In this work, Copper ferrite (CuFeO) gas sensitive material was decorated with polyoxometalate (POMs) electron acceptor. A group of CuFeO/POMs composite nanofibers with different amount of phosphotungstic acid (PW) were synthesized by simple and convenient electrospinning technique. The influence of POMs on gas-sensitive performance of ferrite was investigated for the first time. The result shows that the optimal response value toward 5 ppm NO gas is 2.63 with fast response/recovery, which is 4.7 times than pure CuFeO sensor. An ultra-low limit-of-detection of 12.86 ppb was also exhibited. The facilitation of sensing performance can be interpreted as the construction of CuFeO-PW n-n heterojunctions, which can help reduce carriers recombination and effectively separate electron-hole pairs. This paper introduces a new way of developing high sensitivity ferrite-based gas sensors by introducing polyoxometalates as electron acceptors.

中文翻译：

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改善多金属氧酸盐电子受体修饰的铁氧体铜纳米纤维的气敏性能，实现 ppb 级 NO2 检测

在这项工作中，铁氧体铜（CuFeO）气敏材料被多金属氧酸盐（POM）电子受体修饰。采用简单便捷的静电纺丝技术合成了一组不同磷钨酸（PW）含量的CuFeO/POMs复合纳米纤维。首次研究了POMs对铁氧体气敏性能的影响。结果表明，对5 ppm NO气体的最佳响应值为2.63，响应/恢复速度快，是纯CuFeO传感器的4.7倍。还表现出 12.86 ppb 的超低检测限。传感性能的促进可以解释为CuFeO-PW nn异质结的构建，有助于减少载流子复合并有效分离电子空穴对。本文介绍了一种通过引入多金属氧酸盐作为电子受体来开发高灵敏度铁氧体气体传感器的新方法。