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Description
The development of technologies to determine and control the quality of food has always been of great interest, as the freshness of food is directly related to our health. Especially in the recent coronavirus pandemic, the interest in health has increased dramatically, and as it has become common to receive food deliveries in quarantine, there has been a lot of investment in food freshness evaluation and abnormality detection technologies.
The hazardousness of food can be determined by taking samples of food and performing various tests in the laboratory. However, in the retail market, the freshness of food is traditionally judged subjectively by experienced people through smell and color. If we can determine the freshness of food using various electrical sensors, we will be able to determine the freshness of food more conveniently and quickly.
In this study, we implemented a semiconductor gas sensor that detects gases generated by food, and used the measured values from multiple sensors to determine the freshness. A sensor with high sensitivity is required to detect low concentrations of gas. To this end, we synthesized a reactant with a nanotube shape to increase the surface area of the reactant, and used it to realize a highly sensitive gas sensor.
The gas sensor uses SnO2 (Tin Oxide) as a reactant to detect hydrogen sulfide. The reactants with nano tube shape were synthesized by electrospinning and heat treatment process to realize the sensor.
The implemented gas sensor was used to measure the level of hydrogen sulfide generated by changes in the freshness of beef. It was experimentally verified that the freshness of beef can be determined based on the measured value.
This paper is the result of a study conducted with the support of BIG ISSUE PROJECT(PEO23010) of KITECH
References
[1] Y.J. Cho et al., Journal of Hazardous Materials, 423, 128671, 2022.
[2] I.C. Weber et al, Sensors and Actuators:B. Chemical, 356, 131346, 2022.
| Keywords | Gas sensor, metal oxide sensor, food freshness, H2S sensing |
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