Scanning Electrochemical Microscopy geometry

The BEM has been applied in scanning electrochemical microscopy applications by Fisher and Denuault [169] to examine the influence of probe and substrate surface topography. In addition, time-dependent phenomena have been assessed in oil droplets [170, 171] and a range of microelectrode geometries using the dual reciprocity method (DRM) [172] closely related to the BEM [173]. 

Amphlett, J.L. and Denuault, G. (1998) Scanning electrochemical microscopy (SECM) an investigation of the effects of tip geometry on amperometric tip response. Jourtud of Physical Chemistry B, 102, 9946-9951. 

Sklyar O, Treutler TH, Vlachopoulos N, Wittstock G (2005) The geometry of nanometersized electrodes and its influence on electrolytic currents and metal deposition processes in scanning tunnelling and scanning electrochemical microscopy. Surf Sci 597 181-195... 

Zoski, C. G., B. Lin, and A. J. Bard, Scanning electrochemical microscopy Theory and characterization of electrodes of finite conical geometry. Anal. Chem., Vol. 76, 2004 pp. 3646-3654. 

FIGURE 5.1 Comparison of (A) simulated SECM transients with (B) transients corresponding to different electrode geometries (aU processes are diffusion controlled), (a) SECM transient for a conductive substrate, (b) two-electrode thin-layer cell, (c) microdisk, (d) planar electrode, (e) SECM with an insulating substrate, and (f) one-electrode thin-layer cell. Curves A, B, E, and F were computed with L = d/a=0.l. (Adapted from Bard, A.J., Denuault, G., Friesner, R.A., Dornblaser, B.C., and Tuckerman, L.S., Scanning electrochemical microscopy Theory and application of the transient (chronoamperometric) SECM response. Anal. Chem., 63, 1282-1288, 1991. Copyright 1991 American Chemical Society.)... 

FIGURE 5.4 Geometry of the simulation domain and the parameters defining the diffusion problem for SECM. (Adapted from Shao, Y. and Mirkin, M.V., Probing ion transfer at the liquid/liquid interface by scanning electrochemical microscopy (SECM), J. Phys. Chem. B, 102, 9915-9921, 1998. Copyright 1998 American Chemical Society.)... 

FIGURE 5.10 Steady-state current-distance curves for a conical tip over conductive (A) and insulating (B) substrates corresponding to the values of the parameter f/=/i/a shown in the figure. L is the distance between the substrate and the point of tip closest to it normalized by the base radius. The upper curve in (A) and the lower curve in (B) were computed for a disk-shaped tip. (Adapted from Zoski, C.G., Liu, B., and Bard, A.J., Scanning electrochemical microscopy Theory and characterization of electrodes of finite conical geometry. Anal. Chem., 76, 3646-3654, 2004. Copyright 2004 American Chemical Society.)... 

Figure 17-27 Gold microelectrode with spherical tip. [From J. Abbou. C. Demaille. M. Druet, and J. MoirouK "Fabrication of Submicromeler-Sized Gold Electrodes of Controlled Geometry for Scanning Electrochemical-Atomic Force Microscopy," Anal. Chem. 2002, 74,6355.]...

Abbou, J., Demaille, C., Druet, M., and Moiroux, J. 2002. Fabrication of submicrometer-sized gold electrodes of controlled geometry for scanning electrochemical-atomic force microscopy. Anal. Chem. 74 6355-6363. 

---