Hydrazine sensors development based on a glassy carbon electrode modified with a nanostructured TiO 2 films by electrochemical approach

The authors describe a selective hydrazine sensor that is based on the use of a film of TiO 2 nanoparticles faceted predominantly at the 101 and 001 sides. The hydrazine (Hyd) sensor was fabricated by depositing the nanoparticles in 5% concentration in a nafion matrix on a glassy carbon electrode (GCE). The sensor exhibits a fast response, excellent sensitivity and good selectivity over 1.0 nM to 10.0 mM. The sensor responds linearly to the logarithm of the concentration of dissolved hydrazine in the range from 1.0 nM to 10.0 mM, with a sensitivity of 35.04 μA.mM −1 .cm −2 . The detection limit is 28.8 ± 0.2 pM (at an S/N ratio of 3) is extremely low. In our perception, this approach emerges as an effective technique for developing efficient chemical sensors for environmental pollutants. Graphical abstract Schematic presentation of a hydrazine sensor based on TiO 2 nanoparticles placed on a glassy carbon electrode with 5% Nafion for the selective and efficient detection of hydrazine in environmental water samples.