Journal
ANALYTICAL CHEMISTRY
Volume 89, Issue 3, Pages 1697-1703Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.6b03901
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Funding
- Ministry of Economy and Competitiveness (Spain) [CTQ2013-44545-R]
- Junta de Andalucia [P10-FQM-5974]
- European Regional Development Funds (ERDF)
- Spanish Ministry of Education, Culture and Sport (MECD) [FPU13/05032]
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In this work we present a full-passive flexible multigas sensing tag for the determination of oxygen, carbon dioxide, ammonia, and relative humidity readable by a smartphone. This tag is based on near field communication (NFC) technology for energy harvesting and data transmission to a smartphone. The gas sensors show an optic response that is read through high-resolution digital color detectors. A white LED is used as the common optical excitation source for all the sensors. Only a reduced electronics with very low power consumption is required for the reading of the optical responses and data transmission to a remote user. An application for the Android operating system has been developed for the power supplying and data reception from the tag. The responses of the sensors have been calibrated and fitted to simple functions, allowing a fast prediction of the gases concentration. Cross-sensitivity has also been evaluated, finding that in most of the cases it is negligible or easily correctable using the rest of the readings. The election of the target gases has been due to their importance in the monitoring of modified atmosphere packaging. The resolutions, and limits of detection measured are suitable for such kinds of applications.
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