Poly(3-octylthiophene)/stearic Acid Langmuir and Langmuir-Blodgett films: Preparation and characterization

A study is reported on Langmuir and Langmuir-Blodgett (LB) films obtained by adding different percentages of stearic acid (SA) to poly(3-octylhiophene) (P3OT). Surface pressure - mean molecular area ([pi] - A) isotherms, ultraviolet-visible (UV-Vis) absorption spectrum, atomic force microscope (AFM)...

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Published inMaterials research (São Carlos, São Paulo, Brazil) Vol. 17; no. 6; pp. 1442 - 1448
Main Authors Silva, Edilene Assunção da, Oliveira, Vinícius Jessé Rodrigues de, Braunger, Maria Luisa, Constantino, Carlos José Leopoldo, Olivati, Clarissa de Almeida
Format Journal Article
LanguageEnglish
Published Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 01.12.2014
ABM, ABC, ABPol
Subjects
Absorption spectra
Atomic force microscopy
Chemical Sciences
electrical characterization
Electrical measurement
Electrodes
ENGINEERING, CHEMICAL
Isotherms
Langmuir
Langmuir-Blodgett
Langmuir-Blodgett films
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
polythiophenes
Roughness
sensors
Stearic acid
polythiophenes
electrical characterization
sensors
Langmuir
Langmuir-Blodgett
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Summary:A study is reported on Langmuir and Langmuir-Blodgett (LB) films obtained by adding different percentages of stearic acid (SA) to poly(3-octylhiophene) (P3OT). Surface pressure - mean molecular area ([pi] - A) isotherms, ultraviolet-visible (UV-Vis) absorption spectrum, atomic force microscope (AFM) and dc electrical measurements have been used for characterization. From [pi] - A isotherms, the area per monomer for condensed films (of SA) increased according to P3OT amount. Good transfer ratios were obtained for LB deposition from P3OT/SA films with higher percentage of SA. LB films revealed linear growth as monitored by UV-Vis absorption spectra. Electrical characterization showed higher conductivity for LB film with 54 wt.% of SA. AFM images of the same film revealed high roughness and presence of large size agglomerates. Finally, interdigitated electrodes (IDE) coated with P3OT/SA LB films showed to be sensitive to the presence of volatile organic compounds.
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ISSN:1516-1439
1980-5373
1516-1439
1980-5373
DOI:10.1590/1516-1439.288814