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Ratiometric info-chemical communication system based on polymer-coated surface acoustic wave microsensors
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Yang, J., Racz, Z., Gardner, J. W., Cole, Marina and Chen, H. (2012) Ratiometric info-chemical communication system based on polymer-coated surface acoustic wave microsensors. Sensors and Actuators B: Chemical, Vol. 173 . pp. 547-554. doi:10.1016/j.snb.2012.07.043 ISSN 0925-4005.
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Official URL: http://dx.doi.org/10.1016/j.snb.2012.07.043
Abstract
A novel ratiometric info-chemical communication system has been developed that is based upon an array of four surface acoustic wave (SAW) resonator microsensors operating at a frequency of 262 MHz and under ambient conditions. The info-chemical mixtures were generated by a micro-evaporator and transported to the SAW sensors inside a flow chamber. Binary mixtures of 3-methylbutan-1-ol and ethyl acetate were used to demonstrate the principle of encoding and decoding different ratios of volatile info-chemicals in this system. The resonant frequencies of the four polymer-coated SAW sensors and the associated reference (uncoated) SAW sensors were used to determine differential responses corresponding to the different ratiometric mixtures of the info-chemicals. The SAW sensors were spray coated with four different stationary phase polymer compounds, namely polycaprolactone, polyvinylcarbazole, polystyrene-co-butadiene, and polyethylene-co-vinylacetate. Principal components analysis was performed on both steady-state and dynamic features extracted from the sensor responses. Our results show clear linear separability of the different chemical ratios as distinct clusters in multi-variate space. In conclusion, we believe that this is the first demonstration of the encoding, transmitting, and decoding ratiometric information using a system based upon an array of SAW-based microsensors. This novel info-chemical communication system, based upon fixed ratios, transmits chemical information over distances that would otherwise be impossible using absolute concentrations.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
| Journal or Publication Title: | Sensors and Actuators B: Chemical | ||||
| Publisher: | Elsevier Science BV | ||||
| ISSN: | 0925-4005 | ||||
| Official Date: | October 2012 | ||||
| Dates: |
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| Volume: | Vol. 173 | ||||
| Page Range: | pp. 547-554 | ||||
| DOI: | 10.1016/j.snb.2012.07.043 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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