Multivariable passive RFID vapor sensors: Pilot-scale manufacturing and laboratory evaluation

We have developed a new concept in passive radio frequency identification (RFID) sensors for selective vapor detection and demonstrated roll-to-roll manufacturing of these sensors on a flexible polymeric substrate on the pilot scale. Selectivity of sensors was tested using model analyte vapors and is provided by measurements of the resonance impedance spectra, multivariate analysis of spectral features, and correlation of these spectral features to the concentrations of vapors. This RFID sensing concept features 16-bit resolution provided by the sensor reader, granting a highly desired independence from costly proprietary RFID memory chips with an analog input.