Atomic force and scanning near-field optical microscopy study of carbocyanine dye J-aggregates

0434314 - FZÚ 2015 RIV AE eng J - Journal Article
Prokhorov, V.V. - Petrova, M.G. - Kovaleva, Natalia - Demikhov, E.I.
Atomic force and scanning near-field optical microscopy study of carbocyanine dye J-aggregates.
Current Nanoscience. Roč. 10, č. 5 (2014), s. 700-704. ISSN 1573-4137. E-ISSN 1875-6786
Institutional support: RVO:68378271
Keywords : carbocyanine dye * elementary fibri * high-resolution atomic force microscopy * J-aggregate * probe microscopy * scanning near-field optical microscopy
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.096, year: 2014

Atomic force microscopy (AFM) and scanning near-field optical microscopy (SNOM) imaging of fibrillar J-aggregates of carbocyanine dye 3,3'-bis(2-sulfopropyl)-5,5', 6,6'-tetrachloro-1,1'- dioctylbenzimidacarbocyanine (C8S3) have been conducted on mica and glass substrates at a room temperature. High resolution AFM imaging reveals that thick fibrils consist of narrow subfibrils with the cross diameter in the nanometer range. A model of the "elementary fibril" with the cross-dimension of 3 x 4 nm(2) was proposed as the aggregate of two J-ladders oriented face-to-face by their hydrophobic sides while the dye molecules are oriented normaly to the long fibril axis. The SNOM measurements have been conducted in the contact mode indicating the large mechanical strength on the fibrillar J-aggregate morphology.
Permanent Link: http://hdl.handle.net/11104/0238393