Combination of chemical foaming strategy and laser-induced graphene technology for enhanced paper-based microsupercapacitor

Deuermeier

ACS Appl. Mater. Interfaces

et al. 2022

Laser irradiation of polymeric materials has drawn great attention as a fast, simple, and cost-effective method for the formation of porous graphene films that can be subsequently fabricated into low-cost and flexible electronic and energy-storage devices. In this work, we report a systematic study of the formation of laser-induced graphene (LIG) with sheet resistances as low as 9.4 Ω/sq on parylene-C ultrathin membranes under a CO2 infrared laser. Raman analysis proved the formation of the multilayered graphenic material, with I D/I G and I 2D/I G peak ratios of 0.42 and 0.65, respectively. As a proof of concept, parylene-C LIG was used as the electrode material for the fabrication of ultrathin, solid-state microsupercapacitors (MSCs) via a one-step, scalable, and cost-effective approach, aiming at future flexible and wearable applications. The produced LIG-MSC on parylene-C exhibited good electrochemical behavior, with a specific capacitance of 1.66 mF/cm2 and an excellent cycling stability of 96% after 10 000 cycles (0.5 mA/cm2). This work allows one to further extend the knowledge in LIG processes, widening the group of precursor materials as well as promoting future applications. Furthermore, it reinforces the potential of parylene-C as a key material for next-generation biocompatible and flexible electronic devices.

Section: Resultsmentioning

confidence: 94%

Biocompatible Parylene-C Laser-Induced Graphene Electrodes for Microsupercapacitor Applications

Deuermeier

ACS Appl. Mater. Interfaces

et al. 2022

“…25,42,43 Efficient LIG conversion is also enabled by efficient photochemical and nonlinear absorption, which provides better electrical conductivity with lower laser power. As a result, our femtosecond-LIG offers superior graphene quality with a sheet resistance of 2.86 Ω/□ over the previously reported LIGs realized by CW lasers; Kevlar-LIG patterned by 10.6 μm 8.0 W CO 2 laser provided the sheet resistance of 300 Ω/□, 44 and additional phosphorus-doping with 10.6 μm 6.4 W CO 2 laser could improve the sheet resistance of LIG to ∼4.0 Ω/□, 45 and the 10.6 μm 7.0 W CO 2 laser could realize ∼15 Ω/□ value of sheet resistance of LIG from aramid paper 46 (Table S2). Additionally, the line width is decreased to 28.2 μm with a power of 1.5 W and a scanning speed of 150 mm/s under the focusing spot size of 70.95 μm due to the nonthermal machining of ultrashort pulses (Figure S10 and Table S3).…”

Section: Resultsmentioning

confidence: 99%

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

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.

ACS Appl. Mater. Interfaces

“…This method enables fast patterning and is suitable for integrated circuits, fulfilling the voltage requirements of various applications. Lu et al 75 explored the potential of chemical foaming and LIG technology to enhance the capacitance of p-MSCs (Figure 5d). By applying a chemical foaming agent to commercial aramid paper, they significantly improved the MSC's performance, achieving higher capacitance, reduced electrochemical impedance, and superior cycle performance compared to unmodified devices.…”

Section: Recent P-msc Advancementsmentioning

confidence: 99%

Recent Progress and Challenges in Paper-Based Microsupercapacitors for Flexible Electronics: A Comprehensive Review

Kumar,

Lee,

Park

2024

Recent advances in paper-based microsupercapacitors (p-MSCs) have attracted significant attention due to their potential as substrates for flexible electronics. This review summarizes progress in the field of p-MSCs, discussing their challenges and prospects. It covers various aspects, including the fundamental characteristics of paper, the modification of paper with functional materials, and different methods for device fabrication. The review critically analyzes recent advancements, materials, and fabrication techniques for p-MSCs, exploring their potential applications and benefits, such as flexibility, costeffectiveness, and sustainability. Additionally, this review highlights gaps in current research, guiding future investigations and innovations in the field. It provides an overview of the current state of p-MSCs and offers valuable insights for researchers and professionals in the field. The critical analysis and discussion presented herein offer a roadmap for the future development of p-MSCs and their potential impact on the domain of flexible electronics.