide a new possibility for skinattachable and wearable healthcare devices 1 . Considering these geometrical effects of microstructure arrays on the performance of e-skins, previously, geometrical parameters such as shape, size, and space of microstructure arrays have been controlled to enhance the mechanical sensitivity and operation range of piezoresistive 20 and capacitive e-skins 15 and the power generation of self-powered e-skins [16][17][18][21][22][23] . Since the geometrical shape of microstructure significantly affects the contact area and localized stress of microstructure under pressure, several attempts to find the relationship between the shape of microstructure and the sensitivity of various eskins have been performed.…”

Section: Introductionmentioning

confidence: 99%

Tailoring force sensitivity and selectivity by microstructure engineering of multidirectional electronic skins

et al. 2018

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Electronic skins (e-skins) with high sensitivity to multidirectional mechanical stimuli are crucial for healthcare monitoring devices, robotics, and wearable sensors. In this study, we present piezoresistive e-skins with tunable force sensitivity and selectivity to multidirectional forces through the engineered microstructure geometries (i.e., dome, pyramid, and pillar). Depending on the microstructure geometry, distinct variations in contact area and localized stress distribution are observed under different mechanical forces (i.e., normal, shear, stretching, and bending), which critically affect the force sensitivity, selectivity, response/relaxation time, and mechanical stability of e-skins. Microdome structures present the best force sensitivities for normal, tensile, and bending stresses. In particular, microdome structures exhibit extremely high pressure sensitivities over broad pressure ranges (47,062 kPa −1 in the range of <1 kPa, 90,657 kPa −1 in the range of 1-10 kPa, and 30,214 kPa −1 in the range of 10-26 kPa). On the other hand, for shear stress, micropillar structures exhibit the highest sensitivity. As proof-of-concept applications in healthcare monitoring devices, we show that our e-skins can precisely monitor acoustic waves, breathing, and human artery/carotid pulse pressures. Unveiling the relationship between the microstructure geometry of e-skins and their sensing capability would provide a platform for future development of high-performance microstructured e-skins.

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“…A creative method for fabricating surfaces with patterned features is through self‐assembly of materials. For example, a layer of polymeric spheres (e.g., polystyrene, PS) was self‐assembled onto a surface via a force‐directed assembly into a hexagonal close‐packed colloidal array . After assembling the spheres, the liquid PDMS monomer was covered over the spheres, polymerized and peeled off to obtain the ordered hemispherical hollow microstructures on its surface left behind by the spheres.…”

Section: Strategies For Increasing Surface Chargementioning

confidence: 99%

Controlling Surface Charge Generated by Contact Electrification: Strategies and Applications

et al. 2018

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Contact electrification is the phenomenon in which charge is generated on the surfaces of materials after they come into contact. The surface charge generated has traditionally been known to cause a vast range of undesirable consequences in our lives and in industry; on the other hand, it can also give rise to many types of useful applications. In addition, there has been a lot of interest in recent years for fabricating devices and materials based on regulating a desired amount of surface charge. It is thus important to understand the general strategies for increasing, decreasing, or controlling the surface charge generated by contact electrification. Herein, the fundamental mechanisms for influencing the amount of charge generated, the methods used for implementing these mechanisms, and some of the recent interesting applications that require regulating the amount of surface charge generated by contact electrification, are briefly summarized.

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Force-assembled triboelectric nanogenerator with high-humidity-resistant electricity generation using hierarchical surface morphology

Cited by 110 publications

References 45 publications

Humidity‐Resistant, Fabric‐Based, Wearable Triboelectric Energy Harvester by Treatment of Hydrophobic Self‐Assembled Monolayers

Humidity‐Resistant, Fabric‐Based, Wearable Triboelectric Energy Harvester by Treatment of Hydrophobic Self‐Assembled Monolayers

Tailoring force sensitivity and selectivity by microstructure engineering of multidirectional electronic skins

Controlling Surface Charge Generated by Contact Electrification: Strategies and Applications

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