Titanium dioxide nanostructures chemical sensor

Titanium dioxide (TiO2) nanostructures were grown directly on the
sensitive area of the transducer. A titanium thin film was deposited on
2 . 2 mm(2) alumina substrates by RF magnetron sputtering and
hydrothermal method was used to achieve TiO2. This method is
characterized by the use of different solutions (KOH, NaOH), a not
stirred pressure reactor and a heating system. As-prepared samples
require an acid treatment followed by a calcination step to obtain pure
TiO2 nanostructures. The nanostructured morphology was confirmed by a
scanning electron microscope (SEM) and their structural properties were
investigated by RAMAN spectroscopy. Obtained samples were used as gas
sensors, and their behaviour towards several gaseous species was
analysed in a wide range of working temperatures. Measurements were
carried out in a test chamber, investigating the change in the
electrical conductance due to the surrounding atmosphere.