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Observations on Spatial Specificity in the Modification of Porous Graphene Layers.

Abhijna Das1, Marcus Waser1, Kyoungjun Choi1

  • 1School of Life Sciences, Institute of Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 30, 4132, Muttenz, Switzerland.

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Summary

This study demonstrates site-selective polymerization on porous graphene edges using self-initiated photografting and photopolymerization (SIPGP). This technique precisely functionalizes pore edges, enabling potential applications in advanced membranes.

Keywords:
functionalization of graphenegraphene edge reactivityporous grapheneself‐initiated photografting and photopolymerizationspatial specificity

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Self-initiated photografting and photopolymerization (SIPGP) is a versatile technique for surface polymerization.
  • Previous SIPGP methods lacked site selectivity on materials like graphene.
  • Porous graphene offers unique structural properties for functionalization.

Purpose of the Study:

  • To achieve site-selective functionalization of porous graphene using SIPGP.
  • To investigate the control over polymer grafting at pore edges.
  • To explore potential applications of functionalized porous graphene in membranes.

Main Methods:

  • Utilized SIPGP to polymerize styrene monomers on chemical vapor-deposited porous graphene.
  • Leveraged pore edges as directing reactive sites for radical-mediated polymerization.
  • Analyzed functionalized graphene using atomic force microscopy (AFM).

Main Results:

  • Achieved preferential polymer grafting along and from the pore edges of porous graphene.
  • Demonstrated spatial selectivity via AFM, showing polymer rims around pores.
  • Showcased tunability of polymer rim height and pore dimensions by adjusting reaction time (0-24 hours).

Conclusions:

  • SIPGP can be precisely controlled for site-selective functionalization of porous graphene edges.
  • Functionalized porous graphene holds promise for advanced membrane technologies.
  • Potential applications include Per- and Polyfluoroalkyl substances (PFAs)-free waterproof membranes and water desalination membranes.