Abstract
This paper presents the feasibility of a fully inkjet-printed, microwave flexible gas sensor based on a resonant electromagnetic transducer in microstrip technology and the impact of the printing process that affects the characteristics of the gas sensor. The sensor is fabricated using silver ink and multi-wall carbon nanotubes (MWCNTs) embedded in poly (3,4-ethylenedioxythiophene) polystyrene (PEDOT: PSS-MWCNTs) as sensitive material for Volatile Organic Compounds (VOCs) detection. Particular attention is paid to the characterization of the printed materials and the paper substrate. The manufacturing process results in a change in relative permittivity of the paper substrate by nearly 20%. Electrical characterization, made in the presence of gas, validates our theoretical approach and the radiofrequency (RF) gas sensor proof of concept.
Highlights
Atmospheric pollution involves several particles and mixture into complex gases, such as volatile organic compounds (VOCs), where concentration is usually detected in the range of parts per million for health and environmental applications
1, we offer a chemical gas sensor that is fully inkjet printed on monitor a flexible paper substrate
The sensor is composed of silver ink as conductive material and PEDOT: PSS-multi-wall carbon nanotubes (MWCNTs) as sensitive material
Summary
Atmospheric pollution involves several particles and mixture into complex gases, such as volatile organic compounds (VOCs), where concentration is usually detected in the range of parts per million (ppm) for health and environmental applications. Most of the commercially available sensors are based on conductivity transduction, using metal oxides as a sensitive layer [1,2,3]. Such sensors often operate at high temperatures [4]. Several studies have been conducted on the design of radiofrequency (RF) gas sensors in recent years and a large part of these studies converge to the use of carbon nanotubes as a sensitive element. Various studies have been carried out in recent years, showing the modification of the conductivity of carbon nanotubes and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS) in the presence of alcohols [6,7,8,9]
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