Nickel/carbon composites (Ni−C) have been synthesized by a pyrolysis treatment carried out at the temperature of 675 °C, of NiO incorporated into a pyrogallol‐formaldehyde organic wet gel. Structural and morphological characterizations of the Ni−C samples were performed by XRD and SEM analysis, respectively. Electrochemical non‐enzymatic glucose sensors were fabricated modifying the working electrode surface of screen printed carbon electrodes. Cyclic voltammetry and amperometric tests were performed in order to investigate the electrocatalytic activity of differently Ni loaded carbon towards the oxidation of glucose in alkaline 0.1 M KOH solution. The sensor based on 30 % Ni/carbon showed the best sensing performance towards glucose monitoring with a sensitivity of 670 μA/mM cm−1 in the a liner range from 20 to 500 μM, and a detection limit lower than 8 μM at S/N=3.

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Cu 2 SnS 3 (CTS) nanoparticles were successfully synthesized by simple solvothermal technique maintained at 200°C for 24 h. The structural properties showed that the Cu 2 SnS 3 nanoparticles exhibit cubic phase with high crystallinity and a grain size between 11 and 15 nm. CTS nanoparticles exhibited a broad absorption in a wide wavelength range from UV to visible light, with a direct band gap of 1.27 eV. The electrical proprieties of the synthesized material show a variation of the conductivity as a function of measurement temperature. The dc sample conductivity measurements reveal that 3D-VRH is the dominated conduction model in the studied material. However, the dynamic conductivity study shows that correlated barrier hopping model may be appropriate to describe the transport mechanism in our material.

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