A unified new analytical approximation for positive feedback currents with a microdisk SECM tip

Christine Lefrou (1)

1 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces

Analytical approximations for steady-state positive feedback currents in scanning electrochemical microscopy (SECM) experiments using a microdisk are discussed. The use of a conformal map transformation leads to the use of new mathematical functions. A general analytical expression for all values of tip–substrate distances and all types of microdisk (with various insulator thicknesses) are thus obtained with only four adjustable parameters.

Mots clés: Scanning electrochemical microscopy; Feedback mode; Disk electrode; Microelectrodes; Steady-state; Simulation

Domaines: Matériaux

Christine Lefrou. A unified new analytical approximation for positive feedback currents with a microdisk SECM tip. Journal of electroanalytical chemistry and interfacial electrochemistry, 2006, 592 (1), pp. 103-112. ⟨10.1016/j.jelechem.2006.05.003⟩. ⟨hal-00333493⟩