期刊
IEEE SENSORS JOURNAL
卷 18, 期 21, 页码 8893-8901出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2018.2867208
关键词
Breath sensor; graphene oxide; RFID technology; skin antenna; wireless monitoring
资金
- Lazio Innova, Program Research Teams 2017, Project: SECOND SKIN
Real-time and comfortable monitoring of the human breathing could allow identifying anomalies in the rhythm and waveform to be correlated with several pathologic disorders of respiratory and cardiovascular systems. A wireless sensor based on a flexible Kapton substrate, suitable to be stuck over the face skin like a plaster and provided with a graphene-oxide (GO) electrode, is here proposed for application to the monitoring of the moisture emitted during inhalations and exhalations. The GO-based electrode increases its dc resistance when exposed to humidity with a sensitivity of 60 Omega/RH. The device is compatible with the radiofrequency identification (RFID) standard in the UHF band. When used in battery-less mode, it can be read up to 60 cm. The RFID sensor has been successfully experimented in a measurement campaign involving 10 volunteers asked to reproduce a set of predefined normal and pathological breaths. The resulting resistance traces permit to well clusterize the breath patterns with respect to the respiration rate (extracted by a fast Fourier transform) and to the average peak variation of the sensor's resistance with an accuracy close to 90%.
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