Effect of clay in controlling the non-fluorescence H-dimeric states of a cationic dye Nile Blue Chloride (NBC) in hybrid Langmuir–Blodgett (LB) film

• Published in: Chemical physics letters Vol. 691; pp. 298 - 306
• Main Authors: Debnath, Chandan, Shil, Ashis, Hussain, S.A., Bhattacharjee, D.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2018
• Subjects: BAM images; Isotherms; Langmuir Blodgett (LB) films; Nile Blue Chloride (NBC); Spectroscopy; BAM images; Spectroscopy; Langmuir Blodgett (LB) films; Isotherms; Nile Blue Chloride (NBC)
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2017.11.038

In-situ Brewster Angle Microscopic (BAM) images of Langmuir monolayer at the air-water Interface and the UV–vis absorption and fluorescence spectra of corresponding ODA-NBC-Clay hybrid LB films fabricated at different Clay concentrations.
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•Effect of building matrices and nano-clay platelets on the aggregation properties of Nile Blue Chloride (NBC).•Formation of H-dimer in concentrated aqueous solution and in Langmuir Blodgett Films.•Controlling of H-dimer of NBC in the presence of nano Clay platelets.•In-situ BAM images for the visible evidence of the formation of aggregates in Langmuir Monolayer.
Present communication reports the effect of amphiphilic matrices and nano-clay platelets on the aggregation properties of a water soluble cationic fluorescent dye Nile Blue Chloride (NBC) in Langmuir-Blodgett (LB) films. In-situ Brewster Angle Microscopic (BAM) studies showed distinct domain structures of complex and hybrid Langmuir monolayer at the air-water interface. UV–vis absorption spectra showed non-fluorescent H-dimeric band in concentrated aqueous solution of NBC and in complex LB film of NBC with stearic acid. By changing various parameters, a great control over H-dimeric states has been achieved in clay incorporated hybrid LB films. These films can act as efficient fluorescence probe.