Nanostructured films employed as sensing units in an "electronic tongue" system

Nanostructured films of lignin (macromolecule extracted from sugar cane bagasse), polypyrrole (conducting polymer) and bis butylimido perylene (organic dye) were used in the detection of trace levels of fluorine (from H2SiF6), chlorine (from NaClO), Pb(+2), Cu(+2), and Cd(+2) in aqueous solutions. L...

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Published inJournal of nanoscience and nanotechnology Vol. 7; no. 2; p. 510
Main Authors da Silva, B A, Antunes, P A, Pasquini, D, Curvelo, A A S, Aroca, R F, Riul, A Júnior, Constantino, C J L
Format Journal Article
LanguageEnglish
Published United States 01.02.2007
Subjects
Biosensing Techniques
Cadmium - analysis
Chlorine - analysis
Copper - analysis
Electric Impedance
Electrochemistry - methods
Electrodes
Electronics
Fluorine - analysis
Gold - chemistry
Ions - analysis
Ions - chemistry
Lead - analysis
Lignin - analysis
Lignin - chemistry
Membranes, Artificial
Models, Chemical
Nanostructures - chemistry
Nanostructures - classification
Perylene - analogs & derivatives
Perylene - chemistry
Polymers - analysis
Polymers - chemistry
Pyrroles - analysis
Pyrroles - chemistry
Solutions - chemistry
Spectrophotometry, Ultraviolet
Spectroscopy, Fourier Transform Infrared
Water - chemistry
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Summary:Nanostructured films of lignin (macromolecule extracted from sugar cane bagasse), polypyrrole (conducting polymer) and bis butylimido perylene (organic dye) were used in the detection of trace levels of fluorine (from H2SiF6), chlorine (from NaClO), Pb(+2), Cu(+2), and Cd(+2) in aqueous solutions. Langmuir monolayers on ultrapure water were characterised by surface pressure-mean molecular area (II-A) isotherms. Langmuir-Blodgett (LB) films were transferred onto gold interdigitated electrodes and used as individual sensing units of an electronic tongue system. Impedance spectroscopy measurements were taken with the sensor immersed into aqueous solutions containing the ions described above in different molar concentrations. Fourier transform infrared absorption (FTIR) was employed to identify possible interactions between the LB films and the analytes in solution, and no significant changes could be observed in the FTIR spectra of BuPTCD and Ppy. Therefore, the results for lignin point to an interaction involving the electronic cloud of the phenyl groups with the metallic ions.
ISSN:1533-4880
1533-4899
DOI:10.1166/jnn.2007.107