Abstract:
:Defect-free monolayers of graphene and hexagonal boron nitride are surprisingly permeable to thermal protons, despite being completely impenetrable to all gases. It remains untested whether small ions can permeate through the two-dimensional crystals. Here we show that mechanically exfoliated graphene and hexagonal boron nitride exhibit perfect Nernst selectivity such that only protons can permeate through, with no detectable flow of counterions. In the experiments, we use suspended monolayers that have few, if any, atomic-scale defects, as shown by gas permeation tests, and place them to separate reservoirs filled with hydrochloric acid solutions. Protons account for all the electrical current and chloride ions are blocked. This result corroborates the previous conclusion that thermal protons can pierce defect-free two-dimensional crystals. Besides the importance for theoretical developments, our results are also of interest for research on various separation technologies based on two-dimensional materials.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Mogg L,Zhang S,Hao GP,Gopinadhan K,Barry D,Liu BL,Cheng HM,Geim AK,Lozada-Hidalgo Mdoi
10.1038/s41467-019-12314-2subject
Has Abstractpub_date
2019-09-18 00:00:00pages
4243issue
1issn
2041-1723pii
10.1038/s41467-019-12314-2journal_volume
10pub_type
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