Chemical functionalization of graphene sheets by solvothermal reduction of a graphene oxide suspension in N-methyl-2-pyrrolidone

Phạm, Việt Hùng; Cường, Trần Việt; Hur, Seung Hyun; Oh, Eun‐Suok; Kim, Eui Jung; Shin, Eun Woo; Chung, Jin Suk

doi:10.1039/c0jm02790a

Cited by 362 publications

(204 citation statements)

References 38 publications

(76 reference statements)

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“…The G band at 1591 cm −1 is an evidence of the sp 3 and sp 2 hybridization, due to distortion in the crystal structure of the carbon atoms, resulting from oxidation. Relatively short FWHM and nearly the same intensity of both the peaks, shown in Table 1, reveal that GO flakes obtained are mostly monolayer as reported previously [37][38][39]. the GO flakes are of about the same thickness in the range of about 0.6 to 0.7 nm.…”

Section: Raman Spectroscopic Analysissupporting

confidence: 58%

Synthesis of mono layer graphene oxide from sonicated graphite flakes and their Hall effect measurements

Siyar

Maqsood

Khan

2014

Materials Science-Poland

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Graphene, a single atom thick sheet is considered a key candidate for the future nanotechnology, due to its unique extraordinary properties. Researchers are trying to synthesize bulk graphene via chemical route from graphene oxide precursor. In the present work, we investigated a safe and efficient way of monolayer graphene oxide synthesis. To get a high degree of oxidation, we sonicated the graphite flakes before oxidation. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) results confirmed graphene oxide formation and high degree of oxidation. Raman spectroscopy and atomic force microscopy (AFM) results revealed a monolayer of graphene oxide (GO) flakes. The sheet like morphology of the GO flakes was further confirmed by scanning electron microscopy (SEM). The Hall effect measurements were performed on the GO film on a silica substrate to investigate its electrical properties. The results obtained, revealed that the GO film is perfectly insulating, having electrical resistivity up to 8.4 × 10 8 (Ω·cm) at room temperature.

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Section: Raman Spectroscopic Analysissupporting

confidence: 58%

Synthesis of mono layer graphene oxide from sonicated graphite flakes and their Hall effect measurements

Siyar

Maqsood

Khan

2014

Materials Science-Poland

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“…For as-synthesized po-Gr flakes, no significant bands were observed, which may be due to the incomplete exfoliation process. Indeed, after successful redispersion in water and following centrifugation, po-Gr film on glass showed significant bands at~3430 (OH stretch), 2337 (CO 2 stretch), 1722 (C = O stretch), and 1637 cm −1 (OH bending and C = C stretch) (Pham et al, 2011). The FT-IR spectrum of PEDOT:PSS showed peaks at 1372, 1289, 1124, 1023, 1002 cm −1 , which are derived from PEDOT:PSS (Alemu Mengistie et al, 2013;Yoo et al, 2014).…”

Section: Characterization Of Po-gr and Po-gr/pedot:pss Filmmentioning

confidence: 99%

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

et al. 2014

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Partially oxidized graphene flakes (po-Gr) were obtained from graphite electrode by an electrochemical exfoliation method. As-produced po-Gr flakes were dispersed in water with the assistance of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS). The po-Gr flakes and the po-Gr/PEDOT:PSS nanocomposite (po-Gr/PEDOT:PSS) were characterized by Raman spectroscopy, Fourier transform-infrared spectroscopy (FT-IR), UV-Vis spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). In addition, we demonstrated the potential use of po-Gr/PEDOT:PSS electrode in electrochemical detection of mercury ions (Hg 2+ ) in water samples. The presence of po-Gr sheets in PEDOT:PSS film greatly enhanced the electrochemical response for Hg 2+ . Cyclic voltammetry measurements showed a well-defined Hg 2+ redox peaks with a cathodic peak at 0.23V, and an anodic peak at 0.42V. Using differential pulse stripping voltammetry, detection of Hg 2+ was achieved in the range of 0.2-14 µM (R 2 = 0.991), with a limit of detection of 0.19 µM for Hg 2+ . The electrode performed satisfactorily for sensitive and selective detection of Hg 2+ in real samples, and the po-Gr/PEDOT:PSS film remains stable on the electrode surface for repeated use.Therefore, our method is potentially suitable for routine Hg 2+ sensing in environmental water samples.

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“…The main peak is related to the π → π * transition of the aromatic C-C bonds, whereas the latter is related to the n→ π * transition that is generated from the nonbonding electrons of oxygenated functional groups [23,34]. Monolayer graphene sheet is known to have a thickness of 0.34 nm.…”

Section: Characterization Of Gomentioning

confidence: 99%

Solution processable graphene oxide hole transport layers and their application in P3HT:HHPER active layer based BHJSC

MEMİŞOĞLU¹,

DİKER²,

Varlıklı³

2015

Turk J Phys

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Graphene oxide (GO) material was synthesized by an improved Hummers method and characterized by FT-IR, XPS, XRD, AFM, SEM, and UV-VIS analyses. The thickness of the GO layer was measured as 1.5 nm. Solution processed bulk heterojunction solar cells comprising poly(3-hexylthiophene) (P3HT) as the electron donor and N,N'-bis-2-(1-hydoxyhexyl)-3,4,9,10-perylenebis(dicarboximide) (HHPER) as the electron acceptor component of the active layer were produced with and without the GO doped PEDOT-PSS hole transport layers. The optical investigations of the active layer were performed by ground state absorption and photoluminescence measurements. Optimized blend w/w was determined as P3HT:HHPER, 3:1. It was found that the presence of GO in PEDOT:PSS by 0.05 w/w reduces the charge transfer resistance and enhances not only the Jsc , but also V oc values. However, it cannot inhibit V oc losses obtained through annealing the active layer at temperatures higher than 120• C.

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Chemical functionalization of graphene sheets by solvothermal reduction of a graphene oxide suspension in N-methyl-2-pyrrolidone

Cited by 362 publications

References 38 publications

Synthesis of mono layer graphene oxide from sonicated graphite flakes and their Hall effect measurements

Synthesis of mono layer graphene oxide from sonicated graphite flakes and their Hall effect measurements

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

Solution processable graphene oxide hole transport layers and their application in P3HT:HHPER active layer based BHJSC

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