Title :
RFID Passive Gas Sensor Integrating Carbon Nanotubes
Author :
Occhiuzzi, Cecilia ; Rida, Amin ; Marrocco, Gaetano ; Tentzeris, Manos
Author_Institution :
Dipt. di Inf., Sist. e Produzione (DISP), Univ. of Rome Tor Vergata, Rome, Italy
Abstract :
Carbon nanotube (CNT) composites are sensitive to the presence of gases due to their high surface-to-volume ratio and hollow structure that are well suited for gas molecule absorption and storage. Such sensing capability is here integrated with UHF RF identification (RFID) technology to achieve passive and low-cost sensors, remotely readable. CNT film (buckypaper) is used as a localized variable resistive load integrated into a tag antenna, which becomes able to transduce the presence of hazardous gas in the environment, ammonia in this case, into a change of its electromagnetic features. The dynamic range and the hysteresis of the radio sensor are investigated by simulations, equivalent circuits, and articulated experimentations within a true RFID link, providing the proof of concept and some guidelines for tag design.
Keywords :
UHF antennas; carbon nanotubes; equivalent circuits; gas sensors; radiofrequency identification; C; CNT composites; RFID passive gas sensor; UHF RF identification technology; carbon nanotube composite; electromagnetic features; equivalent circuits; gas molecule absorption; high surface-to-volume ratio; hollow structure; localized variable resistive load; low-cost sensors; radio sensor; tag antenna; Antenna measurements; Antennas; Conductivity; Gas detectors; Impedance; Radiofrequency identification; Nanotube; RF identification (RFID); passive gas sensor;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2011.2163416
