Attoampere Nanoelectrochemistry - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2021

Attoampere Nanoelectrochemistry

Simon Grall
Ivan Alić
  • Fonction : Auteur
Eleonora Pavoni
  • Fonction : Auteur
Teruo Fujii
  • Fonction : Auteur
Stefan Müllegger
  • Fonction : Auteur
Marco Farina
  • Fonction : Auteur
Georg Gramse

Résumé

Local electrochemical measurements and imaging at the nanoscale are crucial for the future development of molecular devices, sensors, materials engineering, electrophysiology and various energy applications from artificial photosynthesis to batteries. The ultimate step towards single-molecule sensitivity requires the measurement of aA currents, which is three orders of magnitude below that of current state-of-the-art measurement abilities. Here, we show electrochemical measurements at the sub aA level and <80 nm spatial resolution, that we reach by exploiting the ultra-high sensitivity of our GHz microscope for local faradaic interface capacitances. We demonstrate this for a well-known surface-bound ferrocene alkyl monolayer, a system that cannot be studied at the nanoscale unless large nanoarrays are used11. We report the simultaneous measurement of local cyclic voltammograms (CV) which provide atomistic information on the respective electron transfer reaction and reveal two molecular configurations with a similar redox energy potential -- insights inaccessible by electrochemical ensemble measurements.

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Dates et versions

hal-03102010 , version 1 (07-01-2021)

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Simon Grall, Ivan Alić, Eleonora Pavoni, Teruo Fujii, Stefan Müllegger, et al.. Attoampere Nanoelectrochemistry. 2021. ⟨hal-03102010⟩

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