¤ Results 2022

Rezultate (in Romanian)

Smart system integration and prototyping

• The project developed new sensors based on nano MOX (Metal Oxide) and CNT (Carbon Nanotubes) materials for VOC detection, integrated into a smart portable system providing quantitative information about the concentration of Formaldehyde and Benzene as VOCs in indoor air.
• Sensitive materials (CuO and CoO films) with detection properties of volatile organic compounds (formaldehyde and benzene) were tested by depositing them on alumina transducers with different thicknesses.
• The target gas concentrations were established in the range of 0.5-4.0 ppm.
• The selectivity of the sensors for the two VOC gases was measured. It can be concluded that the sensors with sensitive film of CuO are partially selective for formaldehyde and have a lower working temperature by 800C than the sensors with sensitive film of CoO, which are also partially selective to formaldehyde, but at higher working temperatures.
• From the experimental point of view, the sensors have a good response (110-230 seconds), reproducible, and a complete recovery for the tested VOC gases.
• At the end, a Smart portable system to be used in houses or working environment was provided (see figure 1). The measurement data can be received and read with the help of an application developed on the phone through a bluetooth connection.

Fig. 2. 1   The portable system for real-time data acquisition