Ricerc@Sapienza

The present contribution reports on the analysis of the electrochemical properties of screen-printed nickel oxide (NiO) in aqueous electrolyte when NiO is in the configuration of thin film (thickness, l ≤ 7 μm). This type of NiO samples presents mesoscopic morphology. The latter characteristic combined to the intrinsic electroactivity of the oxide leads to the observation of proportionality between NiO thickness and current density. In particular, NiO undergoes two distinct processes of oxidation with reversible features in aqueous media.

In this work, we developed an impedimetric label-free immunosensor for the detection of 2,4-Dichlorophenoxy Acetic Acid (2,4-D) herbicide either in standard solution and spiked real samples. For this purpose, we prepared by electropolymerization a conductive polymer poly-(aniline-co-3-aminobenzoic acid) (PANABA) then we immobilized anti-2,4-D antibody onto a nanocomposite AuNPs-PANABA-MWCNTs employing the carboxylic moieties as anchor sites.

Nanostructured nickel oxide (NiO) was deposited in the configuration of thin film (thickness, l = 2–6 m)
onto fluorine-doped tin oxide (FTO) substrates via plasma-assisted rapid discharge sintering (RDS). Electrochemical
cycling of RDS NiO in 3-methoxy-propionitrile (3-MPN) revealed two characteristic peaks
of NiO oxidation which were associated to the surface-confined redox processes Ni(II) ? Ni(III) and

Mixed ruthenium and manganese oxides electrodes (1:1 molar ratio) have been prepared by spin-coating deposition and subsequent thermal decomposition of a thin film on a titanium support. To improve both stability and adhesion of the coating, either micro- or nanomodification of the titanium surface has been investigated. The micro-modified support has been obtained by etching of the titanium foil with hydrofluoric acid (HF) while the modification at a nanoscale has been obtained by anodization of the titanium foil in a glycerol medium containing fluoride.

In this study, polythiophene copolymers have been used as modifier for electrode surfaces in order to allow the immobilization of active pyrroloquinoline quinone dependent glucose dehydrogenase (PQQ-GDH) and to simultaneously improve the direct electrical connection of the enzyme with the electrode. Polymer films are electrosynthesized in aqueous solution without the need of surfactants onto carbon nanotubes modified gold electrodes from mixtures of 3-thiopheneacetic acid (ThCH2CO2H) and 3-methoxythiophene (ThOCH3) using a potentiostatic pulse method.

Solid state electrochemistry based on the voltammetry of immobilized microparticles (VIMP) methodology is applied to a series of 80 Phoenician Red Slip samples from the archaeological sites of Motya (Sicily, Italy), Mogador (Morocco), Ramat-Rahel (Israel), Sulky (Sardinia, Italy), Tas Silg (Malta), Pantelleria (Italy), and Cádiz (Spain), dated from the 8th to the 6th century BC.