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16 May 2005 Nanowire sensor array for wireless detection and identification of bio-hazards
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This paper presents the design and development of passive wireless sensors for bio-hazard vapors in wireless sensing network, based on reflected-wave phase monitoring. Composite thin film with functionalized carbon nanotubes (f-CNT) and polymethylmethacrylate (PMMA) is employed as a sensing material on a coplanar waveguide. Resistance increase with absorption of dichloromethane gas into composite thin film is observed by resistance measurement. Phase measurement of reflected wave from resistive loads demonstrates high sensitivity using a network analyzer. Based on the radio frequency characteristics, wireless gas sensing network integrated with a circulator and two antennae is tested. Measurement results of sensors and reference loads using the wireless sensing network shows large differential phase shifts which is sufficient to monitor bio-hazards material in real-time with high sensitivity.
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Hargsoon Yoon, Biju Philip, Jose K. Abraham, Taeksoo Ji, and Vijay K. Varadan "Nanowire sensor array for wireless detection and identification of bio-hazards", Proc. SPIE 5763, Smart Structures and Materials 2005: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (16 May 2005);

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