A portable electronic nose based on surface acoustic wave (SAW) sensors is proposed in this work to detect toxic chemicals, which have a great potential to threaten the surrounding natural environment or adversely affect the health of people. We want to emphasize that ferrite nanoparticles, decorated (Au, Pt, Pd) and undecorated, have been used as sensitive coatings for the first time in these types of sensors. Furthermore, the proposed electronic nose incorporates signal conditioning and acquisition and transmission modules. The electronic nose was tested to low concentrations of benzene, toluene, and xylene, exhibiting excellent performance in terms of sensitivity, selectivity, and response time, indicating its potential as a monitoring system that can contribute to the detection of toxic compounds.
Keywords: portable electronic nose; Love-SAW sensor; surface acoustic wave; Fe2O3 sensitive layer; gas detection
This work was supported by the Fundación General CSIC via Programa ComFuturo and the Spanish Ministry of Science, Innovation and Universities under the projects RTI2018-095856-B-C22 (AEI/FEDER) and TEC2016-79898-C6 (AEI/FEDER).