Ionic Conductance through Graphene: Assessing Its Applicability as a Proton Selective Membrane
| Autor: | Adam J. Rondinone, Sergei N. Smirnov, Ivan Vlassiouk, Pavan Chaturvedi, David A. Cullen, Nickolay V. Lavrik |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Ion beam Proton Graphene General Engineering General Physics and Astronomy Conductance 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention symbols.namesake Membrane law Chemical physics symbols Ionic conductivity General Materials Science 0210 nano-technology Raman spectroscopy |
| Zdroj: | ACS Nano. 13:12109-12119 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.9b06505 |
| Popis: | 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 ∼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. |
| Databáze: | OpenAIRE |
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