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Analysis of Chemical Structure of Reduced Graphite Oxide Synthesized in Different Reduction Atmospheres
Author(s) -
Shen Lu,
Li Yong,
Zhao Wenjie,
Lu Huanming,
Miao Lijing,
Xie Weiping,
Shui Xiaoxue,
Wang Kui,
Shen Bin
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803473
Subject(s) - graphene , exfoliation joint , graphite , oxide , graphite oxide , materials science , thermal stability , carbon fibers , chemical engineering , graphene oxide paper , nanotechnology , composite material , metallurgy , composite number , engineering
In this work, a comparative study of thermally reduced graphite oxide (rGO) materials prepared by thermal exfoliation and reduction of graphite oxide (GO) at the temperature of 300 °C and 600 °C under different atmospheres (air, N 2 , Ar, vacuum and H 2 ) was investigated through kinds of characterizations. The evaluation of chemical structure and quality of the rGOs by these various atmospheres is of high importance and is attempted side‐by‐side for the first time in this paper. The order of C/O ratio of rGOs obtained at 600 °C is that HH‐rGO>HV‐rGO>HAr‐rGO≈HN‐rGO>HA‐rGO, whereas the effect of atmospheres on the rGOs obtained at 300 °C is not obvious. HH‐rGO possesses better restoration of π‐conjugated structure and the increased average size of sp 2 carbon domains compared with other rGOs. rGOs with higher reduction degree result in the aggregation of rGO nanosheets and closer to graphite structure. TGA results proved the order of thermal stability is that HH‐rGO>HV‐rGO>HAr‐rGO≈HN‐rGO>HA‐rGO. Additionally, HH‐rGO could be easily exfoliated to few‐layer nanosheets compared with others according to the AFM measurement. We believe that the findings will deepen our understanding of graphene obtained via thermal exfoliation and reduction method.