Chemical-free graphene by unzipping carbon nanotubes using cryo-milling

Tiwary, Chandra Sekhar; Javvaji, Brahmanandam; Kumar, Chandan; Mahapatra, D. Roy; Özden, Şehmus; Ajayan, Pulickel M.

doi:10.1016/j.carbon.2015.03.036

Cited by 38 publications

(15 citation statements)

References 35 publications

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“…Unlike the literature reported cases, ,,,,,− the multi-layered GNRs (MLGNRs) obtained by the developed EF-controlled electric unzipping process were characterized by TEM, as shown in Figure , in relation to the variety of both the concentrations and EF-control, respectively.…”

Section: Resultsmentioning

confidence: 97%

Graphene Nanoribbons from Electrostatic-Force-Controlled Electric Unzipping of Single- and Multi-Walled Carbon Nanotubes

Zheng

Guo

Liang

et al. 2020

ACS Appl. Nano Mater.

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An electrostatic forces (EF)-controlled electric unzipping method was developed for producing graphene nanoribbon (GNR) from both single- (SWCNT) and multi-walled carbon nanotubes (MWCNT). Experimentally, an electrostatic generator was employed by taking its two electrodes with opposite charges to alternatively link to the metal vessel and the CNT/water solution to form two oppositely electric cycles corresponding to the EF in enhancement or reduction, respectively. Transmission electron microscopy images showed that this applied method can unzip both the SWCNT and MWCNT into relative GNRs. During the EF-controlled electric unzipping process, the concentration increases and EF-controlled in reduction model can produce GNRs with enhanced width and quality.

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Section: Resultsmentioning

confidence: 97%

Graphene Nanoribbons from Electrostatic-Force-Controlled Electric Unzipping of Single- and Multi-Walled Carbon Nanotubes

Zheng

Guo

Liang

et al. 2020

ACS Appl. Nano Mater.

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“…The CNTs frequently used for graphene synthesis are multiwalled CNTs (MWCNTs), which are comprised of several concentric graphene cylinders and thus can have diameters of up to 150 nm [214]. Various methods are available to unzip CNTs, such as the microwave CVD [215], cryo-milling [216], and chemical treatment followed by thermal reduction [217], among others.…”

Section: Advanced Starting Materials 351 Cntsmentioning

confidence: 99%

“…Hence, they are more suitable to be used as carbonbased supercapacitor devices. Tiwary et al [216] synthesized graphene particles by milling MWCNTs at a cryogenic temperature of 150 K. The high strain exerted by the ball mill causes the MWCNTs to deform and become powder. The powder was then dispersed into a mixture of methyl alcohol and water.…”

Section: Advanced Starting Materials 351 Cntsmentioning

confidence: 99%

Synthesis of graphene: Potential carbon precursors and approaches

Yan

Nashath

Chen

et al. 2020

Nanotechnology Reviews

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Graphene is an advanced carbon functional material with inherent unique properties that make it suitable for a wide range of applications. It can be synthesized through either the top–down approach involving delamination of graphitic materials or the bottom–up approach involving graphene assembly from smaller building units. Common top–down approaches are exfoliation and reduction while bottom–up approaches include chemical vapour deposition, epitaxial growth, and pyrolysis. A range of materials have been successfully used as precursors in various synthesis methods to derive graphene. This review analyses and discusses the suitability of conventional, plant- and animal-derived, chemical, and fossil precursors for graphene synthesis. Together with its associated technical feasibility and economic and environmental impacts, the quality of resultant graphene is critically assessed and discussed. After evaluating the parameters mentioned above, the most appropriate synthesis method for each precursor is identified. While graphite is currently the most common precursor for graphene synthesis, several other precursors have the potential to synthesize graphene of comparable, if not better, quality and yield. Thus, this review provides an overview and insights into identifying the potential of various carbon precursors for large-scale and commercial production of fit-for-purpose graphene for specific applications.

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“…The unzipping is one way to produce uniform GNRs by cutting a CNT, as seen experimentally in Refs. [63][64][65][66][67][68][69][70][71]. These experiments often also report partially-open CNTs, as for example depicted in Fig.…”

Section: B Carbon-based Nanodevicesmentioning

confidence: 99%

Order amidst disorder in semi-regular, tatty, and atypical random nanodevices with locally correlated disorder

Novotny,

Novotný

2020

Preprint

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We make unexpected predictions for the electrical conductance and local density of states (LDOS) of a wide class of semi-regular nanodevices, tatty nanodevices, and nanodevices with atypical but arbitrarily strong disorder. Disorder is disruptive to electron transport, as it causes coherent electron scattering. Nevertheless, we predict a wide class of nanodevices which show order amidst disorder, in that the device Hamiltonians are disordered but when the device is attached to proper leads the LDOS is ordered. These nanodevices also are quantum dragons, as they have complete electron transmission, T (E) = 1 for all electron energies which propagate in the attached leads. We analyze a conventional single-band tight-binding model by NEGF (Non-Equilibrium Green's Function) methods. We provide a recipe to allow extensive disorder in coherent transport through quantum nanodevices based on semi-regular, random, or tatty 2D, 3D, and 2D+3D underlying graphs with arbitrarily strong disorder in the tight-binding parameters, while the nanodevice keeps the desired quantum properties. The tight-binding parameters must be locally correlated to achieve order amidst disorder and T (E) = 1. Consequently, in addition to the known regular examples of armchair single-walled carbon nanotubes and zigzag graphene nanoribbons, we predict a large class of metallic allotropes of carbon with T (E) = 1. We also provide in two different regimes universal scaling analysis for the average transmission, Tave(E), for nanodevices which have nearly the desired quantum properties.

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Chemical-free graphene by unzipping carbon nanotubes using cryo-milling

Cited by 38 publications

References 35 publications

Graphene Nanoribbons from Electrostatic-Force-Controlled Electric Unzipping of Single- and Multi-Walled Carbon Nanotubes

Graphene Nanoribbons from Electrostatic-Force-Controlled Electric Unzipping of Single- and Multi-Walled Carbon Nanotubes

Synthesis of graphene: Potential carbon precursors and approaches

Order amidst disorder in semi-regular, tatty, and atypical random nanodevices with locally correlated disorder

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