Synergy between Polyaniline and OMt Clay Mineral in Langmuir-Blodgett Films for the Simultaneous Detection of Traces of Metal Ions

Autor(es)

de Barros, Anerise ^{[1, 2]} ; Ferreira, Mariselma ^[3] ; Leopoldo Constantino, Carlos Jose ^[4] ; Ribeiro Bortoleto, Jose Roberto ^[5] ; Ferreira, Marystela ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos UFSCar, Sao Paulo - Brazil

^[2] Univ Estadual Paulista, Fac Ciencias, UNESP POSMAT, Sao Paulo - Brazil

^[3] Univ Fed ABC UFABC, Sao Paulo - Brazil

^[4] Univ Estadual Paulista, UNESP, Fac Ciencias & Tecnol, Sao Paulo - Brazil

^[5] Univ Estadual Paulista, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED MATERIALS & INTERFACES; v. 7, n. 12, p. 6828-6834, APR 1 2015.
• Citações Web of Science: 16

Resumo

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 (Cd2+), lead (Pb2+) and copper (Cu2+). 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 properties of nanostructures for sensing and related applications. (AU)

• Processo FAPESP: 12/16158-0 - Filmes nanoestruturados de híbridos orgânico-inorgânicos para sensores ambientais
• Beneficiário: Marystela Ferreira
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/00733-2 - Filmes de nanocompósitos de polímeros condutores, nanopartículas de argila e nanopartículas de ouro para aplicação em sensores ambientais
• Beneficiário: Anerise de Barros
• Linha de fomento: Bolsas no Brasil - Doutorado