Electronic Nose Based on Carbon Nanocomposite Sensors
for Clove Essential Oil Detection
Posted on 2020-06-18 - 05:03
This work describes
the development of an electronic nose (e-nose)
based on carbon nanocomposites to detect clove essential oil (CEO),
eugenol (EUG), and eugenyl acetate (EUG.ACET). Our e-nose system comprises
an array of six sensing units modified with nanocomposites of poly(aniline),
graphene oxide, and multiwalled carbon nanotubes doped with different
acids, dodecyl benzene sulfonic acid, camphorsulfonic acid, and hydrochloric
acid. The e-nose presented an excellent analytical performance to
the detected analytes (CEO, EUG, and EUG.ACET) with high sensitivity
and reversibility. The limit of detection was lower than 1.045 ppb,
with response time (<13.26 s) and recovery time (<106.29 s)
and low hysteresis. Information visualization methods (PCA and IDMAP)
demonstrated that the e-nose was efficient to discriminate the different
concentrations of analyte volatile oil compounds. PM-IRRAS measurements
suggest that the doping mechanism of molecular architectures is composed
of a change in the oscillation energy of the characteristic dipoles
and changes in the molecular orientation dipoles CC and CO
at 1615 and 1740 cm–1, respectively. The experimental
results indicate that our e-nose system is promising for a rapid analysis
method to monitor the quality of essential oils.
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Graboski, Adriana
M.; Zakrzevski, Claudio A.; Shimizu, Flavio M.; Paschoalin, Rafaella T.; Soares, Andrey C.; Steffens, Juliana; et al. (2020). Electronic Nose Based on Carbon Nanocomposite Sensors
for Clove Essential Oil Detection. ACS Publications. Collection. https://doi.org/10.1021/acssensors.0c00636