2D Chemistry: Chemical Control of Graphene Derivatization

Matochová, Dagmar; Medveď, Miroslav; Bakandritsos, Aristides; Steklý, Tomáš; Zbořil, Radek; Otyepka, Michal

doi:10.1021/acs.jpclett.8b01596

Cited by 48 publications

(53 citation statements)

References 53 publications

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“…The oxo‐addends are tentatively immobilized onto segregated carbon, which isolates intact nanometer‐scale graphene domains into small islands . The existence of surface oxo‐groups has profound impacts on improving its hydrophilicity, chemical reactivity, catalytic activity, and optical properties, whereas the effect is detrimental for the electrical conductivity . Therefore, to enhance the electrical performance of GO or oxo‐G, extensive researches were conducted on the deoxygenation of oxo‐addends .…”

Section: Figurementioning

confidence: 99%

Room‐Temperature Transport Properties of Graphene with Defects Derived from Oxo‐Graphene

Wang

Yao

Eigler

2020

Chemistry A European J

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In recent years, graphene oxide has been considered as as oluble precursor of graphene for electronic applications. However,t he performance lags behind that of graphene due to lattice defects. Here, the relation between the density of defects in the range of 0.2 %a nd 1.5 %a nd the transport properties is quantitatively studied. Therefore, the related flakes of monolayers of graphene were prepared from oxo-functionalized graphene (oxo-G). The morphologic structure of oxo-G was imaged by atomicf orce microscopy (AFM) and scanning tunneling microscopy (STM). Field-effect mobility values were determined to range between 0.3 cm 2 V À1 s À1 and 33.2 cm 2 V À1 s À1 ,w hich were inverselyp roportionalt ot he density of defects. These resultsp rovide the first quantitative description of the density of defects and transport properties, which plays an important role for potentiala pplications.Chemically modified graphene, such as graphene oxide (GO) or oxo-functionalized graphene (oxo-G), has received considerable interests for electronic, [1] optoelectronic, [2] biological [3] and chemicals ensing [4] applications due to its physicochemical phenomena, including its tunable bandgap, [5] diverse luminescence behaviors, [6] biological compatibility [7] and the ability to modify the surfacec ovalently and non-covalently. [8] In contrast to pristine graphene with carbona toms arranged into at wodimensional hexagonal lattice, oxo-G consists of abundant sp 3hybridized carbon atoms, which are covalently bound to oxogroups,m ainly hydroxyl and epoxy groups. [9] The sp 3 -portioni s between 4% and6 0%,w ith variable functionality. [10] The oxoaddends are tentatively immobilizedo nto segregatedc arbon, which isolates intact nanometer-scale graphene domains into small islands. [11] The existence of surface oxo-groups has profound impacts on improving its hydrophilicity, [12] chemicalreactivity, [13] catalytic activity, [14] and optical properties, [2a] whereas the effect is detrimental for the electrical conductivity. [15] Therefore, to enhancet he electrical performance of GO or oxo-G, extensiver esearches were conducted on the deoxygenation of oxo-addends. [16] In this regard, thermal processing provides a simple and versatile method for carbonization, however,w ithout ac arbon source, more lattice defects, such as few-atoms vacancies and nanometer-scale holes, are introduced due to thermald isproportionation along with CO 2 formation. [17] Duringt he oxidative synthesis of GO and oxo-G, defects are introducedi nto the carbon framework. [10a] They cannot be healedo ut by simple chemical reduction although oxo-addendsa re reductively defunctionalized from the carbon lattice by ac hemical reductant. [18] The defect concentrationi nG Oo r oxo-G can be determined by Ramans pectroscopy after chemical reduction and typically varies from 0.001 %t o2%. [19] We demonstrated that the mobility of chargec arriers of reduced oxo-G with ad ensity of defects as low as 0.02 %i se xceeding 1000 cm 2 V À1 s À1 ,m easureda t1 .6 Ki na...

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Section: Figurementioning

confidence: 99%

Room‐Temperature Transport Properties of Graphene with Defects Derived from Oxo‐Graphene

Wang

Yao

Eigler

2020

Chemistry A European J

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“…High thermal conductivity (5000 w/mk) 4 high carrier mobility about (200,000 cm 2 v −1 s −1 ) 5 [18,19]. Graphene bounds together to form graphite lattice crystals which is arranged in the form of highly ordered pyro-lytic graphite (HOPG) [20]. In the outer shell of carbon atom there are four electrons, three sigma ( ) and one pie ( ) bond for graphene.…”

Section: Introductionmentioning

confidence: 99%

A review on graphene based transition metal oxide composites and its application towards supercapacitor electrodes

Hussain

Ihrar

et al. 2020

SN Appl. Sci.

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Two-dimensional (2D) graphene and its outstanding properties such as, enormous conductivities, mechanical strength, optical and electrical properties brought it one of the most studied materials for the production of energy using renewable resources. The composites of graphene with the same morphological materials such as layered transition metal oxides will be the most aspiring combination to boost their conducting, optoelectronic and mechanical properties. Furthermore, the transition metal chalcogenides materials attracted significant attention due to their atomically thin layers and enormous optical, conducting and electrical properties. The layered materials offer mostly atomically thin 2D plane to the charge carrier with superior conducting properties. The thickness at atomic level, band gap, spin orbit coupling electronic and optoelectronics properties of transition metal dichalcogenides makes them one of the promising entities in energy harvesting technologies. The review suggests some strategies to improve the transition metals-composites stability conducting properties to be tailored in various applications.

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“…However, additional vibrations are observed in JFG‐OH spectra together with a reduction in intensity for the C‐F stretching bands. More specifically, the bands located between 1635–1678 cm −1 corresponding to skeletal vibrations of graphitic regions suggest a reductive defluorination of FG and establishment of C sp 2 network . The bands between 1032–1100 cm −1 can be attributed to C−O stretching vibrations, while ‐OH stretching and bending vibrations appear in the 3300–3500 cm −1 and 1330–1420 cm −1 regions, respectively .…”

Section: Resultsmentioning

confidence: 94%

One‐Step Synthesis of Janus Fluorographene Derivatives

Kouloumpis

Chronopoulos

Potsi

et al. 2020

Chemistry A European J

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Fluorographene, at wo-dimensional derivativeo f graphene, is an excellent starting materialf or the synthesis of graphene derivatives. In this work, ao ne-step, substratefree method for the asymmetricf unctionalization of fluorographene layers with hydroxyl groups by af acile nucleophilic substitution reactioni sr eported. Such ac hemical modification occurs in ab iphasic aqueous-organic system under mild conditions, leading to Janus graphene nanosheets functionalized by hydroxyl groups on one side and retaining fluorine atoms on the other.T he reported experimental route paves the way for two-dimensional bifacial graphene templates, thus broadening the application potential of graphene materials.

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2D Chemistry: Chemical Control of Graphene Derivatization

Cited by 48 publications

References 53 publications

Room‐Temperature Transport Properties of Graphene with Defects Derived from Oxo‐Graphene

Room‐Temperature Transport Properties of Graphene with Defects Derived from Oxo‐Graphene

A review on graphene based transition metal oxide composites and its application towards supercapacitor electrodes

One‐Step Synthesis of Janus Fluorographene Derivatives

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