Incorporation of gold nanoparticles into Langmuir-Blodgett films of polyaniline and montmorillonite for enhanced detection of metallic ions

Author(s)

De Barros, A. ; Constantino, C. J. L. ; Bortoleto, J. R. R. ; Da Cruz, N. C. ; Ferreira, M.

• Document type: Journal article
• Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 236, p. 408-417, NOV 29 2016.
• Web of Science Citations: 9

Abstract

We report on effects from incorporating gold nanoparticles (AuNPs) into Langmuir-Blodgett (LB) films of emeraldine salt polyaniline (PAni-ES) and organophilic montmorillonite clay (OMt). The synergistic electrocatalytic effect induced by AuNPs led to an enhanced performance in detecting trace levels of cadmium (Cd2+), lead (Pb2+) and copper (Cu2+) ions. Detection was carried out using square wave anodic stripping (SWAS) voltammetry using ITO electrodes modified with LB films made with three supramolecular architectures: PAni-ES/AuNPs, OMt/AuNPs and OMt/AuNPs/PAni-ES, and compared to LB films without AuNPs. The incorporation of AuNPs induced secondary doping of PAni-ES, inferred from FTIR, Raman and UV-vis. absorption spectroscopies. The PAni-ES chains probably became more extended and could intercalate into the OMt galleries, causing an increased interlayer spacing according to X-ray diffraction data. These results demonstrate the possible control of film properties by exploiting molecular-level interactions in multicomponent nanostructured films. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 12/16158-0 - Nanostructured films inorganic-organic hybrids for environmental sensors
• Grantee: Marystela Ferreira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/00733-2 - Nonocomposites films of conducting polymers, clay nanoparticles and gold nanoparticles for environmental sensor aplication
• Grantee: Anerise de Barros
• Support Opportunities: Scholarships in Brazil - Doctorate