2. How to use SECM

The main ways in which SECM is used are [6] :

• feedback mode (FB) ;

• generation/collection (GC) mode ;

• penetration mode ;

• direct mode ;

• equilibrium disturbance mode ;

• ion transfer mode at the interface between two immiscible electrolyte solutions (ITIES);

• potentiometric mode.

The FB, GC and penetration modes are illustrated in figure 3 . The basic principles of these SECM modes of operation are given here, using ultramicroelectrodes of the planar disk geometry most commonly...