Effect of nanoscale water media confinement on the approach curve in SICM
S. Yu. Lukashenko,
O. M. Gorbenko,
M. L. Felshtyn,
I. D. Sapozhnikov,
S. V. Pichakhchi,
M. V. Zhukov,
A. O. Golubok https://doi.org/10.17586/2220-8054-2025-16-6-770-777
Abstract
The features of the ion current dependence on distance when a glass nanopipette with an aperture diameter of ∼100 nm approaches the surface of a solid dielectric in a scanning ion conductivity microscope have been studied. A characteristic peak in the approach curve has been observed when the electrode in the nanopipette with an electrolyte is negatively biased relative to electrode in the bath, while a monotonic current decline occurs with a positive bias. To explain this unusual behavior of the ion current, the model accounting for the overlap of electric double layers and water confinement phenomenon in nanochannels and nanogaps have been proposed. The model demonstrates good agreement with the experimental data and provides a basis for quantitative assessment of surface charge at electrolyte–solid interfaces with nanometer-scale spatial sensitivity.
Keywords
nanoscale water confinement,
nanopore,
peak-effect,
Poisson–Nernst–Planck equations,
surface charge density
Supporting agencies: This work is supported by the Ministry of Science and Higher Education of the Russian Federation (Project No. 075-00444-25-00, dated 26.12.2024) and by the Russian Science Foundation (Project No. 24-79-00169.
About the Authors
S. Yu. Lukashenko
Institute for Analytical Instrumentation of the Russian Academy of Sciences
Russian Federation
Russian Federation
Stanislav Yu. Lukashenko
O. M. Gorbenko
Institute for Analytical Instrumentation of the Russian Academy of Sciences
Russian Federation
Russian Federation
Olga M. Gorbenko
M. L. Felshtyn
Institute for Analytical Instrumentation of the Russian Academy of Sciences
Russian Federation
Russian Federation
Mikhail L. Felshtyn
I. D. Sapozhnikov
Institute for Analytical Instrumentation of the Russian Academy of Sciences
Russian Federation
Russian Federation
Ivan D. Sapozhnikov
S. V. Pichakhchi
Institute for Analytical Instrumentation of the Russian Academy of Sciences
Russian Federation
Russian Federation
Stepan V. Pichakhchi
M. V. Zhukov
Institute for Analytical Instrumentation of the Russian Academy of Sciences
Russian Federation
Russian Federation
Mikhail V. Zhukov
A. O. Golubok
Institute for Analytical Instrumentation of the Russian Academy of Sciences
Russian Federation
Russian Federation
Alexander O. Golubok
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For citations:
Lukashenko S.Yu., Gorbenko O.M., Felshtyn M.L., Sapozhnikov I.D., Pichakhchi S.V., Zhukov M.V., Golubok A.O. Effect of nanoscale water media confinement on the approach curve in SICM. Nanosystems: Physics, Chemistry, Mathematics. 2025;16(6):770-777. https://doi.org/10.17586/2220-8054-2025-16-6-770-777
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