Ionic conductance through graphene: Assessing its applicability as a proton selective membrane

Pavan Chaturvedi; Ivan V. Vlassiouk; David A. Cullen; Adam J. Rondinone; Nickolay V. Lavrik; Sergei N. Smirnov

doi:10.1021/acsnano.9b06505

Ionic conductance through graphene: Assessing its applicability as a proton selective membrane

Pavan Chaturvedi
, Ivan V. Vlassiouk
, David A. Cullen
, Adam J. Rondinone
, Nickolay V. Lavrik
, Sergei N. Smirnov

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

Inspired by recent reports on possible proton conductance through graphene, we have investigated the behavior of pristine graphene and defect engineered graphene membranes for ionic conductance and selectivity with the goal of evaluating a possibility of its application as a proton selective membrane. The averaged conductance for pristine chemical vapor deposited (CVD) graphene at pH1 is â&circ;4 mS/cm² but varies strongly due to contributions from the unavoidable defects in our CVD graphene. From the variations in the conductance with electrolyte strength and pH, we can conclude that pristine graphene is fairly selective and the conductance is mainly due to protons. Engineering of the defects with ion beam (He⁺, Ga⁺) irradiation and plasma (N₂ and H₂) treatment showed improved areal conductance with high proton selectivity mostly for He-ion beam and H₂ plasma treatments, which agrees with primarily vacancy-free type of defects produced in these cases confirmed by Raman analysis.

Original language	English
Pages (from-to)	12109-12119
Number of pages	11
Journal	ACS Nano
Volume	13
Issue number	10
DOIs	https://doi.org/10.1021/acsnano.9b06505
State	Published - Oct 22 2019
Externally published	Yes

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title = "Ionic conductance through graphene: Assessing its applicability as a proton selective membrane",

abstract = "Inspired by recent reports on possible proton conductance through graphene, we have investigated the behavior of pristine graphene and defect engineered graphene membranes for ionic conductance and selectivity with the goal of evaluating a possibility of its application as a proton selective membrane. The averaged conductance for pristine chemical vapor deposited (CVD) graphene at pH1 is {\^a}\&circ;4 mS/cm2 but varies strongly due to contributions from the unavoidable defects in our CVD graphene. From the variations in the conductance with electrolyte strength and pH, we can conclude that pristine graphene is fairly selective and the conductance is mainly due to protons. Engineering of the defects with ion beam (He+, Ga+) irradiation and plasma (N2 and H2) treatment showed improved areal conductance with high proton selectivity mostly for He-ion beam and H2 plasma treatments, which agrees with primarily vacancy-free type of defects produced in these cases confirmed by Raman analysis.",

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T2 - Assessing its applicability as a proton selective membrane

AU - Chaturvedi, Pavan

AU - Vlassiouk, Ivan V.

AU - Cullen, David A.

AU - Rondinone, Adam J.

AU - Lavrik, Nickolay V.

AU - Smirnov, Sergei N.

PY - 2019/10/22

Y1 - 2019/10/22

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AB - Inspired by recent reports on possible proton conductance through graphene, we have investigated the behavior of pristine graphene and defect engineered graphene membranes for ionic conductance and selectivity with the goal of evaluating a possibility of its application as a proton selective membrane. The averaged conductance for pristine chemical vapor deposited (CVD) graphene at pH1 is â&circ;4 mS/cm2 but varies strongly due to contributions from the unavoidable defects in our CVD graphene. From the variations in the conductance with electrolyte strength and pH, we can conclude that pristine graphene is fairly selective and the conductance is mainly due to protons. Engineering of the defects with ion beam (He+, Ga+) irradiation and plasma (N2 and H2) treatment showed improved areal conductance with high proton selectivity mostly for He-ion beam and H2 plasma treatments, which agrees with primarily vacancy-free type of defects produced in these cases confirmed by Raman analysis.

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Ionic conductance through graphene: Assessing its applicability as a proton selective membrane

Abstract

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