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 (π - A) isotherms, ultraviolet-visible (UV-Vis) absorption spectrum, atomic force microscope (AFM) and dc electrical measurements have been used for characterization. From π - 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.

Bibliographic Details

Main Authors:	Silva,Edilene Assunção da, Oliveira,Vinícius Jessé Rodrigues de, Braunger,Maria Luisa, Constantino,Carlos José Leopoldo, Olivati,Clarissa de Almeida
Format:	Digital revista
Language:	English
Published:	ABM, ABC, ABPol 2014
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000600012
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