Journal
MATERIALS LETTERS
Volume 325, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2022.132856
Keywords
Semiconductors; Nanocomposites; Sensors; Electrospinning; Nanofibers
Funding
- Shandong Provincial Natural Science Foundation [ZR2018BEM035]
- National Natural Science Foundation of China [52173075]
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A new proposal for developing a highly sensitive 3H-2B gas sensor for real-time monitoring of Listeria monocytogenes (LM) in food is presented. The sensor, based on p-Cr2O3/n-SnO2 binary heterojunction nanofibers, shows excellent 3H-2B sensing performance with high selectivity and stability.
Listeria monocytogenes (LM) in food can release the 3-hydroxy-2-butanone (3H-2B) biomarker. Herein, a new proposal is presented to develop a highly sensitive 3H-2B gas sensor for the real-time monitoring of LM. This sensor is based on p-Cr2O3/n-SnO2 binary heterojunction nanofibers, which are obtained via a controllable process including electrospinning and calcination. The maximum response of as-built sensors to 5 ppm 3H-2B reaches 50 at 240?, and the detection limit can be as low as 20 ppb. Moreover, the Cr2O3/SnO(2 )sensor also exhibits a short response/recovery time (9 s/4 s), remarkable selectivity, and superb long-term stability. The excellent 3H-2B sensing performance is mainly ascribed to the p-n heterojunctions between Cr2O3 and SnO2 in nanofibers, providing a promising route to design high-efficient 3H-2B gas sensors for food safety.
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