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| - Catalytic Effect of Gold Nanoparticles Self-Assembled in Multilayered Polyelectrolyte Films
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| - Multilayer films composed of poly(l-arginine) (pArg) and mercaptoundecanoic acid (MUA) stabilized goldnanoparticles (Au−MUA NPs) have been fabricated based on the electrostatic layer-by-layer self-assemblytechnique upon a gold electrode modified with a first layer of mercaptosuccinic acid (MSA). The formationof the pArg/Au−MUA NP self-assemblies as alternative multilayers was confirmed by UV−vis absorptionspectroscopy and atomic force microscopy while their electrochemical properties were studied using cyclicvoltammetry, square wave voltammetry, and electrochemical impedance spectroscopy. Charge transport throughthe multilayer was studied experimentally by using the redox pair [Fe(CN)6]3-/4-. It was found that thesenew assemblies have a high permeability to the probe ions. The presence of the Au−MUA NPs greatlyimproves the conductivity and the electron-transfer ability of the film which exhibited new electrical propertiescharacterized by a low impedance response and enhanced electric current as more layers were added for bothAu−MUA NP and pArg terminated multilayers. It is concluded that the behavior observed is based on twocumulative contributions: electron transfer mediated by the Au−MUA NPs layers and ionic diffusion favoredby the poly(l-arginine) layers due to the Donnan inclusion. The films obtained showed high conductiveproperties which represent very promising features for the construction of electrochemical sensors ornanoelectronic devices.
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