Abstract
In this work, surface acoustic wave (SAW) sensors with two types of polymer sensing films, polyethyleneimine (PEI) and polydimethylsiloxane (PDMS), containing embedded ZnO, TiO2, and WO3 nanoparticles (NPs) for detecting volatile organic compounds (VOCs) were produced and studied. The NPs were obtained using the pulsed laser ablation method, with the same deposition conditions used for all three materials studied. After incorporation of the NPs into the polymer, the suspension obtained was deposited using the airbrush method onto the quartz substrate of the sensor. Sensors were tested for four types of VOCs: Ethanol, toluene, acetone, and dichloroethane. Those based on PEI-sensitive films showed a superior sensitivity to those with PDMS. It was also found that the sensors with WO3 NPs had the best results for ethanol, acetone, and dichloroethane. The limit of detection (LOD) of the PEI/WO3 sensor was 6 ppm for ethanol, 15 ppm for acetone, and 9 ppm for dichloroethane. For toluene, the best response was obtained using the PEI/ZnO sensor, which produced a LOD of 9 ppm.
Highlights
Human health, a subject of great interest to our society today, depends to a large extent on the quality of the environment
Some types of materials used in surface acoustic wave (SAW)-sensor-sensitive films are oxides, polymers, and composites consisting of nanoparticles (NPs) embedded in polymers [9,11,12,13,14,15,16]
This paper describes the fabrication of SAW sensors for the detection of volatile organic compounds (VOCs)
Summary
A subject of great interest to our society today, depends to a large extent on the quality of the environment. A number of these diseases can be prevented In this context, the development of sensors capable of detecting substances harmful to the human body at ambient temperatures is currently a field of considerable importance. Volatile organic compounds (VOCs) are part of a class of carbon-based chemical substances that volatilize very at room temperature and pressure They enter the atmosphere through industrial processes, building materials, household or personal cleaning products, cosmetics, paints, varnishes, and waxes, etc. Some types of materials used in SAW-sensor-sensitive films are oxides, polymers, and composites consisting of nanoparticles (NPs) embedded in polymers [9,11,12,13,14,15,16]. The role of NPs in determining the performance of sensors, namely with regard to their frequency shift, sensitivity, and limit of detection (LOD), was investigated
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