Patching laser-reduced graphene oxide with carbon nanodots

Strauß, Volker; Muni, Mit; Borenstein, Arie; Badamdorj, Bolortuya; Heil, Tobias; Kowal, Matthew; Kaner, Richard B.

doi:10.1039/c9nr01719d

Cited by 25 publications

(18 citation statements)

References 40 publications

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“…The pursuit of high SSA from direct laser scribing of organics has significant potential because direct laser scribing is a fast technique that can also be used to fabricate LSG electrodes on metal current collectors without binders. Kaner et al investigated a laser scribed mixture of carbon quantum dots and graphene oxide (Figure 15d) 232. At a carbon quantum dot concentration of 35%, the LSG exhibited the highest SSA around 1000 m 2 g −1 and a specific capacitance of 190 F g −1 .…”

Section: New Porogen Engineering Methodsmentioning

confidence: 99%

“…d) The dependence of SSA, conductivity, the specific capacitance of the obtained LSG on the weight ratio of carbon quantum dots using a CO 2 laser scribing process. Reproduced with permission 232. Copyright 2019, The Royal Society of Chemistry.…”

Section: New Porogen Engineering Methodsmentioning

confidence: 99%

“…Kaner et al investigated a laser scribed mixture of carbon quantum dots and graphene oxide (Figure 15d). [232] At a carbon quantum dot concentration of 35%, the LSG exhibited the highest SSA around 1000 m 2 g −1 and a specific capacitance of 190 F g −1 . Kaner et al also discovered that the performances of commercially activated carbon electrode could be greatly enhanced by laser scribing (Figure 15e).…”

Section: Co 2 Laser Scribingmentioning

confidence: 98%

“…Reproduced with permission. [232] Copyright 2019, The Royal Society of Chemistry. e) The electrochemical behaviors (dependence of areal capacitance and the gravimetric specific capacitance on current density, the electrochemical impedance spectroscopy) of laserscribed activated carbon and activated carbon in acetonitrile electrolytes.…”

Section: Dehalogenation Carbonizationmentioning

confidence: 99%

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Synthesis Strategies of Porous Carbon for Supercapacitor Applications

et al. 2020

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Supercapacitors (SCs) have experienced a significant increase in research activity and commercialization during the past few decades. As the primary and most important electrode active material for commercial SCs, porous carbon is produced at an industrial‐scale through traditional carbonization‐activation strategies. Nevertheless, commercial porous carbon materials have some disadvantages such as high production cost, corrosion of equipment, and emission of toxic gases and byproduct pollutants during production. In recent years, huge efforts have been made to develop novel synthesis strategies for porous carbon materials. This review focuses on the pore formation mechanisms in traditional carbonization‐activation methods, emerging activation methods, template methods, self‐template methods, and novel emerging methods for the synthesis of porous carbons for SCs. Strategies developed so far for the synthesis of porous carbon materials are summarized. The mechanisms and recent advances for each strategy are reviewed. Furthermore, future directions and synthesis strategies for porous carbons are proposed.

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Section: New Porogen Engineering Methodsmentioning

confidence: 99%

Section: New Porogen Engineering Methodsmentioning

confidence: 99%

Section: Co 2 Laser Scribingmentioning

confidence: 98%

Section: Dehalogenation Carbonizationmentioning

confidence: 99%

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Synthesis Strategies of Porous Carbon for Supercapacitor Applications

et al. 2020

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“…A simple and feasible method to obtain mass production of highly oriented graphene is still badly needed . In previous years, a new method for graphene fabrication was presented involving laser or UV reduction of graphene oxide to form a turbostratic 3D graphene . These methods fabricated a flexible 3D structure of graphene where graphene sheets are oriented in different directions with an open lattice.…”

Section: Introductionmentioning

confidence: 99%

Laser‐Assisted Lattice Recovery of Graphene by Carbon Nanodot Incorporation

Borenstein

Strauß

Kowal

et al. 2019

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Producing highly oriented graphene is a major challenge that constrains graphene from fulfilling its full potential in technological applications. The exciting properties of graphene are impeded in practical bulk materials due to lattice imperfections that hinder charge mobility. A simple method to improve the structural integrity of graphene by utilizing laser irradiation on a composite of carbon nanodots (CNDs) and 3D graphene is presented. The CNDs attach themselves to defect sites in the graphene sheets and, upon laser‐assisted reduction, patch defects in the carbon lattice. Spectroscopic experiments reveal graphitic structural recovery of up to 43% and electrical conductivity four times larger than the original graphene. The composites are tested as electrodes in electrochemical capacitors and demonstrate extremely fast RC time constant as low as 0.57 ms. Due to their low defect concentrations, the reduced graphene oxide‐carbon nanodot (rGO‐CND) composites frequency response is sufficiently fast to operate as AC line filters, potentially replacing today's electrolytic capacitors. Using this methodology, demonstrated is a novel line filter with one of the fastest capacitive responses ever reported, and an aerial capacitance of 68.8 mF cm−2. This result emphasizes the decisive role of structural integrity for optimizing graphene in electronic applications.

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Laser‐Carbonization – A Powerful Tool for Micro‐Fabrication of Patterned Electronic Carbons

et al. 2023

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Fabricating electronic devices from natural, renewable resources is a common goal in engineering and materials science. In this regard, carbon is of special significance due to its biocompatibility combined with electrical conductivity and electrochemical stability. In microelectronics, however, carbon's device application is often inhibited by tedious and expensive preparation processes and a lack of control over processing and material parameters. Laser‐assisted carbonization is emerging as a tool for the precise and selective synthesis of functional carbon‐based materials for flexible device applications. In contrast to conventional carbonization via in‐furnace pyrolysis, laser‐carbonization is induced photo‐thermally and occurs on the time‐scale of milliseconds. By careful selection of the precursors and process parameters, the properties of this so‐called laser‐patterned carbon (LP‐C) such as porosity, surface polarity, functional groups, degree of graphitization, charge‐carrier structure, etc. can be tuned. In this critical review, a common perspective is generated on laser‐carbonization in the context of general carbonization strategies, fundamentals of laser‐induced materials processing, and flexible electronic applications, like electrodes for sensors, electrocatalysts, energy storage, or antennas. An attempt is made to have equal emphasis on material processing and application aspects such that this emerging technology can be optimally positioned in the broader context of carbon‐based microfabrication.

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Patching laser-reduced graphene oxide with carbon nanodots

Abstract: The performance of electric double layer capacitor (EDLC) electrodes based on 3D-graphene obtained by laser-assisted reduction of graphene oxide (GO) is improved by addition of carbon nanodots (CND) to the GO precursor material.

Cited by 25 publications

References 40 publications

Synthesis Strategies of Porous Carbon for Supercapacitor Applications

Synthesis Strategies of Porous Carbon for Supercapacitor Applications

Laser‐Assisted Lattice Recovery of Graphene by Carbon Nanodot Incorporation

Laser‐Carbonization – A Powerful Tool for Micro‐Fabrication of Patterned Electronic Carbons

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