A Transparent and Flexible Graphene‐Piezoelectric Fiber Generator

Fuh, Yiin Kuen; Kuo, Chien Cheng; Huang, Zih Ming; Li, Shan Chien; Liu, En Rui

doi:10.1002/smll.201503605

Cited by 61 publications

(25 citation statements)

References 37 publications

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“…Therefore, the electrostatically accumulated charges were induced the electrons flow from the negatively charged bottom graphene to the positively charged top graphene. The explanation of the electric energy generation process of the GHSPS referred to the work is similar to the previously reported piezoelectric/triboelectric generator [37][38]. Figure 4b presents the simulated stress distribution of the integrated GHSPS, both piezoelectric and triboelectric components are included.…”

Section: Resultssupporting

confidence: 70%

“…Figure 1a provides a schematic illustration of the fabricating processes of a GHSPS used the transparent flexible 3×2 cm 2 single layer-graphene. At first, a single layer graphene was initially grown on a Cu foil via CVD similar to previous study [37]. Next, the well-known wet transfer method was utilized to transfer the single layer graphene onto a flexible PET substrate.…”

mentioning

confidence: 99%

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A fully packaged self-powered sensor based on near-field electrospun arrays of poly(vinylidene fluoride) nano/micro fibers

Fuh¹,

Chen

et al. 2018

Express Polym. Lett.

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Section: Resultssupporting

confidence: 70%

mentioning

confidence: 99%

A fully packaged self-powered sensor based on near-field electrospun arrays of poly(vinylidene fluoride) nano/micro fibers

Fuh¹,

Chen

et al. 2018

Express Polym. Lett.

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“…Based on the voltage or current signals derived from piezoelectric, triboelectric or pyroelectric effect, they can detect human activities (motions, breathing, pulse, etc.) [191,[274][275][276]. However, these self-powered sensors still require external power for operating the measurement systems and reading of the signals.…”

Section: Discussionmentioning

confidence: 99%

Advanced carbon materials for flexible and wearable sensors

et al. 2017

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Flexible and wearable sensors have drawn extensive concern due to their wide potential applications in wearable electronics and intelligent robots. Flexible sensors with high sensitivity, good flexibility, and excellent stability are highly desirable for monitoring human biomedical signals, movements and the environment. The active materials and the device structures are the keys to achieve high performance. Carbon nanomaterials, including carbon nanotubes (CNTs), graphene, carbon black and carbon nanofibers, are one of the most commonly used active materials for the fabrication of high-performance flexible sensors due to their superior properties. Especially, CNTs and graphene can be assembled into various multi-scaled macroscopic structures, including one dimensional fibers, two dimensional films and three dimensional architectures, endowing the facile design of flexible sensors for wide practical applications. In addition, the hybrid structured carbon materials derived from natural bio-materials also showed a bright prospect for applications in flexible sensors. This review provides a comprehensive presentation of flexible and wearable sensors based on the above various carbon materials. Following a brief introduction of flexible sensors and carbon materials, the fundamentals of typical flexible sensors, such as strain sensors, pressure sensors, temperature sensors and humidity sensors, are presented. Then, the latest progress of flexible sensors based on carbon materials, including the fabrication processes, performance and applications, are summarized. Finally, the remaining major challenges of carbon-based flexible electronics are discussed and the future research directions are proposed. [56,57], have been used as the active components for the fabrication of flexible sensors. Among these materials, metal NPs can be used to fabricate flexible sensors with high sensitivity, but the sensing range and stretchability of these sensors are limited [58]. Besides, due to the limited chemical stability and reproducibility of metal nanowires, it is challenging to fabricate stable sensors using metal nanowires [10]. Similarly, conductive polymers with poor stability and conductivity are also difficult to be used for the fabrication of high-performance sensors [59]. In contrast, carbon materials are one of the most commonly investigated materials, especially CNTs and graphene (including graphene oxide (GO) and reduced graphene oxide (rGO)), due to their remarkable mechanical, electrical and thermal properties. To implement macroscopic applications, CNTs and graphene with superior properties in microscopic level should be converted into macroscopic functional assemblies, such as one dimensional (1D) fibers or yarns [60,61], two dimensional (2D) films or sheets [62,63], three dimensional (3D) architectures [64][65][66] (Fig. 1). The multi-scaled macroscopic carbon nanomaterials endow the flexible sensors with high sensitivity, excellent flexibility and good stability as well as desired configurations. Also, lo...

