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Title: Voltage gated inter-cation selective ion channels from graphene nanopores

Abstract

With the ability to selectively control ionic flux, biological protein ion channels perform a fundamental role in many physiological processes. For practical applications that require the functionality of a biological ion channel, graphene provides a promising solid-state alternative, due to its atomic thinness and mechanical strength. Here, we demonstrate that nanopores introduced into graphene membranes, as large as 50 nm in diameter, exhibit inter-cation selectivity with a ~20× preference for K + over divalent cations and can be modulated by an applied gate voltage. Liquid atomic force microscopy of the graphene devices reveals surface nanobubbles near the pore to be responsible for the observed selective behavior. Molecular dynamics simulations indicate that translocation of ions across the pore likely occurs via a thin water layer at the edge of the pore and the nanobubble. Our results reflect a significant improvement in the inter-cation selectivity displayed by a solid-state nanopore device and by utilizing the pores in a de-wetted state, offers a method to fabricate selective graphene membranes that does not rely on the fabrication of sub-nm pores.

Authors:
ORCiD logo [1];  [2];  [1];  [3]; ORCiD logo [4];  [2];  [2];  [3]; ORCiD logo [4];  [2];  [1]
  1. Boston Univ., MA (United States)
  2. Lockheed Martin Advanced Technology Center (ATC), Palo Alto, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Tsinghua Univ., Beijing (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1531231
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 11; Journal Issue: 20; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Graphene; membrane; nanopores; selective ion transport; conductance

Citation Formats

Cantley, Lauren, Swett, Jacob L., Lloyd, David, Cullen, David A., Zhou, Ke, Bedworth, Peter V., Heise, Scott, Rondinone, Adam J., Xu, Zhiping, Sinton, Steve, and Bunch, J. Scott. Voltage gated inter-cation selective ion channels from graphene nanopores. United States: N. p., 2019. Web. doi:10.1039/C8NR10360G.
Cantley, Lauren, Swett, Jacob L., Lloyd, David, Cullen, David A., Zhou, Ke, Bedworth, Peter V., Heise, Scott, Rondinone, Adam J., Xu, Zhiping, Sinton, Steve, & Bunch, J. Scott. Voltage gated inter-cation selective ion channels from graphene nanopores. United States. doi:10.1039/C8NR10360G.
Cantley, Lauren, Swett, Jacob L., Lloyd, David, Cullen, David A., Zhou, Ke, Bedworth, Peter V., Heise, Scott, Rondinone, Adam J., Xu, Zhiping, Sinton, Steve, and Bunch, J. Scott. Mon . "Voltage gated inter-cation selective ion channels from graphene nanopores". United States. doi:10.1039/C8NR10360G.
@article{osti_1531231,
title = {Voltage gated inter-cation selective ion channels from graphene nanopores},
author = {Cantley, Lauren and Swett, Jacob L. and Lloyd, David and Cullen, David A. and Zhou, Ke and Bedworth, Peter V. and Heise, Scott and Rondinone, Adam J. and Xu, Zhiping and Sinton, Steve and Bunch, J. Scott},
abstractNote = {With the ability to selectively control ionic flux, biological protein ion channels perform a fundamental role in many physiological processes. For practical applications that require the functionality of a biological ion channel, graphene provides a promising solid-state alternative, due to its atomic thinness and mechanical strength. Here, we demonstrate that nanopores introduced into graphene membranes, as large as 50 nm in diameter, exhibit inter-cation selectivity with a ~20× preference for K+ over divalent cations and can be modulated by an applied gate voltage. Liquid atomic force microscopy of the graphene devices reveals surface nanobubbles near the pore to be responsible for the observed selective behavior. Molecular dynamics simulations indicate that translocation of ions across the pore likely occurs via a thin water layer at the edge of the pore and the nanobubble. Our results reflect a significant improvement in the inter-cation selectivity displayed by a solid-state nanopore device and by utilizing the pores in a de-wetted state, offers a method to fabricate selective graphene membranes that does not rely on the fabrication of sub-nm pores.},
doi = {10.1039/C8NR10360G},
journal = {Nanoscale},
number = 20,
volume = 11,
place = {United States},
year = {2019},
month = {5}
}

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