Detection of Volatile Organic Compounds Using Microwave Sensors

Author

Zarifi, Mohammad Hossein ; Sohrabi, A. ; Shaibani, Parmiss Mojir ; Daneshmand, Mojgan ; Thundat, Thomas

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB, Canada

Volume

15

Issue

1

fYear

2015

fDate

Jan. 2015

Firstpage

248

Lastpage

254

Abstract

A microwave (MW)-based sensing platform for detection of acetone vapor is demonstrated. The sensing platform comprises of an MW resonator coated with a thin layer of polydimethylsiloxane (PDMS) that acts as a sorbent layer for acetone. Absorption-induced swelling of PDMS changes the permittivity and results in reproducible variations in the resonance frequency of the resonator. Here, we demonstrate the detection of acetone, as the model analyte, with the concentrations of 0-265 ppt. In addition, since the technique is based on electromagnetic fields spilling into space, we show the ability of the sensor to detect acetone in a noncontact fashion.

Keywords

chemical variables measurement; coatings; gas sensors; microwave detectors; microwave resonators; organic compounds; polymers; MW resonator; MW-based sensing platform; PDMS; absorption-induced swelling; acetone vapor detection; coating; electromagnetic field; microwave-based sensing platform; model analyte; polydimethylsiloxane; sorbent layer; volatile organic compound detection; Capacitance; Microwave theory and techniques; Permittivity; Plastics; Resonant frequency; Temperature sensors; Microwave resonator; PDMS swelling; resonance frequency;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2014.2345477

Filename

6887295