Electrical Properties of Au/Polyimide/Squarylium-Arachidic Acid Junctions Fabricated by the Langmuir-Blodgett Technique

Anti-malarial methylene blue (MB) doped in arachidic acid (AA) have been incorporated in the Langmuir monolayer at the air–water interface and also in the Langmuir–Blodgett films deposited on quartz substrate. The pressure–area (π–A) isotherm studies at different concentrations of MB pointed out that pure MB could not form stable monolayer at the air–water interface and collapse readily at very low surface pressures. However, mixture of MB with AA formed stable monolayers and they could be transferred into solid quartz substrate to form mono/multi layered films of MB. The area per molecule of floating mixed monolayers was systematically decreased with the increasing concentrations of MB in the mixture. The pressure–time (π - t) isotherm study indicated the interaction kinetics between MB and AA. Higher the concentration of MB, higher is the increase in pressure. The spectroscopic characteristics of the mixed LB films have been compared with that of pure MB solution, microcrystal and layer-by-layer self assembled film with UV-Vis absorption spectroscopy. Surface morphology of the mixed LB and LbL film of MB was measured with atomic force microscopy (AFM).

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Structural, optical and electrical properties of CdS–polyaniline Langmuir–Blodgett films

10.1063/1.4872818 ◽

2014 ◽

Author(s):

Nayan Mani Das ◽

Dhrubojyoti Roy ◽

M. Gupta ◽

V. Ganesan ◽

P. S. Gupta

Keyword(s):

Electrical Properties ◽

Optical And Electrical Properties ◽

Langmuir Blodgett ◽

Langmuir Blodgett Films

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New Strategies for Preparing Electrically Conductive Langmuir-Blodgett Films

MRS Proceedings ◽

10.1557/proc-247-859 ◽

1992 ◽

Vol 247 ◽

Author(s):

J. H. Cheung ◽

R. B. Rosner ◽

M. F. Rubner

Keyword(s):

Electrical Properties ◽

Stearic Acid ◽

Structural Changes ◽

Solid State Reactions ◽

Emeraldine Base ◽

Structure Property ◽

Electrically Conductive ◽

Lb Films ◽

Langmuir Blodgett ◽

Langmuir Blodgett Films

ABSTRACTThe fabrication, structure and electrical properties of new electrically conductive Langmuir-Blodgett (LB) films of polyaniline and polypyrrole have been investigated. Polyaniline in its emeraldine-base form was mixed with stearic acid (PAN-B/SA) to produce stable films at the air-water interface (5/1 or 10/1 mole ratio of PAN-B/SA). These films were then transferred into multilayer films which were found to exhibit conductivities of about 1 S/cm upon doping with hydrochloric acid. The alkyl chains of the stearic acid molecules were found to be distributed randomly throughout the LB film thereby exerting a minimal influence on the electrical properties of the polyaniline phase. In addition to this mixed monolayer approach, a novel method of fabricating highly conductive polypyrrole LB films has been developed. This method is based on the sequential exposure of ferric stéarate LB films to hydrogen chloride (HC1) gas and pyrrole vapor. Each of these two solid state reactions was found to impart dramatic chemical and structural changes to the film. Polypyrrole LB films with conductivities as high as 5 S/cm were produced via this process. The electrical and optical properties of films made by both techniques were examined in order to elucidate their structure/property relationships.

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Wettability of fibrous quartz with Langmuir-Blodgett films of arachidic acid and/or cellulose didecanoate

Journal of Adhesion Science and Technology ◽

10.1163/156856196x00157 ◽

1996 ◽

Vol 10 (11) ◽

pp. 1129-1140 ◽

Cited By ~ 4

Author(s):

Keiko Gotoh ◽

Saori Yoshimitsu ◽

Mieko Tagawa

Keyword(s):

Arachidic Acid ◽

Langmuir Blodgett ◽

Langmuir Blodgett Films

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