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Proceedings Paper

Nanowire sensor array for wireless detection and identification of biohazards
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Paper Abstract

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.

Paper Details

Date Published: 16 May 2005
PDF: 7 pages
Proc. SPIE 5763, Smart Structures and Materials 2005: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (16 May 2005); doi: 10.1117/12.608145
Show Author Affiliations
Hargsoon Yoon, Univ. of Arkansas (United States)
Biju Philip, Univ. of Arkansas (United States)
Jose K. Abraham, Univ. of Arkansas (United States)
Taeksoo Ji, Univ. of Arkansas (United States)
Vijay K. Varadan, Univ. of Arkansas (United States)


Published in SPIE Proceedings Vol. 5763:
Smart Structures and Materials 2005: Smart Electronics, MEMS, BioMEMS, and Nanotechnology
Vijay K. Varadan, Editor(s)

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