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    Electronic Nose Based on Carbon Nanocomposite Sensors for Clove Essential Oil Detection

    Year: 2020

    Journal: ACS Sens., Volume 5, JUN 26, page 1814–1821

    Authors: Graboski, AM; Zakrzevski, CA; Shimizu, FM; Paschoalin, RT; Soares, AC; Steffens, J; Paroul, N; Steffens, C

    Organizations: National Council for Scientific and Technological Development-Brazil (CNPq)Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ); Coordination for the Improvement of Higher Education Personnel-Brazil (CAPES)Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]; Research Support Foundation of the State of Rio Grande of Sul-Brazil (FAPERGS); Financiadora de Estudos e Projetos (FINEP)Financiadora de Inovacao e Pesquisa (Finep); Sao Paulo Research Foundation (FAPESP)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2018/18953-8, 2017/18725-2]

    Keywords: electronic nose; carbon nanocomposite; eugenol; eugenyl acetate; pattern recognition

    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 C=C and C=O 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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