A sensor array based on mass and capacitance transducers for the detection of adulterated gasolines |
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Authors: | N.K.L. A. M. A. R. L.G. F.J. C. |
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Affiliation: | aDepartment of Electronic Systems Engineering, Polytechnic School, University of São Paulo Av. Prof. Luciano Gualberto, 158, trav. 3, 05508-970, São Paulo, Brazil;bDepartment of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico, 1, 00133 Rome, Italy;cDepartment of Chemical Science and Technology, University of Rome Tor Vergata, via della Ricerca Scientifica, 1, 00133 Rome, Italy |
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Abstract: | The simultaneous use of different sensors technologies is an efficient method to increase the performance of chemical sensors systems. Among the available technologies, mass and capacitance transducers are particularly interesting because they can take advantage also from non-conductive sensing layers, such as most of the more interesting molecular recognition systems. In this paper, an array of quartz microbalance sensors is complemented by an array of capacitors obtained from a commercial biometrics fingerprints detector. The two sets of transducers, properly functionalized by sensitive molecular and polymeric films, are utilized for the estimation of adulteration in gasolines, and in particular to quantify the content of ethanol in gasolines, an application of importance for Brazilian market. Results indicate that the hybrid system outperforms the individual sensor arrays even if the quantification of ethanol in gasoline, due to the variability of gasolines formulation, is affected by a barely acceptable error. |
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Keywords: | Capacitive sensors Quartz microbalance Sensors fusion Gasoline quality |
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