Hydrazine sensors development based on a glassy carbon electrode modified with a nanostructured TiO2 films by electrochemical approach

摘要

The authors describe a selective hydrazine sensorthat is based on the use of a film of TiO2 nanoparticles facetedpredominantly 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 sensitivityand good selectivity over 1.0 nM to 10.0 mM. The sensorresponds linearly to the logarithm of the concentration of dissolvedhydrazine in the range from 1.0 nM to 10.0 mM, with asensitivity of 35.04 μA.mM−1.cm−2. The detection limit is28.8 ± 0.2 pM (at an S/N ratio of 3) is extremely low. In ourperception, this approach emerges as an effective techniquefor developing efficient chemical sensors for environmentalpollutants.