Abstract
simple approach to develop a novel photosensitive
radio-frequency (RF) tag to be used as non-volatile
wireless light exposure detector is presented. This
chipless tag is based on the coupling of a standard high
frequency (HF) inductor-capacitor (LC) resonator with an
interdigitated planar sensor featuring a micrometric
inter-electrode gap optimized for a thin acrylamide
photosensitive polymer layer. Exposure to ambient light
within the absorbance band of the photosensitizer (~530
nm) triggers polymerization, which irreversibly modifies
the electrical properties of the film, producing a
significant decrease of the dielectric constant of 27%,
thereby changing the resonance frequency (540 kHz shift)
of the resonator. This allows the straightforward
wireless detection of the light exposure event as
demonstrated here. The sensor fabrication is fully
compatible with high-throughput printing processes,
therefore fostering a dramatic reduction of tag
production costs and enabling mass application of
disposable tags that can, for instance, be embedded into
the packaging of light-sensitive goods.
Original language | English |
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Pages (from-to) | 839-845 |
Journal | Sensors and Actuators B: Chemical |
Volume | 223 |
DOIs | |
Publication status | Published - 2016 |
MoE publication type | A1 Journal article-refereed |
Keywords
- photopolymers
- photosensitivity
- photosensitizers
- radio frequency identification RFID
- radio waves
- resonators
- throughput
- high frequency HF
- interelectrode gaps
- light exposure
- photosensitive polymers
- resonance frequencies
- sensor fabrication
- wireless detection
- wireless sensor