Abstract
This work describes the electrochemical performance of a novel sensor based on two-dimensional ZnO and activated by the plasmonic effect to calculate the ethanol content in bio-alcohol samples. The ZnO was prepared in a coffee extract at 90 °C. XRD and TEM showed the formation of hexagonal phase ZnO and its two-dimensional morphology, respectively. The sensor was formed by depositing the semiconductor on a sterling silver sheet. The sensor was immersed in 1 M KOH at 25 °C and illuminated with visible light to produce the plasmonic effect. The electrochemical analysis showed that the plasmonic effect activated the complex redox reactions of ethanol/CO2. A Figure of Merit of the sensor was proposed to obtain the calibration curve and calculate the molar concentration of ethanol in four bio-alcohol samples obtained from artisanal production. The accurate content of ethanol in each sample was measured by gas chromatography and was compared with the calculated values. The results show the feasibility of using sensors activated by the plasmonic effect to calculate the ethanol content in alcohols.
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