Novel gaseous phase ethanol sensor implemented with underloaded RF resonator for sensor-embedded passive chipless rfids

Author

Chen, W.T. ; Stewart, K.M.E. ; Carroll, John ; Mansour, Raafat ; Abdel-Rahman, Eihab ; Penlidis, A.

Author_Institution

Centre of Integrated RF Eng. (CIRFE), Univ. of Waterloo, Waterloo, ON, Canada

fYear

2013

fDate

16-20 June 2013

Firstpage

2059

Lastpage

2062

Abstract

This paper presents a novel gaseous phase ethanol resonant sensor implemented with underloaded LC-resonator. The device exhibits large variations in S₁₁ and Group Delay under ethanol exposures. By operating the OV-225 and OV-275 polymer-coated chemi-capacitors at RF frequencies, the E-field confined around the conductor surface sees a maximized polymer exposure surface, thereby improving both the response time and sensitivity. Under exposures of various ethanol concentrations, the OV-225 sensor showed a transient response time constant of ~60s, an frequency shift of 24.5MHz, and respective S₁₁ and Group Delay sensitivities of 3.12e-2 mdB/ppm and 9.49e-2 ps/ppm across the 0-5000ppm ethanol concentration span; the OV-275 version exhibited transient time constant of ~30s, a frequency shift of 22.5MHz, an S₁₁ and Group Delay sensitivities of 3.71e-1 mdB/ppm and 1.94 e-1 ps/ppm, respectively.

Keywords

capacitors; gas sensors; organic compounds; polymers; radiofrequency identification; resonators; Oν-225 polymer coated chemicapacitor; Oν-225 sensor; Oν-275 polymer coated chemicapacitor; S₁₁ sensitivity; conductor surface; e-field; ethanol concentration exposure determination; frequency 22.5 MHz; frequency 24.5 MHz; gaseous phase ethanol resonant sensor; group delay sensitivity; polymer exposure surface maximization; sensor embedded passive chipless RFID; transient response time constant; underloaded RF resonator; Delays; Ethanol; Polymers; Radio frequency; Resonant frequency; Sensitivity; Time factors; Chemical sensors; gas detectors; radiofrequency identification; resonator filters; thin film sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), 2013 Transducers & Eurosensors XXVII: The 17th International Conference on

Conference_Location

Barcelona

Type

conf

DOI

10.1109/Transducers.2013.6627204

Filename

6627204