Abstract
This paper presents the design and development of a passive wireless sensor forthe detection of bio-hazard materials and vapors using chemiresistive thin films.Composite polymer thin film with functionalized carbon nanotubes (f-CNT) andpolymethylmethacrylate (PMMA) is employed as a sensing material. It is investigated thatresistance change is determined with the concentration of dichloromethane vapors diffusedinto composite thin film, due to electrical transition from direct contact to tunneling incarbon nanotube nanojunctions. The chemiresistive film is integrated into a passive wirelesssystem which works based on the change in phase of the reflected RF signal.Measurement results of sensors in a wireless sensing system show a large differential phaseshift, which can be utilized for remote monitoring of bio-hazard vapors in realtime.
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