Probing Nanoscale Domains of J-Aggregates Deposited on a Mica Surface

Abstract

J-aggregates of 1,1′,3,3′-tetraethyl-5,5′,6,6′-tetrachlorobenzimidazolocarbocyanine (TTBC) were deposited on a mica surface and probed by atomic force microscopy operated at tapping mode in air. Optical spectra showed that J-aggregates were formed in aqueous solutions. Atomic force microscopy images revealed that J-aggregates deposited on mica surfaces mainly present single domains with a mean height of 2.00 ( 0.25 nm and an average diameter of 100 ( 20 nm. Quantitative analysis of the morphology of images indicated that the single domain of J-aggregates exhibits very uniform height and diameter distributions with polydispersity indices of 1.02 and 1.04, respectively. Based on the results, we propose a two-dimensional nanostructure in which TTBC J-aggregates could be arranged in a monolayer.

Effect of organic solvents on J aggregation of pseudoisocyanine dye at mica/water interfaces: Morphological transition from three-dimension to two-dimension

“…The interactions between the anionic mica surface and cationic PIC molecules would be stabilized via an epitaxial match [13][14][15] if the molecules are adsorbed on their molecular plane perpendicular to the surface. Hence PIC lying flat on the surface is less likely because the interactions between the ionic surface and the molecular plane of PIC would be less favorable [13][14][15]29]. Using the adsorption scheme (ii), adsorbed PIC molecules form a monomolecular layer of J aggregates in the mixed solvent of Dox/water, whereas those probably form bilayer J aggregates in PrOH/water.…”

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

“…Such scaffolds could be the polymer molecules [165] and nanoparticles formed of them [166,167], semiconductor QDs [168,169], orthovandate nanocrystals [170]. The J-aggregates are readily assembled on the surface of mica [171].…”

Plasmonic Fluorescent Nanocomposites of Cyanines Self-assembled upon Gold Nanoparticle Scaffolds

“…Cyanine 1 might form different types of aggregates with J-bands of 580 -600 nm. [21][22][23] One of these aggregates showed a J-band at 592 nm and a H-band at 500 nm perhaps due to Davydov splitting 22,23 giving rise to the excitation maximum at 500 nm. Cyanine 2 shows absorption maxima around 550 and 600 nm (Fig.…”