Large-scale waterproof and stretchable textile-integrated laser- printed graphene energy storages

Thekkekara, Litty V.; Gu, Miṅ

doi:10.1038/s41598-019-48320-z

Cited by 46 publications

(39 citation statements)

References 33 publications

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“…Therefore, it is predicted that energy harvesting will be an essential part of the high power future wearables [188]. Many researchers already work on various opportunities to enable this feature, including microkinetic energy harvesting systems utilizing frequencies occurring in human motion to harvest energy [189], powering wearables with solar energy harvesting [190], self-powering smart fabric [191] and wireless power transfer for implantables [192], [193]. Considering the increasing power requirement of the IoT devices, some researchers have proposed green energy harvesting solutions for IoT devices [194].…”

Section: Challenges and Future Research Directionsmentioning

confidence: 99%

Towards Energy Efficiency in the Internet of Wearable Things: A Systematic Review

et al. 2020

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Personal mobile devices such as smartwatches, smart jewelry, and smart clothes have launched a new trend in the Internet of Things (IoT) era, namely the Internet of Wearable Things (IoWT). These wearables are small IoT devices capable of sensing, storing, processing, and exchanging data to assist users by improving their everyday life tasks through various applications. However, the IoWT has also brought new challenges for the research community to address such as increasing demand for enhanced computational power, better communication capabilities, improved security and privacy features, reduced form factor, minimal weight, and better comfort. Most wearables are battery-powered devices that need to be recharged-therefore, the limited battery life remains the bottleneck leading to the need to enhance the energy efficiency of wearables, thus, becoming an active research area. This paper presents a survey of energy-efficient solutions proposed for diverse IoWT applications by following the systematic literature review method. The available techniques published from 2010 to 2020 are scrutinized, and the taxonomy of the available solutions is presented based on the targeted application area. Moreover, a comprehensive qualitative analysis compares the proposed studies in each application area in terms of their advantages, disadvantages, and main contributions. Furthermore, a list of the most significant performance parameters is provided. A more in-depth discussion of the main techniques to enhance wearables' energy efficiency is presented by highlighting the trade-offs involved. Finally, some potential future research directions are highlighted.

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Section: Challenges and Future Research Directionsmentioning

confidence: 99%

Towards Energy Efficiency in the Internet of Wearable Things: A Systematic Review

et al. 2020

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“…Two methods are employed for preparing stretchable devices with textile structures: one is a relatively simple method of preparing stretchable supercapacitors by depositing active materials on the fabric substrate through dip coating or screen printing. [107,114,117] The other involves manufacturing fibrous supercapacitors and then weaving them into the fabric. [118,123] The stretch rate of the textile structure ranges from 20% to 120% ( Table 2).…”

Section: %mentioning

confidence: 99%

Stretchable Supercapacitors: From Materials and Structures to Devices

Shao

Chen

et al. 2020

Small Methods

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Stretchable supercapacitors have received widespread attention due to their potential applications in wearable electronics and health monitoring. Stretchable supercapacitors not only possess advantages such as high power density, long cycle life, safety, and low cost of conventional supercapacitors but also have excellent flexibility and stretchability, which make them well integrated with other wearable systems. In this review, various strategies to fabricate stretchable supercapacitors are focused. The preparation methods for stretchable electrodes/devices in the literature are carefully classified and analyzed. Three strategies for preparing stretchable electrodes/devices are summarized in detail—the design of elastic polymer substrates, stretchable electrode structures, and composite electrodes combined with elastic polymers and stretchable structures. Meanwhile, the interface problem of electrodes/devices in the stretching process is studied in depth. The research progress of multifunctional stretchable supercapacitors is also introduced. Finally, challenges and possible solutions that still need to be addressed in the future development of stretchable supercapacitors are highlighted and prospected. This review comprehensively discusses the latest research progress in the field of stretchable supercapacitors and systematically elucidates the electrochemical and mechanical properties of these devices, hoping to improve the roadmap for scientists and engineers to develop supercapacitors with high electrochemical performance and good stretchability.

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“…Electronic textiles (e-textiles) have received significant attention for the purpose of achieving imperceptible biological information sensing on the human body [1][2][3][4][5][6][7][8][9][10][11]. For e-textiles, the formation of flexible conductive patterns that have low initial resistance and minimal resistance increase due to tensile deformation is a crucial challenge.…”

Section: Introductionmentioning

confidence: 99%

Resistance Reduction of Conductive Patterns Printed on Textile by Curing Shrinkage of Passivation Layers

2020

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Directly printing conductive ink on textiles is simple and compatible with the conventional electronics manufacturing process. However, the conductive patterns thus formed often show high initial resistance and significant resistance increase due to tensile deformation. Achieving conductive patterns with low initial resistance and reduced deformation-induced resistance increase is a significant challenge in the field of electronic textiles (e-textiles). In this study, the passivation layers printed on conductive patterns, which are necessary for practical use, were examined as a possible solution. Specifically, the reduction of the initial resistance and deformation-induced resistance increase, caused by the curing shrinkage of passivation layers, were theoretically and experimentally investigated. In the theoretical analysis, to clarify the mechanism of the reduction of deformation-induced resistance increase, crack propagation in conductive patterns was analyzed. In the experiments, conductive patterns with and without shrinking passivation layers (polydimethylsiloxane) cured at temperatures of 20–120 °C were prepared, and the initial resistances and resistance increases due to cyclic tensile and washing in each case were compared. As a result, the initial resistance was reduced further by the formation of shrinking passivation layers cured at higher temperatures, and reduced to 0.45 times when the curing temperature was 120 °C. The cyclic tensile and washing tests confirmed a 0.48 and a 0.011 times reduction of resistance change rate after the 100th elongation cycle (10% in elongation rate) and the 10th washing cycle, respectively, by comparing the samples with and without shrinking passivation layers cured at 120 °C.

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Large-scale waterproof and stretchable textile-integrated laser- printed graphene energy storages

Cited by 46 publications

References 33 publications

Towards Energy Efficiency in the Internet of Wearable Things: A Systematic Review

Towards Energy Efficiency in the Internet of Wearable Things: A Systematic Review

Stretchable Supercapacitors: From Materials and Structures to Devices

Resistance Reduction of Conductive Patterns Printed on Textile by Curing Shrinkage of Passivation Layers

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