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

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C8NR10360G· OSTI ID:1531231

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1531231
Journal Information:
Nanoscale, Vol. 11, Issue 20; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

References (37)

Engineered voltage-responsive nanopores journal January 2010
Voltage gated ion and molecule transport in engineered nanochannels: theory, fabrication and applications journal February 2014
Gated proton transport in aligned mesoporous silica films journal February 2008
Ionic Field Effect Transistors with Sub-10 nm Multiple Nanopores journal May 2009
Electrostatic Control of Ions and Molecules in Nanofluidic Transistors journal May 2005
Sub-10 nm transparent all-around-gated ambipolar ionic field effect transistor journal January 2015
The structure of suspended graphene sheets journal March 2007
Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene journal July 2008
Oxidation Resistance of Graphene-Coated Cu and Cu/Ni Alloy journal January 2011
Graphene Oxidation: Thickness-Dependent Etching and Strong Chemical Doping journal July 2008
Selective Ionic Transport through Tunable Subnanometer Pores in Single-Layer Graphene Membranes journal February 2014
Water desalination using nanoporous single-layer graphene journal March 2015
Facile Fabrication of Large-Area Atomically Thin Membranes by Direct Synthesis of Graphene with Nanoscale Porosity journal October 2018
Versatile Carbon Hybrid Films Composed of Vertical Carbon Nanotubes Grown on Mechanically Compliant Graphene Films journal March 2010
DNA Origami Nanopatterning on Chemically Modified Graphene journal October 2011
Self-Size-Limiting Nanoscale Perforation of Graphene for Dense Heteroatom Doping journal November 2015
Selective molecular sieving through porous graphene journal October 2012
Nanofiltration across Defect-Sealed Nanoporous Monolayer Graphene journal April 2015
Heterogeneous sub-continuum ionic transport in statistically isolated graphene nanopores journal October 2015
Ion selectivity of graphene nanopores journal April 2016
Extrinsic Cation Selectivity of 2D Membranes journal February 2017
Selective Ion Passage through Functionalized Graphene Nanopores journal December 2008
Scalable graphene composite membranes for enhanced ion selectivity journal October 2018
Stacked Graphene-Al 2 O 3 Nanopore Sensors for Sensitive Detection of DNA and DNA–Protein Complexes journal December 2011
Detecting the translocation of DNA through a nanopore using graphene nanoribbons journal November 2013
Graphene as a subnanometre trans-electrode membrane journal August 2010
Nanobubbles in Solid-State Nanopores journal August 2006
Study on the Surface Energy of Graphene by Contact Angle Measurements journal July 2014
Ultimate Osmosis Engineered by the Pore Geometry and Functionalization of Carbon Nanostructures journal June 2015
Specific Ion Effects at the Air/Water Interface journal April 2006
The calculation of the potential of mean force using computer simulations journal September 1995
Differentiating between Nanoparticles and Nanobubbles by Evaluation of the Compressibility and Density of Nanoparticles journal August 2018
DNA Origami Nanopatterning on Chemically Modified Graphene journal October 2011
Extrinsic Cation Selectivity of 2D Membranes journalarticle January 2017
Selective Ion Passage through Functionalized Graphene Nanopores journal July 2009
Selective Molecular Sieving through Porous Graphene text January 2012
The structure of suspended graphene sheets text January 2007

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