Growth of Layered Copper–Alkanethiolate Frameworks from Thin Anodic Copper Oxide Films

ARISNABARRETA, N.; PAREDES-OLIVERA, P.; COMETTO, F. P.; PATRITO, E. M.

JOURNAL OF PHYSICAL CHEMISTRY C

AMER CHEMICAL SOC

Año: 2019 vol. 123 p. 17283 - 17283

1932-7447

e investigated the conversion of electrochemically grown CuO into copper−alkanethiolate lamellar structures supported on a Cu substrate upon immersion in solutions of nalkanethiols. After considering different preparation conditions (alkyl chain length, thiol concentration, and type of solvent), wefound that the oxide can be rapidly converted into compactand highly passivating lamellar layers in 1-octanethiolate/0.1 M NaOH forming solutions. Alkaline forming solutions play a key role in favoring the conversion of CuO into the lamellar compound vs the competing mechanism in which the oxide is reduced and the thiolates are oxidized to disulfides. The oxide conversion into the layered structure is incomplete for both short and long alkanethiols, and it is almost complete in the case of 1-octanethiol. The use of less polar solvents such as ethanol or n-hexane is much less effective in producing layered Cu−thiolates.Spectroscopic ellipsometry measurements showed that 10-nm-thic