Stabilizing graphene layers by intercalating laponite between them

Publication date: February 2018 Source:New Carbon Materials, Volume 33, Issue 1 Author(s): Jing Li, Jin-can Cui, Zhen-zhen Yang, Han-xun Qiu, Zhi-hong Tang, Jun-he Yang 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.

Source: New Carbon Materials - March 23, 2018 Category: Chemistry Source Type: research