Synergy between polyaniline and OMt clay mineral in Langmuir-Blodgett films for the simultaneous detection of traces of metal ions

ACS Applied Materials & Interfaces
Anerise de BarrosM Ferreira

Abstract

We report on Langmuir-Blodgett (LB) films made with emeraldine salt polyaniline (PAni-ES) and organophilic montmorillonite clay mineral (OMt), where synergy between the components was reached to yield an enhanced performance in detecting trace levels of cadmium (Cd(2+)), lead (Pb(2+)) and copper (Cu(2+)). Detection was carried out using square wave anodic stripping (SWAS) voltammetry with indium tin oxide (ITO) electrodes modified with LB films of PAni-ES/OMt nanocomposite, whose data were compared to those obtained with electrodes coated with neat PAni-ES and neat OMt LB films. The enhanced performance in the nanocomposite may be attributed to the stabilizing and ordering effect promoted by OMt in PAni-ES Langmuir films, which then led to more homogeneous LB films. According to X-ray diffraction data, the stacking of OMt layers was preserved in the LB films and therefore the PAni-ES chains did not cause clay mineral exfoliation. Instead, OMt affected the polaronic state of PAni-ES as indicated in UV-vis, Raman and FTIR spectra, also consistent with the changes observed for the Langmuir films. Taken together these results do indicate that semiconducting polymers and clay minerals may be combined for enhancing the electrical pro...Continue Reading

References

Jul 21, 2006·The Journal of Physical Chemistry. B·He JunxiangAkihiko Yamagishi
Feb 16, 2007·Physical Chemistry Chemical Physics : PCCP·Robin H A RasRobert A Schoonheydt
Jul 30, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Joanne D KehlbeckCharles Wood
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Jun 13, 2013·Journal of Nanoscience and Nanotechnology·Ipsita HaldarSuprakas Sinha Ray

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Citations

Oct 20, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Celina Massumi MiyazakiMarystela Ferreira
May 11, 2018·Environmental Science and Pollution Research International·Momath LoMohamed M Chehimi
Dec 30, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Paulo H Michels-BritoJon Otto Fossum

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