Adsorption characteristics of OH-terminated alkanethiol and arenethiol on Au(111) surfaces

Nanoscale
Yung-Fang Liu, Yuh-Lang Lee

Abstract

Adsorption behaviors of hydroxyl-terminated alkanethiol, 3-mercapto-1-propanol (MPO), and arenethiol, 4-mercaptophenol (MPH), on Au(111) electrodes were studied by cyclic voltammetry (CV) and in situ scanning tunneling microscopy (STM). The effects of the molecular structure and the chain length on the characteristics of the self-assembled monolayers (SAMs) were investigated by comparison with the results of 11-mercapto-1-undecanol (MUO) and 6-mercapto-1-hexanol (MHO) reported in the literature. All the alkanethiol SAMs have the same coverage ratio (0.33 ML). For MUO which has a longer chain length, a hexagonal lattice, the (√3 ×√3) structure was observed. However, for shorter thiols (MHO and MPO), the adsorbed molecules exhibit different contrasts under the imaging of STM, ascribed to the different conformations of adsorbed molecules. The CV results indicated that a longer chain length triggers a SAM with higher adhesion and higher resistance to the charge transfer across a SAM. For the SAM of arenethiol, MPH, the π-π stacking interaction of the phenyl ring leads to a lower surface mobility of thiol/Au complexes, lower coverage ratio, and less uniform structure of the adlayer. Furthermore, the vacancy islands commonly observed...Continue Reading

References

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Citations

Feb 20, 2015·Nanoscale·Mohamed A MezourDmitrii F Perepichka
Mar 30, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Sylvain MasseyLéon Sanche
Jan 10, 2017·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Miriam C Rodríguez GonzálezAlberto Hernández Creus
Aug 15, 2018·Nature Communications·Eleonora MacchiaLuisa Torsi
Nov 16, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Akito FujitaHirofumi Yamada

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