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Substrate-Tight Graphene Transmembrane-nanofluidic Devices.

Xiaofang Kang1, Buhang Chen2, Erik P van Geest1

  • 1Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, Leiden, 2333CC, The Netherlands.

Small (Weinheim an Der Bergstrasse, Germany)
|February 5, 2025
PubMed
Summary

A pyrene-based coating enhances graphene membrane stability in nanofluidic devices. This adhesion layer prevents delamination, significantly improving device success rates for applications like sensing and ion sieving.

Keywords:
(sub)nanofluidicsadhesiongrapheneion transportpyrene

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Graphene nanopores show promise for single-molecule sensing, ion sieving, and osmotic power harvesting.
  • A major obstacle is the instability of ultrathin graphene membranes, which delaminate in aqueous solutions.

Purpose of the Study:

  • To develop a method for stabilizing graphene membranes in nanofluidic devices.
  • To improve the operational lifespan and success rates of graphene-based transmembrane devices.

Main Methods:

  • Utilizing a pyrene-based coating to adhere graphene to a substrate.
  • Exposing coated graphene membranes to aqueous electrolyte solutions to test stability.
  • Measuring the success rates of graphene transmembrane devices before and after coating.

Main Results:

  • The pyrene-based coating effectively prevented graphene delamination over several days in electrolyte.
  • Pyrene molecules formed strong π-π bonds with graphene, enhancing adhesion.
  • Device success rates increased dramatically from 4% to 76.2% with the pyrene coating.

Conclusions:

  • Adhesion layers are crucial for enhancing the stability of graphene in nanofluidic devices.
  • The pyrene-based coating significantly prolongs the operational lifespan of graphene transmembrane devices.
  • This approach enables the development of more robust graphene-based devices for diverse applications.