Enhanced acetone sensing performance of the ZnFe2O4/SnO2 nanocomposite
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ZnFe2O4/SnO2 semiconductor nanocomposites with various mole ratios were prepared by a simple chemical synthesis process that based on sol–gel method. The structural properties were determined by X-ray diffraction and scanning electron microscope technique. The XRD study reveals that no impurity phase, such as ZnO, Fe2O3, existed in all the samples. The average grain size was found to be about 39.51 nm when the mole ratio of ZnFe2O4/SnO2 is 2:1 (Z2S1), which is benefit for improving gas sensing property. The Z2S1 sample showed a relatively higher response (11.46) at a lower working temperature (176 °C) to acetone compared with other composites, and the response/recovery time were both very short. The improving gas sensing properties may be due to the fine grain and the formation of the ZnFe2O4/SnO2 heterojunction structure.
This work was supported by National Natural Science Foundation of China (NSFC) (No.51602214, No.11604234 and No.11404236), Natural Science Foundation of Shanxi Province (No. 201601D202010).