Abstract
• Cr 2 O 3 /SnO 2 nanofibers are prepared via a one-pot in situ electrospinning strategy. • Cr 2 O 3 /SnO 2 nanofibers exhibit excellent 3H-2B sensing properties. • The key to sensing improvement is the synergistic effect of heterojunction nanofibers. • Cr 2 O 3 /SnO 2 nanofibers show potential for 3H-2B gas sensing. 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-Cr 2 O 3 /n-SnO 2 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 °C, and the detection limit can be as low as 20 ppb. Moreover, the Cr 2 O 3 /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 Cr 2 O 3 and SnO 2 in nanofibers, providing a promising route to design high-efficient 3H-2B gas sensors for food safety.
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