Laser-reduced graphene-oxide/ferrocene: a 3-D redox-active composite for supercapacitor electrodes

Borenstein, Arie; Strauß, Volker; Kowal, Matthew; Yoonessi, Mitra; Muni, Mit; Anderson, Mackenzie; Kaner, Richard B.

doi:10.1039/c8ta08249a

Cited by 44 publications

(35 citation statements)

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“…Detailed structural characterization and reaction mechanisms of the laser-reduction process of GO or CNDs have been published previously. 22,23,26,27 In all our experiments the same laser power was used, and it was found that the investigated samples react differently upon laser impact. The precursor films with higher CND mass fractions are more stable against laser-induced evaporation ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…1. [23][24][25][26] To ensure equal mass loading throughout the samples on the substrates prior to the laser-reduction step, the amount of applied solution was adjusted accordingly (Table 1). Solutions were either prepared in H 2 O or in a 1 : 1 mixture of N-methyl-2pyrrolidone (NMP) and iso-propanol (i-PrOH) (NMP/i-PrOH (1 : 1 v/v)) to produce uniform films.…”

Section: Resultsmentioning

confidence: 99%

“…[17][18][19][20] A particularly interesting approach is the direct laserassisted conversion of graphene oxide (GO) or carbon nanodots (CNDs). [21][22][23][24][25][26][27] In the past years, laser-reduction of GO has been studied as a versatile method to fabricate and micropattern nanoelectronic devices. 28 Laser-reduced GO is composed of randomly oriented single graphene sheets that are partially stacked with specific surface areas (SSA) of 800-1500 m 2 g −1 .…”

Section: Introductionmentioning

confidence: 99%

“…28 Laser-reduced GO is composed of randomly oriented single graphene sheets that are partially stacked with specific surface areas (SSA) of 800-1500 m 2 g −1 . 26,27 On the other hand, laser-reduced CNDs form a porous material with a more bubble-like appearance featuring lower SSAs of ∼230 m 2 g −1 . 23,24 Despite the low surface area, the benefits of CNDs or reduced CNDs, in particular, are higher electrical conductivity and faster frequency response in the final electrodes.…”

Section: Introductionmentioning

confidence: 99%

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Patching laser-reduced graphene oxide with carbon nanodots

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Patching laser-reduced graphene oxide with carbon nanodots

et al. 2019

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“…The de‐oxidation process separated the graphene sheets, so they were exposed rather than being stacked one on top of the other. The product of this method was thoroughly studied in previous papers . Some of these data including a few physical properties of the product, are presented in the Supporting Information in Table S1 and Figure S1.…”

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 Fabrication of Graphene‐Based Flexible Electronics

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Recent years have witnessed the rise of graphene and its applications in various electronic devices. Specifically, featuring excellent flexibility, transparency, conductivity, and mechanical robustness, graphene has emerged as a versatile material for flexible electronics. In the past decade, facilitated by various laser processing technologies, including the laser‐treatment‐induced photoreduction of graphene oxides, flexible patterning, hierarchical structuring, heteroatom doping, controllable thinning, etching, and shock of graphene, along with laser‐induced graphene on polyimide, graphene has found broad applications in a wide range of electronic devices, such as power generators, supercapacitors, optoelectronic devices, sensors, and actuators. Here, the recent advancements in the laser fabrication of graphene‐based flexible electronic devices are comprehensively summarized. The various laser fabrication technologies that have been employed for the preparation, processing, and modification of graphene and its derivatives are reviewed. A thorough overview of typical laser‐enabled flexible electronic devices that are based on various graphene sources is presented. With the rapid progress that has been made in the research on graphene preparation methodologies and laser micronanofabrication technologies, graphene‐based electronics may soon undergo fast development.

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Laser-reduced graphene-oxide/ferrocene: a 3-D redox-active composite for supercapacitor electrodes

Abstract: Supercapacitors are energy storage and conversion devices that display high power.

Cited by 44 publications

References 36 publications

Patching laser-reduced graphene oxide with carbon nanodots

Patching laser-reduced graphene oxide with carbon nanodots

Laser‐Assisted Lattice Recovery of Graphene by Carbon Nanodot Incorporation

Laser Fabrication of Graphene‐Based Flexible Electronics

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