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

Exchange versus intercalation of n-dodecanethiol monolayers on copper in the presence of n-dodecaneselenol and vice versa

“…The contribution of the thiolate peak is more pronounced with increasing immersion time. S/Cu ratio increases slightly from 0.01 to 0.05, however the Se/Cu ratio is relatively constant ($0.07) and is very close to the value reported previously for ndodecaneselenol SAM on copper ($0.06) [82]. The ratio (S + Se)/ Cu enhances from 0.07 to 0.13 (Table 2).…”

“…It is necessary to immerse at least 30 min in the RSeH solution to see the appearance of selenium and an increase of its amount with time immersion getting higher. The ratio S/Cu is relatively constant ($0.06) and is close to the n-dodecanethiol SAM on copper surface [82]. The Se/Cu is slightly increased (from 0.00 to 0.03) which has as consequence the increase of the (S + Se)/Cu value from 0.05 to 0.10.…”

“…n-Dodecanethiol and n-dodecaneselenol molecules have been self-assembled on copper electrochemically reduced as performed in previous work [82] to provide modified surfaces RS-Cu and RSeCu respectively and have been used as platforms for the stability tests. For this purpose both SAMs have been put in contact with the antagonist molecules (RSeH for RS-Cu SAM and RSH for RSe-Cu SAM) present in solution for different immersion times.…”

“…The clean copper substrates were then electrochemically reduced (À820 mV/SCE) for 10 min in an aqueous solution of HClO 4 (0.5 M) bubbling with N 2 (previously deaerated 10 min with N 2 ) and directly immersed in 10 À2 M RSH or RSeH in absolute ethanol solutions for 2 h. (The condition of modification used has been previously reported for the modification on oxidized [27] and electrochemically reduced copper surfaces [82]). Finishing immersion, the copper samples were removed and rinsed with absolute ethanol.…”

Low‐Dimensional Copper Selenide Nanostructures: Controllable Morphology and its Dependence on Electrocatalytic Performance

“…The binding energy of Cu 2p 3/2 from Cu 2‐ x Se nanorods, nanotubes, and nanoflakes can be fitted into two peaks loaded at 931.7 eV (Cu + , 81.62 %) and 933.5 eV (Cu 2+ , 18.38 %), 931.3 eV (Cu + , 75.97 %) and 933.3 eV (Cu 2+ , 24.03 %), and 931.5 eV (Cu + , 78.51 %) and 933.2 eV (Cu 2+ , 21.49 %), respectively. The spectra of Se 3d suggest the co‐existence of Se 2− together with a small amount of other selenide species, which could adsorb on the surface of nanostructures …”