Scalable and controlled creation of nanoholes in graphene by microwave-assisted chemical etching for improved electrochemical properties

Wang, Dini; Dai, Rui; Zhang, Xing; Liu, Lei; Lu, Yongfeng; Wang, Yan; Liao, Yiliang; Nian, Qiong

doi:10.1016/j.carbon.2020.01.076

Cited by 35 publications

(29 citation statements)

References 59 publications

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“…92 Wang et al used a microwave reactor to produce HGO. 93 Initially, GO aqueous solution was prepared from graphite akes using an improved Hummers' method. 94 The GO solution was then mixed with H 2 O 2 , kept in a reaction tube, and irradiated in a microwave reactor at a constant power of 50 W for 45-180 s. The solution was cooled and residual H 2 O 2 was removed via centrifugation.…”

Section: Chemical: Chemical Etching Methodsmentioning

confidence: 99%

“…Thus, by comparing the intensity, their relative positions, and the FWHM of the peaks, various structural properties of the synthesized HG can be evaluated, as demonstrated by various works. 59,62,63,93,121 Apart from Raman spectroscopy, electron microscopy tools such as SEM and TEM can be used for the assessment of the morphology or to observe the porous nature of the HG materials. On the one hand, SEM can be used for a quick understanding of the material, while TEM can offer intricate information related to the shape, size, or the structural nature of the formed pores in the material.…”

Section: Tools and Techniques To Characterize Hgmentioning

confidence: 99%

“…The rapid synthesis process could be attributed to the in situ heat generation process in the sample (GO sheets) during the microwave irradiation. The increased surface area and ion diffusion in the HGO boosts the electrochemical catalytic activity and displays excellent capacitive performance 93.…”

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confidence: 99%

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Synthesis of holey graphene for advanced nanotechnological applications

et al. 2021

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Section: Chemical: Chemical Etching Methodsmentioning

confidence: 99%

Section: Tools and Techniques To Characterize Hgmentioning

confidence: 99%

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Synthesis of holey graphene for advanced nanotechnological applications

et al. 2021

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“…For example, nanoholes form during the reduction of graphene oxide (GO), which affect the hydrophilicity, rigidity, and affinity for binding with other molecules. [ 11 ] Surface functionalization changes the surface chemistry such as charge and hydrophobicity and thus, the biological behavior and effects. In fact, the interactions of graphene with cells / organisms and the biological recognition processes are largely dependent on the surface.…”

Section: Introductionmentioning

confidence: 99%

Surface Functionalization of Graphene‐Based Materials: Biological Behavior, Toxicology, and Safe‐By‐Design Aspects

et al. 2021

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drug delivery, bioimaging probes, antibacterial agents, and tissue engineering. [2] The advantage of GBMs over other nanomaterials (NMs) in biomedical application is their high specific surface area which allows high density functionalization and drug loading on both sides of the planar structure. [3] The π-conjugated system offers high capacity for GBMs to interact with various organic compounds with aromatic structures through π-π stacking during fabrication of graphene composites or for immobilization of biomolecules such as nucleic acids, peptides, antibodies, or other therapeutic substances. [4] The same properties may also raise concerns regarding the potential risk that GBMs may cause to human health through binding of key signaling molecules for example. GBMs may interact with biomolecules, changing the structure of protein or DNA or induce oxidative damage, and so on. [5] Therefore, prior to the widespread use of GBMs, it is imperative to evaluate their potential risk to environmental and human health and to establish a proactive approach for the safe design of these materials.In a recent review article, Fadeel et al. comprehensively examined the literature on the effects of GBMs on human health and the environment and gave an overview of the state-of-the-art of safety assessment of GBMs, highlighting the importance of The increasing exploitation of graphene-based materials (GBMs) is driven by their unique properties and structures, which ignite the imagination of scientists and engineers. At the same time, the very properties that make them so useful for applications lead to growing concerns regarding their potential impacts on human health and the environment. Since GBMs are inert to reaction, various attempts of surface functionalization are made to make them reactive. Herein, surface functionalization of GBMs, including those intentionally designed for specific applications, as well as those unintentionally acquired (e.g., protein corona formation) from the environment and biota, are reviewed through the lenses of nanotoxicity and design of safe materials (safe-by-design). Uptake and toxicity of functionalized GBMs and the underlying mechanisms are discussed and linked with the surface functionalization. Computational tools that can predict the interaction of GBMs behavior with their toxicity are discussed. A concise framing of current knowledge and key features of GBMs to be controlled for safe and sustainable applications are provided for the community.

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“…A few techniques have been used to fabricate GNMs, including nanosphere lithography [35], nanoimprint lithography [36], block copolymer lithography [13,37], irradiation etching [38,39], atomic force microscopy etching [40], and oxygen reactive ion etching [41,42]. GNMs fabricated with these methods will most likely have structural defects, such as variations in the size and shape of the pores, as well as the pore lattice structure and symmetry.…”

Section: Introductionmentioning

confidence: 99%

Effect of pore-size disorder on the electronic properties of semiconducting graphene nanomeshes

Gamal¹,

Fadlallah²,

Salah³

et al. 2020

Preprint

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Graphene nanomeshes (GNMs) are novel materials that recently raised a lot of interest. They are fabricated by forming a lattice of pores in graphene. Depending on the pore size and pore lattice constant, GNMs can be either semimetallic or semiconducting with a gap large enough (∼ 0.5 eV) to be considered for transistor applications. The fabrication process is bound to produce some structural disorder due to variations in pore sizes. Recent electronic transport measurements in GNM devices (ACS Appl. Mater. Interfaces 10, 10362, 2018) show a degradation of their bandgap in devices having pore-size disorder. It is therefore important to understand the effect of such variability on the electronic properties of semiconducting GNMs. In this work we use the density functional-based tight binding formalism to calculate the electronic properties of GNM structures with different pore sizes, pore densities, and with hydrogen and oxygen pore edge passivations. We find that structural disorder reduces the electronic gap and the carrier group velocity, which may interpret recent transport measurements in GNM devices. Furthermore the trend of the bandgap with structural disorder is not significantly affected by the change in pore edge passivation. Our results show that even with structural disorder, GNMs are still attractive from a transistor device perspective.

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Scalable and controlled creation of nanoholes in graphene by microwave-assisted chemical etching for improved electrochemical properties

Cited by 35 publications

References 59 publications

Synthesis of holey graphene for advanced nanotechnological applications

Synthesis of holey graphene for advanced nanotechnological applications

Surface Functionalization of Graphene‐Based Materials: Biological Behavior, Toxicology, and Safe‐By‐Design Aspects

Effect of pore-size disorder on the electronic properties of semiconducting graphene nanomeshes

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