The Nature of Metastable AA’ Graphite: Low Dimensional Nano- and Single-Crystalline Forms

Lee, Jae Kap; Kim, Jin Gyu; Hembram, K. P. S. S.; Kim, Yong Il; Min, Bok Ki; Park, Yeseul; Lee, Jeon Kook; Moon, Dong Ju; Lee, Wooyoung; Lee, Sang Gil

doi:10.1038/srep39624

Cited by 44 publications

(26 citation statements)

References 34 publications

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“…The FFT taken from CNBs (Figure 1I) shows the presence of two rings of reflections at 0.21 and 0.35 nm, again corresponding to the (100) plane of graphene sheets and the interlayer spacing of the stacked graphene sheets, respectively. 27,28 Chemical evolution of the samples that occurs during the transformation from CDs to CNRs and from CNRs to CNBs was investigated by energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). EDS profiles of all three samples reveal the presence of C, O, N, and S (Figure 2A and B), with atomic contents of these four elements in CDs being 45.5%, 31.7%, 21.5%, and 1.2%, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…From the AFM image, the height profile of the CNRs ranges from 7 to 20 nm (Figure C and Fiogure S2), which means they are in a form of short cylinders. The fast Fourier transform (FFT) taken from the nanoroll structures (Figure D, inset) reveals the presence of two rings of reflections corresponding to 0.21 and 0.35 nm, which are attributed to the (100) plane of graphene sheets, and the interlayer spacing in the stacked graphene sheets, respectively. , HRTEM images of the CNRs (Figure E,F) show rolled structures with an interlayer spacing of 0.35 nm.…”

Section: Results and Discussionmentioning

confidence: 99%

“…After extending the irradiation time to 30 min, all the layered cylinders of CNRs transform into CNBs with a width ranging from 7 to 20 nm and lengths reaching hundreds of nanometers (Figure G,H). The FFT taken from CNBs (Figure I) shows the presence of two rings of reflections at 0.21 and 0.35 nm, again corresponding to the (100) plane of graphene sheets and the interlayer spacing of the stacked graphene sheets, respectively. , …”

Section: Results and Discussionmentioning

confidence: 99%

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Morphology Control of Luminescent Carbon Nanomaterials: From Dots to Rolls and Belts

Liang¹,

Liu²,

Li³

et al. 2020

ACS Nano

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In this work, we report a successful extension of the family of light-emitting colloidal carbon nanostructures to a number of different shapes and morphologies, namely, carbon nanorolls (CNRs) and carbon nanobelts (CNBs). Near infrared (NIR)-emissive CNRs were synthesized via a solvothermal fusion of carbon dots (CDs) triggered by a dehydration process of their surface functional groups. They appear in a form of short cylinders, with diameters ranging from 20 to 40 nm and cylinder lengths ranging from 7 to 20 nm. In ethanol solution, CNRs have a maximum absorption peak at 665 nm and a NIR emission band extending from 650 to 800 nm, with a photoluminescence quantum yield of 9.2%. Intriguingly, the rolled structure of CNRs can be uncoiled under 655 nm laser irradiation (power density 1 W•cm −2 ) of their solution in ethanol, forming CNBs with a width of 7−20 nm and lengths reaching several hundreds of nanometers, which is accompanied by a considerably decreased absorption band at 665 nm and a decreased NIR emission. This unfolding is ascribed to the decrease of the strength of interlayer hydrogen bonding, owing to the photothermally induced dehydration and further carbonization of the CNRs. Alongside the decreased NIR emission, CNBs exhibit enhanced green and red emissions under UV and green light excitation, respectively, which allows us to demonstrate multiple-level luminescence encryptions on a paper stamped with CNR-and CNB-inks.

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Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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Morphology Control of Luminescent Carbon Nanomaterials: From Dots to Rolls and Belts

Liang¹,

Liu²,

Li³

et al. 2020

ACS Nano

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“…Chemical vapor deposition (CVD) is one of the most popular synthesis method for the growth of SLG using metal catalysts [14][15][16] . However, in the case of BLG, only the most energetically stable AB-stacked (also called Bernal-stacked) BLG has been mainly obtained by CVD [17][18][19] . Thus, the synthesis of BLGs with controlled stacking angles by CVD method has been limited.…”

Section: Introductionmentioning

confidence: 99%

Specific stacking angles of bilayer graphene grown on atomic-flat and -stepped Cu surfaces

Cho¹,

Park²,

Kim³

et al. 2020

npj 2D Mater Appl

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Bilayer graphene (BLG) exhibits unique properties depending on a stacking angle between the two layers of graphene. Although it has been known that BLGs having stacking angles of 0° and 30° can be obtained by chemical vapor deposition (CVD), not much is known yet about the effect of copper (Cu) surface on the decision of stacking angle, through which further fine control of the stacking angle could be possible. Here, we report that the crystal plane of Cu catalyst plays a critical role in the selection of the stacking angle of BLG, and provide experimental and computational evidence that an atomic-flat Cu (111) surface generates BLGs having 0° and 30° of stacking angle, while atomic-stepped Cu (311) and Cu (110) surfaces mainly produce small stacking angle BLGs with 3–5° of stacking angle as a major product by CVD.

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“…For the later, the layers adjacent to the intercalated F 2 are AA-stacked. While AB-stacking for bilayer graphene is considered to be more stable, there are experimental evidences showing stable synthesis of AA-stacked BLG [42][43][44][45][46]. More importantly, the electronic structure calculations predict the formation of a suspended ferromagnetically coupled 2D spin lattice out of these pseudoatomized fluorine layer as shown in Fig.…”

Section: Introductionmentioning

confidence: 97%

Fluorine Intercalated Graphene: Formation of a 2D Spin Lattice through Pseudoatomization

Mishra,

Yadav,

Kanhere

et al. 2020

Preprint

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A suspended layer made up of ferromagnetically ordered spins could be created between two mono/multilayer graphene through intercalation. Stability and electronic structure studies show that, when fluorine molecules are intercalated between two mono/multilayer graphene, their bonds get stretched enough (∼ 1.9−2.0 Å) to weaken their molecular singlet eigenstate. Geometrically, these stretched molecules form a pseudoatomized fluorine layer by maintaining a van der Waals separation of ∼ 2.6 Å from the adjacent carbon layers. As there is a significant charge transfer from the adjacent carbon layers to the fluorine layers, a mixture of triplet and doublet states stabilize to induce local spin-moments at each fluorine sites and in turn form a suspended 2D spin lattice. The spins of this lattice align ferromagnetically with nearest neighbour coupling strength as large as ∼ 100 meV. Our finite temperature ab initio molecular dynamics study reveals that the intercalated system can be stabilized up to a temperature of 100 K with an average magnetic moment of ∼ 0.6 µB/F. However, if the graphene layers can be held fixed, the room temperature stability of such a system is feasible.

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The Nature of Metastable AA’ Graphite: Low Dimensional Nano- and Single-Crystalline Forms

Cited by 44 publications

References 34 publications

Morphology Control of Luminescent Carbon Nanomaterials: From Dots to Rolls and Belts

Morphology Control of Luminescent Carbon Nanomaterials: From Dots to Rolls and Belts

Specific stacking angles of bilayer graphene grown on atomic-flat and -stepped Cu surfaces

Fluorine Intercalated Graphene: Formation of a 2D Spin Lattice through Pseudoatomization

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