Solution versus vapor growth of dipolar layers on activated oxide substrates

Monolayer adsorption of benzoic acid derivatives on activated oxide surfaces from solution and from the vapor phase are investigated with the view of modifying the work function of a conductive substrate. Para-substituted benzoic acids with a wide range of electrical dipoles allow adsorption to be followed by measuring the surface potential of the grafted substrates using the Kelvin probe technique. From the linear correlation between adsorbed molecular dipole and work function, it is possible to obtain the dipole contribution of the anchoring group. The vapor growth method has striking advantages over the monolayer growth from solution: it is extremely fast and avoids numerous problems related to solution processing such as intercalated solvent molecules in the dipole layer or chemical reactivity between the solvent and the oxide surface.


Published in:
Langmuir, 19, 12, 4871
Year:
2003
Publisher:
American Chemical Society
Keywords:
Note:
Compilation and indexing terms, Copyright 2006 Elsevier Inc. All rights reserved
03277524748
0743-7463
Vapor growth
Kelvin probe techniques
Benzoic acids
Other identifiers:
Laboratories:




 Record created 2007-04-03, last modified 2018-12-03


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)