A protocol for size separation of nanographenes

Matsumoto, Ikuya; Sekiya, Ryo; Haino, Takeharu

doi:10.1039/c9ra07528c

Cited by 29 publications

(34 citation statements)

References 31 publications

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“…XPS, IR spectroscopy, and 13 C NMR spectroscopy have also been employed for the structural characterization of nonfunctionalized NGs. Figure 5 shows examples of the XPS and 13 C NMR spectra of nonfunctionalized NGs prepared by acid‐assisted oxidative cleavage of graphite [45] . The NGs were subjected to size separation by dialysis membranes with five distinct pore sizes (2, 8, 15, 25, and 50 kD).…”

Section: Nonfunctionalized Carbonsmentioning

confidence: 99%

Section: Nonfunctionalized Carbonsmentioning

confidence: 99%

“…Figure 5s hows examples of the XPS and 13 CNMR spectra of nonfunctionalized NGs prepared by acid-assisted oxidative cleavage of graphite. [45] TheN Gs were subjected to size separation by dialysis membranesw ith five distinct pore sizes (2,8,15,25, and 50 kD). The XPS spectra of the respectives ize fractions showedaless-oxidized surface compared with the surfaceo ft he GOs (Figure 2a).…”

mentioning

confidence: 99%

“…Note:t he scales of the XPS spectrao f( a) and (b) are opposite to the scales of the XPS spectra inFigure 2. Reprinted and adapted with permissionf rom Ref [45]…”

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confidence: 99%

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Edge‐Functionalized Nanographenes

Sekiya

Haino

2020

Chemistry A European J

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Section: Nonfunctionalized Carbonsmentioning

confidence: 99%

Section: Nonfunctionalized Carbonsmentioning

confidence: 99%

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confidence: 99%

“…Note:t he scales of the XPS spectrao f( a) and (b) are opposite to the scales of the XPS spectra inFigure 2. Reprinted and adapted with permissionf rom Ref [45]…”

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Edge‐Functionalized Nanographenes

Sekiya

Haino

2020

Chemistry A European J

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“…Nanographenes smaller than the pore size leaked out of the membranes, while larger ones remained inside. [23] These processes offered nanographenes with a narrow lateral size distribution. The evaporation of the aqueous solution outside the membrane offered nanographenes (243 mg).…”

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Self‐Assembly of Nanographenes

2021

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Suitably decorated small aromatic systems can organize stacked structures that display interesting properties arising from their unique morphologies. Although nanographenes produced by top‐down methods have graphitic domains and can in principle be applied for such supramolecular systems, to our knowledge, no such example has been reported thus far. This is partly because of their limited solubility in organic solvents and partly because of their wide lateral size distribution. To realize nanographene‐based supramolecular aggregates, nanographenes carrying alkyl chains with narrow lateral size distributions are employed. We find that the nanographenes undergo self‐assembly and that self‐assembly is regulated by concentration, solvent polarity, temperature, and sonication. Optical measurements and AFM images indicate that stacked structures are possible candidates for aggregates. A molecular mechanics calculation models the interactions in the aggregates. The nanographenes showed concentration‐dependent morphologies on mica, stacked structures at low concentrations and polymer‐like network structures on mica at higher concentrations.

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Electrochromism of Nanographenes in the Near‐Infrared Region

et al. 2022

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Nanographene (NG) is a potential candidate for organic EC materials because of its large πconjugated system, chemical stability, absorption band covering the visible region, and tunable optical properties by postsynthetic modification. We show that NGs carrying redox-active triphenylamine (TPA) units covalently linked to the NG edge function as EC materials in the NIR region. The hybrid materials can be obtained by the installation of TPA units onto the NG edge and display changes in the absorption spectrum in the NIR region extending to a wavelength of over 2000 nm upon one-electron oxidation and reduction at low potentials (< 1.1 V). Time-dependent unrestricted density functional theory calculation of a model NG at the UB3LYP/6-31G(d,p) level of theory suggests that a narrow energy gap between the basal plane and the oxidized TPA unit is responsible for the observed EC function in the NIR region.

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A protocol for size separation of nanographenes

Abstract: Top-down methods are convenient preparative methods for nanographenes, although the products consist of graphene fragments with a broad size distribution. We developed a simple protocol for size separation of nanographenes.

Cited by 29 publications

References 31 publications

Edge‐Functionalized Nanographenes

Edge‐Functionalized Nanographenes

Self‐Assembly of Nanographenes

Electrochromism of Nanographenes in the Near‐Infrared Region

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