Transparent Flexible Graphene Triboelectric Nanogenerators

Kim, Seongsu; Gupta, Manoj; Lee, Keun Young; Sohn, Ahrum; Kim, Tae Yun; Shin, Ki Soon; Kim, Dohwan; Kim, Sung Kyun; Lee, Kang Hyuck; Shin, Hyun-Tae; Kim, Dong Wook; Kim, Sang Woo

doi:10.1002/adma.201400172

Cited by 420 publications

(271 citation statements)

References 47 publications

(60 reference statements)

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“…Complicated tactile sensing system under bland skin is illustrated in Figure 15 . At present, pressure sensors are primarily based on the strength induced variation in capacitance,149, 150 piezoelectricity,151, 152 resistivity,17 triboelectricity 153. And graphene has been applied in the design of light and wearable pressure sensors.…”

Section: The Human‐like Senses and Feedbacksmentioning

confidence: 99%

Human‐Like Sensing and Reflexes of Graphene‐Based Films

et al. 2016

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Humans have numerous senses, wherein vision, hearing, smell, taste, and touch are considered as the five conventionally acknowledged senses. Triggered by light, sound, or other physical stimulations, the sensory organs of human body are excited, leading to the transformation of the afferent energy into neural activity. Also converting other signals into electronical signals, graphene‐based film shows its inherent advantages in responding to the tiny stimulations. In this review, the human‐like senses and reflexes of graphene‐based films are presented. The review starts with the brief discussions about the preparation and optimization of graphene‐based film, as where as its new progress in synthesis method, transfer operation, film‐formation technologies and optimization techniques. Various human‐like senses of graphene‐based film and their recent advancements are then summarized, including light‐sensitive devices, acoustic devices, gas sensors, biomolecules and wearable devices. Similar to the reflex action of humans, graphene‐based film also exhibits reflex when under thermal radiation and light actuation. Finally, the current challenges associated with human‐like applications are discussed to help guide the future research on graphene films. At last, the future opportunities lie in the new applicable human‐like senses and the integration of multiple senses that can raise a revolution in bionic devices.

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Section: The Human‐like Senses and Feedbacksmentioning

confidence: 99%

Human‐Like Sensing and Reflexes of Graphene‐Based Films

et al. 2016

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“…A vast amount of advanced materials would be good choices, such as graphene, 38,39 carbon nanotube, 40 and nano-Ag ink. 41 It is found that nanoscale roughness on graphene can increase the surface charges, which can improve the output power of the TENG.…”

Section: Prospects and Challengesmentioning

confidence: 99%

“…In the last 5 years, a significant amount of research work has been achieved to improve the performance and application of flexible TENGs. [14][15][16] This review focuses on the progress of TENGs as flexible power sources for flexible electronics, which contain both scientific understanding and technology developments. First, we present a summary of the basic principle of TENGs, including fundamentals, structural designs, work mechanism, and output performance.…”

Section: Introductionmentioning

confidence: 99%

Triboelectric nanogenerators as flexible power sources

2017

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The triboelectric nanogenerator (TENG) as a new power-generation technology was reported by Wang and co-workers in 2012. Because of its great potential for scavenging mechanical energy from living environment and sustainably driving portable devices, many researchers have developed various methods to improve output performances of TENG. In this paper, we review the progress in TENG made as flexible power sources by integrating flexible materials and stretching structures, especially for the applications of flexible electronics. For optimizing performances of TENG, the structural designs, material selections, and hybrid energy cells are presented. The reported TENG as flexible power sources has the potential applications in lighting up light emitting diodes (LEDs), powering sensors, and monitoring biomechanical motions.

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“…In addition, transparent TENGs using indium tin oxide (ITO) or graphene as electrodes have been achieved, which enable applications that require high transparency such as touch screens [31][32][33][34][35] . Our previous work shows that using C 4 F 8 to treat uncured PDMS could deposit fluorocarbon polymer and a wrinkle structure in single step [18][19][20] , which had the advantage of significantly increasing the performance of the flexible TENG.…”

Section: Introductionmentioning

confidence: 99%

Controlled fabrication of nanoscale wrinkle structure by fluorocarbon plasma for highly transparent triboelectric nanogenerator

Cheng

Miao

et al. 2017

Microsyst Nanoeng

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In this paper, we report a novel nanoscale wrinkle-structure fabrication process using fluorocarbon plasma on poly (dimethylsiloxane) (PDMS) and Solaris membranes. Wrinkles with wavelengths of hundreds of nanometers were obtained on these two materials, showing that the fabrication process was universally applicable. By varying the plasma-treating time, the wavelength of the wrinkle structure could be controlled. Highly transparent membranes with wrinkle patterns were obtained when the plasmatreating time was o 125 s. The transmittances of these membranes were 490% in the visible region, making it difficult to distinguish them from a flat membrane. The deposited fluorocarbon polymer also dramatically reduced the surface energy, which allowed us to replicate the wrinkle pattern with high precision onto other membranes without any surfactant coating. The combined advantages of high electron affinity and high transparency enabled the fabricated membrane to improve the performance of a triboelectric nanogenerator. This nanoscale, single-step, and universal wrinkle-pattern fabrication process, with the functionality of high transparency and ultra-low surface energy, shows an attractive potential for future applications in microand nanodevices, especially in transparent energy harvesters. INTRODUCTIONPatterned surface structures on the nano-or micrometer scale have a significant role in the properties of a material, including physical, mechanical, electrical, and optical 1 . The fabrication process for these patterns has been traditionally realized by photolithography, printing processes, embossing, or writing techniques, of which the relatively high cost and low throughput limit their application for producing complex topologies over large areas. Thereby, selfassembled patterns for large-area patterning, which generally employ physical-chemical or mechanical instabilities within a constrained system to form highly ordered structures, have attracted great attention for many years 2-7 . Among these methods, mechanically inducing a wrinkle structure on a bilayer system is especially suited to creating highly ordered microstructures across a large surface and features convenient fabrication and a tunable wavelength by adjusting the thickness of the stiff layer and the prestrain [8][9][10][11][12] . As a result, wrinkle structures have been used in various applications, such as smart adhesion, liquid/cell shaping, particle assembly, optical surfaces, flexible electronic devices, and energy harvesters [13][14][15][16][17][18][19][20] . To date, most studies involving wrinkling to create ordered structures rely on plasma or ultraviolet-ozonolysis (UVO) oxidation and metal deposition to create the stiff skin. Although these approaches are quite practical, the material properties of the substrate during oxidation can significantly alter the typical morphologies and even block the formation of the wrinkle structure (that is, the process does not have universality to different materials), whereas the deposition of the metal la...

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Transparent Flexible Graphene Triboelectric Nanogenerators

Cited by 420 publications

References 47 publications

Human‐Like Sensing and Reflexes of Graphene‐Based Films

Human‐Like Sensing and Reflexes of Graphene‐Based Films

Triboelectric nanogenerators as flexible power sources

Controlled fabrication of nanoscale wrinkle structure by fluorocarbon plasma for highly transparent triboelectric nanogenerator

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