Formation of defects in the graphite oxidization process: a positron study

Gong, Wei, He, Dongning, Tao, Jinlong, Zhao, Pengfei, Kong, Lingxue, Luo, Yongyue, Peng, Zheng and Wang, Hao 2015, Formation of defects in the graphite oxidization process: a positron study, RSC advances, vol. 5, no. 108, pp. 88908-88914, doi: 10.1039/c5ra14660g.

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Title Formation of defects in the graphite oxidization process: a positron study
Author(s) Gong, Wei
He, Dongning
Tao, Jinlong
Zhao, Pengfei
Kong, LingxueORCID iD for Kong, Lingxue
Luo, Yongyue
Peng, Zheng
Wang, Hao
Journal name RSC advances
Volume number 5
Issue number 108
Start page 88908
End page 88914
Total pages 7
Publisher Royal Society of Chemistry
Place of publication Cambridge, Eng.
Publication date 2015
ISSN 2046-2069
Keyword(s) Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Summary High-resolution positron annihilation lifetime (PAL) and two-detector coincidence Doppler broadening of annihilation radiation (2D-DBAR) measurements on graphite and its oxide derivatives for defect information, differing in oxidization agents, are reported. Positron measurements were found to be very effective in the investigation of defects in graphite and its derivatives. Positrons are mainly annihilated in vacancy-like defects on the particle surface and in large open-volume holes associated with the interface of graphite and graphite oxide. Different types of defects have been detected for unexfoliated graphite oxide and exfoliated graphene oxide based on 2D-DBAR measurements, namely the vacancy cluster and vacancy-oxygen complexes. It is also interesting to observe that the calculated large open-volume diameter of graphene oxide coincides with the distance between the layers from the XRD investigation, which indicates that the annihilation of the long-lived lifetime component τ3 might take place in the area between the graphene layers; no large open-volume hole has been detected.
Language eng
DOI 10.1039/c5ra14660g
Field of Research 091202 Composite and Hybrid Materials
Socio Economic Objective 860602 Inorganic Industrial Chemicals
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Royal Society of Chemistry
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