Stabilizing graphene layers by intercalating laponite between them

The reduction of graphene oxide (GO) leads to the re-stacking/agglomeration of graphene layers, which results in their precipitation from an aqueous dispersion. A laponite colloid was used to prevent re-stacking and stabilize an aqueous dispersion of reduced graphene oxide (RGO) by dispersing GO in...

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Bibliographic Details
Published in:New carbon materials 2018-02, Vol.33 (1), p.19-25
Main Authors: Li, Jing, Cui, Jin-can, Yang, Zhen-zhen, Qiu, Han-xun, Tang, Zhi-hong, Yang, Jun-he
Format: Article
Language:English
Subjects:
Aqueous dispersion
Graphene
Intercalation
Laponite
Stability
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Summary:The reduction of graphene oxide (GO) leads to the re-stacking/agglomeration of graphene layers, which results in their precipitation from an aqueous dispersion. A laponite colloid was used to prevent re-stacking and stabilize an aqueous dispersion of reduced graphene oxide (RGO) by dispersing GO in the colloid, followed by reduction with hydrazine hydrate under microwave radiation. Results indicate that re-stacking is prevented as proven by the disappearance of the RGO (002) peaks in the XRD pattern. A laponite/RGO (w/w: 1:1) dispersion shows the highest stability under centrifugation at 10 000 rpm and the largest Brunauer–Emmett–Teller surface area, which is 17.6% higher than that of RGO and 34.4% higher than laponite. Electrostatic interaction between negatively-charged RGO layers and positively-charged laponite edges lead to an intercalation structure, which is responsible for the non-stacking RGO and its stable dispersion in water. This intercalation method offers an alternative way for the dispersion of graphene layers.
ISSN:1872-5805
1872-5805
DOI:10.1016/S1872-5805(18)60323-3