In-situ STM studies of thallium underpotential deposition on Au(111) single-crystal electrode in acid solution

Wanda Polewska; Radoslav Adzic

doi:10.1117/12.344745

8 April 1999 In-situ STM studies of thallium underpotential deposition on Au(111) single-crystal electrode in acid solution

Wanda Polewska, Radoslav Adzic

Author Affiliations +

Proceedings Volume 3725, International Conference on Solid State Crystals '98: Epilayers and Heterostructures in Optoelectronics and Semiconductor Technology; (1999) https://doi.org/10.1117/12.344745
Event: International Conference on Solid State Crystals '98, 1998, Zakopane, Poland

Abstract

The structure of electrodeposited Tl adlayers on Au(111) in 0.1 M. HClO₄ has been investigated using in-situ scanning tunneling microscopy method. Incommensurate, rotated hexagonal (RHCP) Tl adlayer was found, within a wide potential window, between Tl bulk deposition at -0.7 V and -0.4 V. This adlayer is closely packed with Tl interatomic distance of 3.4 +/- 0.2 angstroms, its rotation from the gold substrate axis is 6⁰ +/- 1⁰ and its coverage is 0.74. At slightly more positive potentials, between -0.45 V and -0.37 V, low coverage 2 X 2 phase of Tl was found, coexisting together with RHCP monolayer. At the potential region between -0.35 V and 0.8 V both ordered Tl phases disappeared and instead the formation of considerable amount of pits at the surface has been observed.

Citation Download Citation

Wanda Polewska and Radoslav Adzic "In-situ STM studies of thallium underpotential deposition on Au(111) single-crystal electrode in acid solution", Proc. SPIE 3725, International Conference on Solid State Crystals '98: Epilayers and Heterostructures in Optoelectronics and Semiconductor Technology, (8 April 1999); https://doi.org/10.1117/12.344745

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