Thin Nanocomposite Films of Polyaniline/Au Nanoparticles by the Langmuir−Blodgett Technique

Abstract

The Langmuir-Blodgett (LB) method was used to deposit multilayers of polyaniline (PANI)- and mercaptoethanesulfonate (MES)-stabilized Au nanoparticles. The electrostatic interaction between the negatively charged nanoparticles in the subphase and the positively charged PANI at the air-water interface assisted the deposition of the nanocomposite film onto a solid support. These PANI/Au-NPs films were characterized using cyclic voltammetry, copper under potential deposition, scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. We found that the nanocomposite layers were uniform and reproducible. The density of Au-NPs in the monolayer depended on the acidity of the subphase as well as on the nanoparticles concentration. Moreover, the Au-NPs extrude above the PANI and therefore could be used as nanoelectrodes for the underpotential deposition (UPD) of copper.

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

“…The influence of AuNPs on LB films of various materials has been reported in several instances. Tanami et al [20] produced LB multilayers of PAni-ES and AuNPs where a composite was already formed at the air/water interface by electrostatic interaction between the negatively charged AuNPs dispersed in the water subphase and the positively charged PAni-ES molecules in the Langmuir film. The catalytic activity of these LB films depended on the AuNPs density, according to atomic force microscopy (AFM) and voltammetric analyses.…”

Synthesis, characterization and dielectric properties of Polyaniline@Ni0.5Zn0.5Fe2O4 composite nanofibers

“…3a that PANI has two characteristic absorption bands at 382 and 793 nm. The absorption band at 382 nm is attributed to π-π n transition of the benzenoid ring, while the peak at 793 nm corresponds to excitonic transition from benzenoid rings to the quinoid rings [15]. For PANI@NiZn ferrite composite, the absorption peaks are at 392 and 818 nm, which have a red shift of 10 and 25 nm, respectively, as compared with that of PANI.…”

Plasmonic polyaniline/gold nanorods hybrid composites for selective NIR photodetection: Synthesis and characterization

“…The merger of polyaniline with metallic nanoparticles to form composites has been attempted so far by diverse methodologies [34,35]. Some of the efficient strategies included are physical mixing [36][37][38], layer by layer deposition [39], polymerization of aniline in the presence of nanoparticles [40], the growth of metallic nanoparticles over the PANI chains [41], and finally, the polymerization of aniline combined with the nucleation and growth of metallic nanoparticles [42]. Direct mixing gives a simple route for preparing PANI composites with excellent control over the ratio of each component.…”