2022
DOI: 10.1038/s41467-022-32590-9
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Multifunctional graphene heterogeneous nanochannel with voltage-tunable ion selectivity

Abstract: Ion-selective nanoporous two-dimensional (2D) materials have shown extraordinary potential in energy conversion, ion separation, and nanofluidic devices; however, different applications require diverse nanochannel devices with different ion selectivity, which is limited by sample preparation and experimental techniques. Herein, we develop a heterogeneous graphene-based polyethylene terephthalate nanochannel (GPETNC) with controllable ion sieving to overcome those difficulties. Simply by adjusting the applied v… Show more

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Cited by 31 publications
(17 citation statements)
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“… 43 Such theoretical predictions agreed with the pores observed in experiments using a scanning transmission electron microscope, where most subnanopores with several atoms missed were found. 44 Besides, the averaged pore diameter predicted in the MD simulations is 5 Å for Au ions with an energy of 500 keV, which is also consistent with our experimental result. 43 , 44 It is worth noting that in the MD simulations, vacancies (pores) fabricated under the ion irradiation have not undergone further thermodynamical evolution (migration, coalescence, and dissociation), which are similar to the initial vacancies in this work.…”
Section: Resultssupporting
confidence: 90%
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“… 43 Such theoretical predictions agreed with the pores observed in experiments using a scanning transmission electron microscope, where most subnanopores with several atoms missed were found. 44 Besides, the averaged pore diameter predicted in the MD simulations is 5 Å for Au ions with an energy of 500 keV, which is also consistent with our experimental result. 43 , 44 It is worth noting that in the MD simulations, vacancies (pores) fabricated under the ion irradiation have not undergone further thermodynamical evolution (migration, coalescence, and dissociation), which are similar to the initial vacancies in this work.…”
Section: Resultssupporting
confidence: 90%
“…The above simulation results show the stability of vacancy distributions after the long-term vacancy evolution in monolayer graphene, which is also confirmed by our previous theoretical and experimental works on subnanopores fabricated using the irradiation of energetic ions in monolayer graphene. , In the classical MD simulations, the irradiation of ions can directly generate subnanopores due to the cascade collisions, and most of the pores, which are essentially vacancies, are with several atoms removed . Such theoretical predictions agreed with the pores observed in experiments using a scanning transmission electron microscope, where most subnanopores with several atoms missed were found . Besides, the averaged pore diameter predicted in the MD simulations is 5 Å for Au ions with an energy of 500 keV, which is also consistent with our experimental result. , It is worth noting that in the MD simulations, vacancies (pores) fabricated under the ion irradiation have not undergone further thermodynamical evolution (migration, coalescence, and dissociation), which are similar to the initial vacancies in this work.…”
Section: Resultssupporting
confidence: 86%
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“…The ion selectivity ( S ) is defined as the ratio of D Cl – / D K + , where D Cl – and D K + mean the diffusion coefficients for Cl – and K + , respectively. The ion selectivity could be quantitatively calculated based on the Goldman–Hodgkin–Katz equation , E = k normalb T e .25em ln ( S a H + a L S a L + a H ) where E , k b , T , and e represent the diffusion potential, Boltzmann constant, absolute temperature, and electron charge, respectively, and a H and a L are the activities of Cl – for the high- and low-concentration solutions, respectively. The selectivity of Cl – toward K + would be calculated to be ∼53, indicating a much faster Cl – migration than K + migration in the P4VP channel.…”
Section: Resultsmentioning
confidence: 99%