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“…Various commercial organic materials (e.g., nylon, cotton, silk, PVDF, rubber) and inorganic materials (e.g., MoS 2 , MoSe 2 , WS 2 , WSe 2 , TiO 2 , Si) have been utilized to prepare TENGs and have exhibited remarkable performance . Some advanced materials, such as hydrogels, carbon materials (graphene and carbon nanotubes (CNT)) and natural biodegradable materials, have also been investigated for their triboelectricity in TENGs …”

Section: Materials For Energy Conversion Devicesmentioning

confidence: 99%

Fiber‐Based Energy Conversion Devices for Human‐Body Energy Harvesting

et al. 2019

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body is actually a tremendous storehouse of energy that is generated from body heat and motion. [15][16][17][18][19] Power generation from breathing, heating, blood transport, arm motion, typing, and walking could reach to over 100 W for a 68 kg adult's daily activities (Figure 1). [20] Thus, converting 1% of power from the human body may be enough to support the work of most portable electronics.In the past two decades, researchers have developed several energy conversion devices based on piezoelectricity, electrostaticity, triboelectricity, or thermoelectricity that can directly harvest the mechanical or thermal energy and convert it into electric energy (these conversion devices are so-called nanogenerators (NGs)). [21][22][23][24][25] The first nanogenerator (NG) based on ZnO was invented by Prof. Wang in 2006; after that, various NGs were developed to harvest the mechanical or thermal energy with the output performance increasing gradually. [26] These NGs are easy-to-construct flexible devices since most materials for these devices are polymers and nanomaterials. Generally, the flexible devices assembled by film materials can be stretchable and bendable in one direction. But their lack of air-permeability, poor 3D deformation, and low damage tolerance limit their application, especially for wearable electronics. Therefore, fiberbased energy conversion devices have been designed. [27] These fiber-based devices can also be knitted to yarn or fabric in the clothing system to build up a large area electronic system. [28,29] The energy generation and internal charging can be realized by means of a self-powered system that harvests the energy from natural sources around the human body to sustain the wearable electronics. [30][31][32] The search for functional materials that possess good conversion efficiency, as well as great mechanical and environmental stability, combined with a novel device design might push these devices to meet the requirement of a practical application. In the past decade, numerous contributions have been offered to improve the performance of fiber-based energy conversion devices (FBECD) and extend its application. This review specifically summarizes FBECD with different energy conversion mechanisms including piezoelectricity, electrostaticity, triboelectricity, and thermoelectricity in recent processes (Figure 2). The functional materials, fiber fabrication techniques, and device design strategies for different classes of FBECDs are covered in the article. We also introduce an overview of the fiber-based self-powered system and sensors and Following the rapid development of lightweight and flexible smart electronic products, providing energy for these electronics has become a hot research topic. The human body produces considerable mechanical and thermal energy during daily activities, which could be used to power most wearable electronics. In this context, fiber-based energy conversion devices (FBECD) are proposed as candidates for effective conversion of human-body energy into electricity...

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A Transparent and Flexible Graphene‐Piezoelectric Fiber Generator

Cited by 61 publications

References 37 publications

A fully packaged self-powered sensor based on near-field electrospun arrays of poly(vinylidene fluoride) nano/micro fibers

A fully packaged self-powered sensor based on near-field electrospun arrays of poly(vinylidene fluoride) nano/micro fibers

Advanced carbon materials for flexible and wearable sensors

Fiber‐Based Energy Conversion Devices for Human‐Body Energy Harvesting

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