Se adlattices formed on Au(100), studies by LEED, AES, STM and electrochemistry

A scanning tunneling microscopy investigation of the phases formed by the sulfur adsorption on Au(100) from an alkaline solution of 1,4-piperazine(bis)-dithiocarbamate of potassium

“…Quasi-square structures formed by eight atoms have also been observed by EC STM from chemisorbed Se on Au(111) [40,41] and on Au(100) [41,42]. A square arrangement of four isolated Se atoms tetramer-like, probably in high coordinate sites has been reported to be formed at high coverage [41,42].…”

The Voltammetric Analysis of Selenium Electrodeposition from H2SeO3 Solution on Gold Electrode

“…The three peaks are noticed when the scan is reversed to the positive direction, and according to the literature [20,[22][23][24][25][26][27] they are related with selenium oxidation. The peak F is related with the dissolution of bulk selenium and G with underpotentially deposited selenium.…”

“…The onset potential of the voltammetric experiment was set at 0.5 V vs. Ag/AgCl electrode and was swept in the negative direction first, then reversed at -0.6 V. Subsequently, the potential was changed to the second reverse potential 1.1 V and the whole scan was finished at the initial potential 0.5 V. During the sweeping in the negative direction five reduction peaks A, B, C, D and E are observed. The nature of these peaks was analyzed in acidic environment by several groups and is described in the subsequent papers [19,20,[22][23][24][25][26][27][28]. It should be noted that common feature for all these reports is gold substrate, but of different quality (single crystal or polycrystalline) and pretreatment procedures.…”

“…As a result of these studies, various interpretations of the voltammetry results were proposed. Stickney et al [20,22,23] suggested that peaks A and B are related with surface limited deposition process and they are similar to the underpotential deposition process, in spite of the fact that the overpotential is applied. Peaks C and D are very confusing and also behave as effects of surface limited process, but more than one monolayer is deposited on the surface according to these authors.…”

“…The very good reports by Andrews et al [19], Stickney at al. [20][21][22][23][24], Alanyalioglu et al [25] Machado et al [26,27] and Kowalik [28] provided extensive analysis of selenium electrodeposition on gold. Nonetheless, some aspects of the voltammetry results are still not clear.…”