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

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.

Publication year: 2016
Authors: A. De Barros a, b, C.J.L. Constantino c, J.R.R. Bortoleto d, N.C. Da Cruz d, M. Ferreira b

a – Faculdade de Ciências, UNESP/POSMAT, Univ. Estadual Paulista, Bauru, SP, Brazil
b – Universidade Federal de São Carlos, UFSCar, Campus Sorocaba, SP, Brazil
c – Faculdade de Ciências e Tecnologia, UNESP Univ. Estadual Paulista, Presidente Prudente, SP, Brazil
d – Campus Experimental de Sorocaba, UNESP Univ. Estadual Paulista, Sorocaba, SP, Brazil

Published in: Sensors and Actuators B: Chemical, Vol. 236, 2016, p. 408–417
DOI: 10.1016/j.snb.2016.06.022


gold nanoparticles Langmuir Blodgett (LB) film layer thickness nanoparticles incorporated in the polymer polymer


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