Issue 12, 2020, Issue in Progress

Thermally reduced pillared GO with precisely defined slit pore size


Graphene oxide (GO) pillared with tetrakis(4-aminophenyl)methane (TKAM) molecules shows a narrow distribution of pore size, relatively high specific surface area, but it is hydrophilic and electrically not conductive. Analysis of XRD, N2 sorption, XPS, TGA and FTIR data proved that the pillared structure and relatively high surface area (∼350 m2 g−1) are preserved even after thermal reduction of GO pillared with TKAM molecules. Unlike many other organic pillaring molecules, TKAM is stable at temperatures above the point of GO thermal reduction, as demonstrated by TGA. Therefore, gentle annealing results in the formation of reduced graphene oxide (rGO) pillared with TKAM molecules. The TKAM pillared reduced graphene oxide (PrGO/TKAM) is less hydrophilic as found using dynamic vapor sorption (DVS) and more electrically conductive compared to pillared GO, but preserves an increased interlayer-distance of about 12 Å (compared to ∼7.5 Å in pristine GO). Thus we provide one of the first examples of porous rGO pillared with organic molecules and well-defined size of hydrophobic slit pores. Analysis of pore size distribution using nitrogen sorption isotherms demonstrates a single peak for pore size of ∼7 Å, which makes PrGO/TKAM rather promising for membrane and molecular sieve applications.

Graphical abstract: Thermally reduced pillared GO with precisely defined slit pore size

Supplementary files

Article information

Article type
03 Jan 2020
04 Feb 2020
First published
13 Feb 2020
This article is Open Access
Creative Commons BY license

RSC Adv., 2020,10, 6831-6839

Thermally reduced pillared GO with precisely defined slit pore size

A. Nordenström, A. Iakunkov, J. Sun and A. V. Talyzin, RSC Adv., 2020, 10, 6831 DOI: 10.1039/D0RA00067A

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