Abstract
Passive RFID sensors are capable of detecting a number of volatile organic compound vapors dependent upon the solubility parameters of the solvent and their vapor pressure.
Highlights
Previous work on Radio Frequency Identification (RFID) sensors has seen the incorporation of stimulus responsive materials into a range of antenna designs with a significant number of these in recent years being passive.[5]
The feed loop was inkjet printed with silver nanoparticle dispersion ink onto a PDMS block, the RFID transponder chip was connected to the loop and the feed PDMS was mounted on the antenna circuit board
A PDMS substrate with a printed loop was placed onto an FR4 board to hold it in place, whilst each terminal of the loop was Antenna design for Ultra-High Frequency (UHF) RFID tags is highly dependent on the tuning of the tag antenna and transponder chip impedances
Summary
Previous work on RFID sensors has seen the incorporation of stimulus responsive materials into a range of antenna designs with a significant number of these in recent years being passive.[5]. In contrast we propose a disposable passive RFID sensor system in the UHF band for a long read range, typically several metres, which is sensitive to a broad range of vapours utilizing a stimuli-responsive polymer substrate but where the stimuliresponse is mechanical. This is similar in principle to the sensor mechanism as described by Fiddes and Yan[16] but rather than measuring small differences in conductivity, the system we describe behaves as an on–off switch where electrical conductivity in an antenna component is essentially stopped by a mechanical response from the substrate. This indicates a step towards developing an entirely printed tag, but results in a system where the tag can be used repeatedly whilst maintaining a clear RFID response to vapour environments
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