CuCrO2 /Cr2O3 heterojunction gas sensor for low-temperature and high response H2S detection and applied for meat freshness evaluation
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Hydrogen sulfide (H 2 S) is a highly toxic and flammable gas that is also an important indicator of meat spoilage. Therefore, real-time and accurate detection of H 2 S concentration is essential to ensure environmental safety and human health. Despite its significance, achieving highly sensitive detection of H 2 S gases at low temperatures remains a formidable challenge. In this study, we used the biomass template method to controllably prepare CuCrO 2 -doped Cr 2 O 3 p-p heterojunction hollow tubes. Among them, the 10.93 wt% Cu-doped Cr 2 O 3 sensing material (Cu-Cr 2 O 3 -3) obtained by calcination at 500 o C has a good overall gas-sensing performance to H 2 S gas. It has a response value of up to 441.2 for 100 ppm H 2 S gas at 92 o C, as well as good selectivity, low detection limit (Rg/Ra = 1.63@50 ppb) and humidity resistance. Meanwhile, the reasons for the performance differences between the 5 composites were explored in detail by using various characterisation methods. The gas sensing mechanism of the Cu-Cr 2 O 3 -3 sensor was also analysed by combining MS, XPS and ‘quasi-in-situ’ Raman spectrum. In addition, we carried out experiments on the freshness detection of pork and shrimp by the Cu-Cr 2 O 3 -3 sensor, confirming its potential application in meat freshness evaluation.
