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Formation and stability of porphyrin and phthalocyanine self-assembled monolayers on ZnO surfaces

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Details

Original languageEnglish
Pages (from-to)1264-1271
Number of pages8
JournalJournal of Porphyrins and Phthalocyanines
Volume20
Issue number08n11
DOIs
Publication statusPublished - 2016
Publication typeA1 Journal article-refereed

Abstract

Formation of self-assembled monolayers (SAMs) of three porphyrin and one phthalocyanine derivatives on thin ZnO film was studied by monitoring absorption spectra of the samples. The compounds were equipped with carboxylic or phosphate groups to bind to the surface. The SAM formation was found to be fast. The layer was formed in less than 15 min for all studied porphyrins, and 30 min was sufficient to form phthalocyanine layer. For porphyrins with different anchor groups the SAM formation was too fast to see any difference between the anchoring groups. The stability of SAMs was tested then by immersing the samples into neat solvents. Upon immersion the SAMs were gradually losing the absorbance for all the compounds with degradation trends being in line with pKa values of the binding groups of the same type. However, even for the weakest binding group the SAM was relatively stable after a few tens of minutes of washing, which was sufficient to remove physisorbed compounds but the SAM was essentially not destroyed. Comparison of SAMs on thin films with SAMs on ZnO nanorods and TiO2 nanoparticle films indicated the same fast layer formation but relatively weaker SAMs stability, showing 20–40% faster absorption losses during the washing.

Keywords

  • self-assembled monolayer; porphyrin; phthalocyanine; TiO2; nanorods

Publication forum classification

Field of science, Statistics Finland