TY  - JOUR
AU  - Garcia, S. G.
AU  - Mayer, C. E.
AU  - Salinas, D. R.
AU  - Staikov, G.
TI  - In Situ STM Study of Electrocrystallization of Ag on Ag(111)
JO  - Journal of the Brazilian Chemical Society
VL  - 15
SN  - 0103-5053
CY  - São Paulo
PB  - SBQ
M1  - PreJuSER-46694
SP  - 917
PY  - 2004
N1  - Record converted from VDB: 12.11.2012
AB  - The electrocrystallization process was studied in the system Ag(111)1Ag(+). SO4= by in situ scanning tunneling microscopy (STM). The results show that Ag deposition occur preferentially at step edges following a layer-by-layer growth mechanism, but polarization and imaging conditions Greatly affect the local kinetics of this process. At STM-tip potentials more positive than the Ag/Ag- equilibrium potential. a local dissolution of the substrate underneath the tip is observed even at low negative substrate overpotentials, at which the overall substrate current density is cathodic. An in sire STM imaging of Ag deposition was possible at sufficiently high negative substrate overpotentials. An estimation of the local deposition current density, however. indicates that the deposition rate underneath the STM-tip is reduced. These results are explained by the presence of an electric field between the STM-tip and the substrate, which affects the potential distribution directly underneath the tip. producing a large shielding of the diffusive flux of Ag+ ions.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000226205000020
UR  - https://juser.fz-juelich.de/record/46694
ER  -