Ricerc@Sapienza

Efficient direct electron transfer (DET) between cellobiose dehydrogenase from Corynascus thermophilus (CtCDH) and a novel gold electrode platform, obtained by covalent linking of green AuNPs and AgNPs modified with a dithiol self-assembled monolayer, consisting of biphenyl-4,4?-dithiol (BPDT), was presented. The green AuNPs and AgNPs were synthesized using quercetin as reducing agent at room temperature. TEM experiments showed that the AuNPs and AgNPs were circular in shape with an average diameter of 5 and 8 nm, respectively.

In the field of solid-state chemistry, the class of materials represented by intercalation and insertion compounds (IIC) deserves particular interest for a variety of reasons. These range from the versatility of the synthetic procedures for producing IICs, to the plethora of applications in which IICs can be adopted as active functional materials.

Arginine and copper(II) play an important role in human physiology. Arginine is a precursor of NO which is a vasodilator
and the right quantity of copper(II), bound to several amino acids, is necessary for the human body. The complex formation
between copper(II) and arginine is studied at 25 °C and in two different ionic media: 1.00 mol dm−3 NaClO4
and 1.00 mol dm−3 NaCl. The investigation is carried out potentiometrically, by employing in 1.00 mol dm−3 NaClO4

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.