Attachable micropseudocapacitors using highly swollen laser-induced-graphene electrodes

Lee, Yeong A.; Lim, Joel Choon Wee; Cho, Younghyun; Lee, Hyub; Park, Sangbaek; Lee, Go-Woon; Yoo, Chung‐Yul; Park, Sang Hyun; Murukeshan, Vadakke Matham; Kim, Seungchul; Kim, Young‐Jin; Yoon, Ho Kyoung

doi:10.1016/j.cej.2019.123972

Cited by 18 publications

(9 citation statements)

References 61 publications

(81 reference statements)

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“…This entire process occurs at an extremely short time scale of ∼500 ps. This ultrafast formation of LIG has been also reported by other groups in refs − . − Therefore, femtosecond lasers are one of the promising tools for the precise temperature control over thousands of Kelvin levels within the picosecond time scales. In contrast to continuous-wave (CW) or long-pulse lasers, this approach effectively mitigates the energy overflow, thereby minimizing material ablation and preventing undesirable damage to laser-induced graphene.…”

Section: Resultssupporting

confidence: 72%

Multimodal E-Textile Enabled by One-Step Maskless Patterning of Femtosecond-Laser-Induced Graphene on Nonwoven, Knit, and Woven Textiles

Yang,

Nam,

et al. 2023

ACS Nano

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Personal wearable devices are considered important in advanced healthcare, military, and sports applications. Among them, e-textiles are the best candidates because of their intrinsic conformability without any additional device installation. However, e-textile manufacturing to date has a high process complexity and low design flexibility. Here, we report the direct laser writing of e-textiles by converting raw Kevlar textiles to electrically conductive laser-induced graphene (LIG) via femtosecond laser pulses in ambient air. The resulting LIG has high electrical conductivity and chemical reliability with a low sheet resistance of 2.86 Ω/□. Wearable multimodal e-textile sensors and supercapacitors are realized on different types of Kevlar textiles, including nonwoven, knit, and woven structures, by considering their structural textile characteristics. The nonwoven textile exhibits high mechanical stability, making it suitable for applications in temperature sensors and micro-supercapacitors. On the other hand, the knit textile possesses inherent spring-like stretchability, enabling its use in the fabrication of strain sensors for human motion detection. Additionally, the woven textile offers special sensitive pressure-sensing networks between the warp and weft parts, making it suitable for the fabrication of bending sensors used in detecting human voices. This direct laser synthesis of arbitrarily patterned LIGs from various textile structures could result in the facile realization of wearable electronic sensors and energy storage.

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Section: Resultssupporting

confidence: 72%

Multimodal E-Textile Enabled by One-Step Maskless Patterning of Femtosecond-Laser-Induced Graphene on Nonwoven, Knit, and Woven Textiles

Yang,

Nam,

et al. 2023

ACS Nano

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“…We noticed that graphene in the GNSC has a high specific volumetric capacitance, which shows the improvement of the specific capacitance of the graphene electrode with the miniaturization of the electrode gap. Figure b shows a comparison of the specific volumetric capacitance of the graphene electrode in the prepared GNSC and those of some other laser-fabricated graphene supercapacitors. ,,,− The microscale entire size and nanoscale thickness of the GNSC improved its integration capability. Meanwhile, a nanoscale supercapacitor also has improved specific volumetric capacitance.…”

Section: Resultsmentioning

confidence: 99%

Femtosecond Laser Bessel Beam Fabrication of a Supercapacitor with a Nanoscale Electrode Gap for High Specific Volumetric Capacitance

Guo

Yan

Jiang

et al. 2022

ACS Appl. Mater. Interfaces

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Supercapacitors are widely used in electronic systems as energy storage devices. The fabrication of a miniaturized supercapacitor with high specific capacitance has attracted much attention in recent years. Here, we propose a new method to fabricate supercapacitors with a nanoscale electrode gap by using a femtosecond laser. The original femtosecond laser was converted to a nondiffraction Bessel light field with nanoscale beam width and microscale focal depth. Nanoscale processing precision was achieved by regulating the Bessel beam. We fabricated graphene supercapacitors with different electrode gap widths (varying from the microscale to the nanoscale) using this method. Supercapacitors fabricated by this method have advantages in both size miniaturization (electrode gap width down to ∼500 nm) and electrochemical performance improvement (a specific volumetric capacitance of 195 F/cm 3 ). This work demonstrates that the femtosecond laser Bessel beam processing method provides a reliable pathway to fabricate miniaturized supercapacitors with high specific capacitance and other nanoscale electronic devices.

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“…Pulse lasers can be divided into microseconds [73], nanoseconds [74,75], picoseconds [76,77] and femtosecond [78,79] scales according to their pulse durations. Ultrafast pulse lasers were considered as the more versatile laser machining tool [80], in which the resulting picosecond [81] and femtosecond [82] laser pulses are several orders of magnitude shorter than traditional nanosecond laser. Moreover, the derived thermal effect becomes less noticeable, which can meet the desire of high resolution in the micromachining [83].…”

Section: Laser With Different Pulsesmentioning

confidence: 99%

Laser fabrication of functional micro-supercapacitors

Wang

Yang

2021

Journal of Energy Chemistry

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Attachable micropseudocapacitors using highly swollen laser-induced-graphene electrodes

Cited by 18 publications

References 61 publications

Multimodal E-Textile Enabled by One-Step Maskless Patterning of Femtosecond-Laser-Induced Graphene on Nonwoven, Knit, and Woven Textiles

Multimodal E-Textile Enabled by One-Step Maskless Patterning of Femtosecond-Laser-Induced Graphene on Nonwoven, Knit, and Woven Textiles

Femtosecond Laser Bessel Beam Fabrication of a Supercapacitor with a Nanoscale Electrode Gap for High Specific Volumetric Capacitance

Laser fabrication of functional micro-supercapacitors

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