Login

Journal Image
Current Nanoscience
ISSN (Print): 1573-4137
ISSN (Online): 1875-6786
VOLUME: 10
ISSUE: 5
DOI: 10.2174/1573413710666140411000614      Price:  $58









Atomic Force and Scanning Near-Field Optical Microscopy Study of Carbocyanine Dye J-aggregates

img
Author(s): V.V. Prokhorov, M.G. Petrova, N.N. Kovaleva and E.I. Demikhov
Pages 700-704 (5)
Abstract:
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 3x4 nm2 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.
Graphical Abstract:
Keywords:
Carbocyanine dye, elementary fibril, high-resolution atomic force microscopy, J-aggregate, probe microscopy, scanning near-field optical microscopy.
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninsky pr., Moscow, 119991 Russia.