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In this work, we designed and prepared CuO-loaded In 2 O 3 /CeO 2 nanofiber heterojunctions, which are promising for trace CO gas detection. We characterized the materials, confirmed the morphology of the nanofibers and structure of the p-n heterojunctions, and analyzed the effect of morphology and structure on the gas sensing performance. In gas sensing tests, the sensor is found to show a low optimum operating temperature of 70 °C, with a limit of detection that reaches as low as 50 ppb. At concentrations ranging from 50 ppb to 10 ppm, the sensor shows a sensitive and linear response for CO gas. In particular, the sensor shows a response (R a /R g) of 11.7–10 ppm CO gas, and a response/recovery time of 125 s/12 s for 2 ppm CO gas. In addition, we tested the selectivity, humidity response and long-term stability of the gas sensors. Finally, based on the structure of the materials, we propose a mechanism for the enhanced CO gas sensing performance. • CuO-loaded In 2 O 3 /CeO 2 nanofibers were synthesized for fabricating superior CO gas sensors. • CuO was loaded onto the surface of nanofibers to form p-n junctions, leading to enhanced sensing properties. • The CO gas sensor shows a low optimum operating temperature of 70 °C, with a limit of detection as low as 50 ppb. • Combined with the experimental results, the mechanism for the enhanced performance of the gas sensor is discussed. [ABSTRACT FROM AUTHOR]

In this work, we designed and prepared CuO-loaded In 2 O 3 /CeO 2 nanofiber heterojunctions, which are promising for trace CO gas detection. We characterized the materials, confirmed the morphology of the nanofibers and structure of the p-n heterojunctions, and analyzed the effect of morphology and structure on the gas sensing performance. In gas sensing tests, the sensor is found to show a low optimum operating temperature of 70 °C, with a limit of detection that reaches as low as 50 ppb. At concentrations ranging from 50 ppb to 10 ppm, the sensor shows a sensitive and linear response for CO gas. In particular, the sensor shows a response (R a /R g) of 11.7–10 ppm CO gas, and a response/recovery time of 125 s/12 s for 2 ppm CO gas. In addition, we tested the selectivity, humidity response and long-term stability of the gas sensors. Finally, based on the structure of the materials, we propose a mechanism for the enhanced CO gas sensing performance. • CuO-loaded In 2 O 3 /CeO 2 nanofibers were synthesized for fabricating superior CO gas sensors. • CuO was loaded onto the surface of nanofibers to form p-n junctions, leading to enhanced sensing properties. • The CO gas sensor shows a low optimum operating temperature of 70 °C, with a limit of detection as low as 50 ppb. • Combined with the experimental results, the mechanism for the enhanced performance of the gas sensor is discussed. [ABSTRACT FROM AUTHOR]