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

Hargsoon Yoon; Biju Philip; Jining Xie; Taeksoo Ji; Vijay K. Varadan

doi:10.1117/12.548434

29 July 2004 Nanowire sensor applications based on radio frequency phase shift in coplanar waveguide

Hargsoon Yoon, Biju Philip, Jining Xie, Taeksoo Ji, Vijay K. Varadan

Proceedings Volume 5389, Smart Structures and Materials 2004: Smart Electronics, MEMS, BioMEMS, and Nanotechnology; (2004) https://doi.org/10.1117/12.548434
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

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.

Citation Download Citation

Hargsoon Yoon, Biju Philip, Jining Xie, Taeksoo Ji, and Vijay K. Varadan "Nanowire sensor applications based on radio frequency phase shift in coplanar waveguide", Proc. SPIE 5389, Smart Structures and Materials 2004: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (29 July 2004); https://doi.org/10.1117/12.548434

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