Influence of different oxidation mechanisms on the exfoliation of intercalated graphite bisulfate using two types of graphite Influência de diferentes mecanismos de oxidação na exfoliação de bisulfato de grafite intercalado usando dois tipos de grafite

Espinosa Martinez J.A.; Sanchez Junior M.; Nobre Golcalves A.; Orrego R.M.M.; Florencio O.

Influence of different oxidation mechanisms on the exfoliation of intercalated graphite bisulfate using two types of graphite Influência de diferentes mecanismos de oxidação na exfoliação de bisulfato de grafite intercalado usando dois tipos de grafite

Tipo

Artigo

Data de publicação

2021

Periódico

Revista Materia

Citações (Scopus)

2

Autores

Espinosa Martinez J.A.
Sanchez Junior M.
Nobre Golcalves A.
Orrego R.M.M.
Florencio O.

Resumo

© 2021, Universidade Federal do Rio de Janeiro. All rights reserved.Three different processes for the synthetization of exfoliated graphite intercalation compound have been test-ed in two different type of graphite, one in powder form and the other one as flakes. Each graphite was oxidized applying the same experimental conditions (sonification, neutralization, filtering and drying) but using three different auxiliary oxidizers (H2O2, HNO3 and KClO3) previously mixed with H2 SO4. The resulting synthesized samples were characterized by X-ray diffraction, Raman spectroscopy and scanning electron microscopy. The Raman spectra analysis of the oxidized samples correspond to that of a graphene of few layers. Stronger delamination and exfoliation were observed in the samples of graphite, originally in powder form, treated with H2 SO4/HNO3.