Comparative assessment of n-dodecanethiol and n-dodecaneselenol monolayers on electroplated copper

Electrochemical and spectroscopic study of C12H25X molecules adsorption on copper sheets, X (–SH, –S–S–, –SeH and –Se–Se–)

“…Both "selenium" SAMs exhibit smaller O/Cu Table 1 Relative ratios (0.07 and 0.10, for R-SeH and R-Se-Se-R, respectively) compared to the "sulphur" SAMs (0.14 and 0.22, for R-SH and R-S-S-R, respectively). This dissimilarity between "selenium" and "sulphur" SAMs has been interpreted previously [45] as a consequence of the ability of selenol groups to oxidize faster and more easily than thiol groups. This behavior has therefore a significant impact on the adsorption mechanism of such molecules on copper.…”

“…Indeed, when SAMs are dense and highly organized, they form a real protective film on the surface making it resistant to ambient oxidation. Surface modification of copper with organothiols self-assembled monolayers has been widely studied and performed during the last decade [1][2][3][4][5][7][8][9][10][14][15][16][17][18]23,25,26,32,33,[44][45][46][47][48][49].…”

“…While the literature on the use of selenol functional groups to form SAMs is still controversial [50][51][52][53][54][55][56][57][58][59][60][61][62], our group recently demonstrated the significant effect of selenol (in terms of reduction efficiency and blocking properties) compared to thiol when reacted with electroplated copper [45]. Despite the presence of an initial oxide layer, n-dodecanethiol as well as n-dodecaneselenol molecules have shown to chemically adsorb on electroplated copper.…”

“…The oxidation state of copper surface is an important parameter for reproducible formation of high quality monolayers. Indeed, we have previously shown that an electrochemical reduction pretreatment is essential to form well defined oriented films with high reproducibility [25,[45][46][47]. The quality of the SAMs is checked using electrochemical techniques, such as cyclic voltammetry (CV) and scanning electrochemical microscopy (SECM); and spectroscopic techniques, such as X-ray photoelectron spectroscopy (XPS) and polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS).…”

Electrochemical and surface analytical studies of the self-assembled monolayer of 5-methoxy-2-(octadecylthio)benzimidazole in corrosion protection of copper

“…For bare copper, the spectrum shows a peak at 489.5 cm −1 which is assigned to copper oxide on the surface [39]. Mekhalif et al [40] studied the comparative assessment of n-dodecanethiol and n-dodecaneselenol monolayers on electroplated copper. In their infrared reflection absorption study they interpreted the two bands at 2922 cm −1 and 2851 cm −1 to the asymmetric CH 2 and symmetric CH 2 modes respectively.…”