Journal
LANGMUIR
Volume 25, Issue 9, Pages 5398-5403Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la804256f
Keywords
-
Funding
- National Science Foundation [CHE-0645678]
- University at Buffalo, State University of New York
Ask authors/readers for more resources
Patterned mixed monolayers of porphyrins on nanocrystalline TiO2 films were fabricated by substrate-catalyzed monolayer photolithography. Tin(IV) protoporphyrin IX (SnPP), zinc(II) protoporphyrin IX (ZnPP), and iron(III) meso-tetra(4-carboxyphenyl)porphine (FeTCP) were adsorbed to TiO2 through the carboxyl groups, yielding saturation surface amounts per projected area of approximately 10(-7) Mol/cm(2). Illumination of SnPP- and ZnPP-functionalized TiO2 films with 355 nm light caused the desorption of the porphyrins, most likely through oxidative decarboxylation. SnPP was removed more rapidly than ZnPP. The faster kinetics was due, in part, to the contribution of other photochemical pathways including TiO2-catalyzed photoreduction and direct photodegradation reactions. Patterned binary monolayers were prepared by the photoinduced desorption of a protoporphyrin, followed by the adsorption of FeTCP to previously illuminated regions of the surface.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available