XPS analysis of two-dimensional j-aggregate of cyanine dye self-assembled on bromide-covered Ag(111)
✍ Scribed by Kawasaki, Mitsuo
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 169 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
An atomically Ñat Ag(111) Ðlm covered with a halide monolayer allows well-ordered two-dimensional (2D) aggregates of cyanine dyes to be easily self-assembled from a dilute monomeric dye solution. The superior planarity of the sample carrying the self-assembled monolayer makes the XPS method a powerful tool to illuminate the molecular orientation and arrangement of dye molecules in their 2D network. This is exempliÐed by analysing the 2D J-aggregate of a typical cyanine dye, a particularly unique molecular assembly of both fundamental and practical interest. The collective Coulomb interaction involving the cationic dye chromophores and counter-anions, as reÑected upon a marked (¿1 eV) chemical shift in the relevant XPS signals, is likely to play a critical role in determining the 2D network structure characteristic of J-aggregate.