engleski

Radio Frequency Tag for Distributed Wireless Conductometric Sensing Applications

The integration of chemical and biosensor technologies with wireless devices has application in healthcare, personal care, environmental monitoring, process and quality control, and chemical and biological threat detection. Our present work is aimed at developing and integrating conductometric type sensors onto a wireless platform that could be used for distributed sensing applications. We have developed CNTag, a wireless chemical sensor platform based on the ISO standard Radio-Frequency IDentification (RFID) protocol. It is the combination of a conductometric transducer with an RFID processor into a credit-card sized device [fig. 1]. CNTag could be deployed as a stand-alone chemical sensor, or as a node in a wireless sensor network (WSN). Figure 1. A conductometric transducer and radio-frequency identification (RFID) processor on a credit-card sized tag, known as CNTag Thin films of the organic semiconducting polymer, Poly(3, 4-ethylenedioxythiophene) poly(styrenesulfonate), or PEDOT-PSS, were coated by spin-coating onto gold electrode structures on planar substrates to produce various different conductometric transducer discs [fig. 2]. PEDOT/PSS is a p-type organic semiconductor that can be reversibly doped and de-doped by the addition or removal of cations. The change in cation doping level modulates the conductance of the polymer thin film over several orders of magnitude, and this effect may be exploited to make highly sensitive chemical sensors.

RFID; chemical sensor; conducting polymer; conductometric; thin film; wireless sensor network

nije evidentirano