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Characterization of graphene nanosheets obtained by a modified Hummer's method

ABSTRACT Natural graphite is an inexpensive and abundant source to obtain graphene nanosheets. The most efficient method for large-scale production is the chemical method, which is based on the oxidation of natural graphite. This paper reports the synthesis and characterization of graphene obtained...

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Bibliographic Details
Published in:Matéria 2018-01, Vol.23 (1)
Main Authors: Hack, Renata, Correia, Cláudia Hack Gumz, Zanon, Ricardo Antônio de Simone, Pezzin, Sérgio Henrique
Format: Article
Language:English
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Summary:ABSTRACT Natural graphite is an inexpensive and abundant source to obtain graphene nanosheets. The most efficient method for large-scale production is the chemical method, which is based on the oxidation of natural graphite. This paper reports the synthesis and characterization of graphene obtained by the Hummers method with some modifications. The results indicate a high degree of graphite oxidation, proving that the process was efficient. Analyses of field emission scanning electron microscopy (FEG), transmission electron microscopy (TEM), Raman spectroscopy, thermogravimetric analysis (TGA) and X-ray diffraction showed that the graphene produced presented characteristics similar to the commercial graphene. RESUMO O Grafite natural é uma fonte barata e abundante para obter nanofolhas de grafeno. O método mais eficiente para a produção em grande escala é o método químico, que se baseia na oxidação de grafite natural. Este artigo relata a síntese e caracterização de grafeno obtido pelo método Hummers com algumas modificações. Os resultados indicam um elevado grau de oxidação do grafite, provando que o processo foi eficiente. As análises de microscopia eletrônica de varredura de emissão de campo (FEG), microscopia electrônica de transmissão (TEM), espectroscopia Raman, análise termogravimétrica (TGA) e difração de raios-X revelaram que o grafeno produzido apresentou características similares ao grafeno comercial.
ISSN:1517-7076
1517-7076
DOI:10.1590/s1517-707620170001.0324