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Proceedings Paper

Nanowire sensor applications based on radio frequency phase shift in coplanar waveguide
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Paper Abstract

This paper presents the design and development of a gas sensor based on phase monitoring of reflected waves at radio frequencies for various dichloromethane vapors. Composite thin film with functionalized carbon nanotubes (f-CNT) and polymethylmethacrylate (PMMA) was employed as a sensing material on a coplanar waveguide and its impedance was monitored for various concentrations. Conductivity change of the composite due to absorption of dichloromethane vapors was clearly observed by resistance measurements. When the f-CNTs/PMMA composite is exposed to dichloromethane with low vapor concentration, phase monitoring of reflected waves from resistive load exhibited higher sensitivity than resistance measurements. With high sensitivity at radio frequency, a wireless gas sensing network integrated with power divider and antenna is introduced.

Paper Details

Date Published: 29 July 2004
PDF: 7 pages
Proc. SPIE 5389, Smart Structures and Materials 2004: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (29 July 2004); doi: 10.1117/12.548434
Show Author Affiliations
Hargsoon Yoon, The Pennsylvania State Univ. (United States)
Biju Philip, The Pennsylvania State Univ. (United States)
Jining Xie, The Pennsylvania State Univ. (United States)
Taeksoo Ji, The Pennsylvania State Univ. (United States)
Vijay K. Varadan, The Pennsylvania State Univ. (United States)


Published in SPIE Proceedings Vol. 5389:
Smart Structures and Materials 2004: Smart Electronics, MEMS, BioMEMS, and Nanotechnology
Vijay K. Varadan, Editor(s)

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