najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2025-16-6-770-777najo-1616Research ArticlePHYSICSФИЗИКАEffect of nanoscale water media confinement on the approach curve in SICMВлияние наномасштабного конфайнмента водной среды на кривую подвода в сканирующей микроскопии ионной проводимостиhttps://orcid.org/0000-0002-5356-1261ЛукашенкоС. Ю.LukashenkoS. Yu.

Stanislav Yu. Lukashenko

lukashenko13@mail.ruhttps://orcid.org/0000-0002-7054-6602ГорбенкоО. М.GorbenkoO. M.

Olga M. Gorbenko

gorolga64@gmail.comhttps://orcid.org/0000-0001-8677-061XФельштынМ. Л.FelshtynM. L.

Mikhail L. Felshtyn

mfelsztyn@yandex.ruhttps://orcid.org/0000-0003-2575-5015СапожниковИ. Д.SapozhnikovI. D.

Ivan D. Sapozhnikov

isapojnikov@gmail.comhttps://orcid.org/0000-0002-8578-5200ПичахчиС. В.PichakhchiS. V.

Stepan V. Pichakhchi

pichakhchi.s@yandex.ruhttps://orcid.org/0000-0003-3361-6947ЖуковМ. В.ZhukovM. V.

Mikhail V. Zhukov

cloudjyk@yandex.ruhttps://orcid.org/0000-0001-9970-9172ГолубокА. О.GolubokA. O.

Alexander O. Golubok

aogolubok@mail.ruInstitute for Analytical Instrumentation of the Russian Academy of SciencesRussian Federation202506012026166770777Copyright © Lukashenko S.Y., Gorbenko O.M., Felshtyn M.L., Sapozhnikov I.D., Pichakhchi S.V., Zhukov M.V., Golubok A.O., 20262026Лукашенко С.Ю., Горбенко О.М., Фельштын М.Л., Сапожников И.Д., Пичахчи С.В., Жуков М.В., Голубок А.О.Lukashenko S.Y., Gorbenko O.M., Felshtyn M.L., Sapozhnikov I.D., Pichakhchi S.V., Zhukov M.V., Golubok A.O.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1616

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.

Исследованы особенности на зависимости ионного тока от расстояния при сближении стеклянной нанопипетки с диаметром апертуры ~100 нм к поверхности твердого диэлектрика в сканирующем микроскопе ионной проводимости. При положительном смещении потенциала электрода, расположенного в нанопипетке, относительно электрода, расположенного в чашке происходит монотонное снижение тока, однако при отрицательном смещении на кривой подвода наблюдается характерный пик. Для объяснения этого необычного поведения предложена модель, учитывающая перекрытие электрических двойных слоев и явление конфайнмента водной среды в наноканалах и нанозазорах. Модель демонстрирует хорошее согласие с экспериментальными данными и обеспечивает основу для количественной оценки поверхностного заряда на границе раздела электролит–твердое тело с наномасштабной пространственной чувствительностью.

 

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The authors declare that there are no conflicts of interest present.