Počet záznamů: 1
Tuning the surface potential of Ag surfaces by chemisorption of oppositely-oriented thiolated carborane dipoles
- 1.0429454 - ÚACH 2015 RIV US eng J - Článek v odborném periodiku
Lübben, J.F. - Baše, Tomáš - Rupper, P. - Künniger, T. - Macháček, Jan - Guimond, S.
Tuning the surface potential of Ag surfaces by chemisorption of oppositely-oriented thiolated carborane dipoles.
Journal of Colloid and Interface Science. Roč. 354, č. 1 (2011), s. 168-174. ISSN 0021-9797. E-ISSN 1095-7103
Grant CEP: GA AV ČR(CZ) IAA400320901
Klíčová slova: Adsorption * Thiolated carboranes * Silver surface * Surface potential * X-ray photoelectron spectroscopy
Kód oboru RIV: CA - Anorganická chemie
Impakt faktor: 3.070, rok: 2011
Two selected carboranethiol isomers were used to modify flat silver surfaces. Both isomers, 1,2-(HS)(2)-1, 2-C(2)B(10)H(10) (a) and 9,12-(HS)(2)-1,2-C(2)B(10)H(10) (b), are relatively strong dipoles with two SH groups per molecule. They are both anchored to the surface via two SH groups per molecule. Topography and surface potential changes of the modified silver surfaces were studied using Scanning Kelvin Probe Force Microscopy (SKPFM). These measurements proved that both isomers are oppositely oriented on the surface. The former isomer increases, and the latter one decreases the surface potential of a modified silver film. The relative changes of the surface potential correlate well with the dipole moments of the isomers. Competitive chemisorption from a 1:1 mixture of both isomers shows that the isomer (a) is found in a significantly higher concentration on the surface than the isomer (b). This has been proved by both SKPFM and X-ray photoelectron spectroscopy (XPS) techniques. Additionally, contact angle measurements were carried out to characterise the modified surfaces, and these and XPS results show the presence of hydrophobic hydrocarbon contaminants.
Trvalý link: http://hdl.handle.net/11104/0234572
Počet záznamů: 1