Title :
Layer-by-layer films of poly(o-ethoxyaniline), chitosan and chitosan-poly(methacrylic acid) nanoparticles and their application in an electronic tongue
Author :
Borato, Carlos E. ; Leite, Fábio L. ; Mattoso, Luiz H C ; Goy, Rejane C. ; Filho, Sergio P Campana ; De Vasconcelos, Cláudio L. ; da Trindade Neto, C.G. ; Pereira, Márcia R. ; Fonseca, José L C ; Oliveira, Osvaldo N., Jr.
Author_Institution :
Embrapa Instrum. Agropecuaria, Sao Carlos
Abstract :
Layer-by-layer (LbL) films have been produced with poly(o-ethoxyaniline) (POEA), chitosan and chitosan-poly(methacrylic acid) (CS-PMAA) nanoparticles. Because the adsorption of LbL films depends on ionic interactions and H-bonding, optimized conditions had to be established for the growth of multilayer films. Unusually thick films were obtained for POEA and CS-PMAA, thus demonstrating the importance of using chitosan in the form of nanoparticles. These nanostructured films were deposited on chromium electrodes to form a sensor array (electronic tongue) based on impedance spectroscopy. This system was used to detect copper ions in aqueous solutions
Keywords :
adsorption; biosensors; chromium; conducting polymers; electric impedance; electrodes; hydrogen bonds; multilayers; nanoparticles; polymer films; CS-PMAA nanoparticles; H-bonding; LbL films; POEA; adsorption; chitosan-poly(methacrylic acid) nanoparticles; chromium electrodes; electronic tongue; impedance spectroscopy; ionic interactions; layer-by-layer films; multilayer films; poly(o-ethoxyaniline); sensor array; thick films; Biosensors; Chromium; Electrochemical impedance spectroscopy; Electrodes; Fabrication; Instruments; Nanoparticles; Nonhomogeneous media; Sensor arrays; Tongue;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2006.247838
