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

[Display omitted] •Electrochemical Sensors development by Langmuir-Blodgett technique.•Metal ions detection with high performance and with low limit detection.•Incorporation of gold nanoparticles for increase the catalytic effect in the sensors.•Combination of organic and hybrid materials of low cos...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2016-11, Vol.236, p.408-417
Main Authors: De Barros, A., Constantino, C.J.L., Bortoleto, J.R.R., Da Cruz, N.C., Ferreira, M.
Format: Article
Language:English
Subjects:
Copper
Electrochemical sensors
Electrodes
Gold
Gold nanoparticles
Langmuir-Blodgett film
Langmuir-Blodgett films
Metallic ions detection
Montmorillonite
Nanoparticles
Nanostructure
Organophilic montmorillonite clay
Polyaniline
Polyanilines
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Summary:[Display omitted] •Electrochemical Sensors development by Langmuir-Blodgett technique.•Metal ions detection with high performance and with low limit detection.•Incorporation of gold nanoparticles for increase the catalytic effect in the sensors.•Combination of organic and hybrid materials of low cost for the sensors fabrication.•Characterization by UV–vis, FTIR, Raman, DRX, SPR, AFM, MEV and SWAS voltammetry. 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.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.06.022