Artículos de revistas
Studies on the interaction between humic substances and conducting polymers for sensor application
Fecha
2005-01-01Registro en:
Journal of the Brazilian Chemical Society, v. 16, n. 1, p. 24-30, 2005.
0103-5053
10.1590/S0103-50532005000100004
S0103-50532005000100004
WOS:000227616100003
2-s2.0-17444372410
2-s2.0-17444372410.pdf
Autor
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Universidade de São Paulo (USP)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
The interaction between humic substances and poly(o-ethoxyaniline) (POEA), a conducting polymer, was investigated for both solution and self-assembled films. The results have shown that the humic substances induce a doping of POEA by protonation, as indicated by UV-Vis and Raman spectroscopies. The atomic force microscopy (AFM) studies on the self-assembled films have shown that the average roughness of the polymer film has increased after exposing it to humic substances (fulvic and humic acids), consistent with the interaction between POEA and humic substances. However, this change in morphology is reversible by washing the films with water in agreement with the electrical data allowing using this system in sensor applications. Here, the sensor formed by an array of different sensing units was able to detect and distinguish humic substances in aqueous solution, as shown by multivariate analysis (principal component analysis). The motivation to detect humic substance comes due to its importance in terms of quality control of water or soil. ©2005 Sociedade Brasileira de Química.