Abstract
Heterogenous SnO2@Fe2O3 core-shell triple-layer boxes (TBs) are successfully prepared through using a combination of room-temperature hydrolyzation and annealing treatment on SnO2 double-layer boxes (DBs). The crystallinity, morphology, and microstructure of as-prepared SnO2@Fe2O3 TBs are detailedly characterized. Compared with those of referenced pristine SnO2 or Fe2O3 nanostructures, the overall cubic configuration of heterogeneous SnO2@Fe2O3 with hollow interiors retains largely unaltered. Meanwhile, sensor based on SnO2@Fe2O3 samples synthesized with Fe2O3/SnO2 mole ratio of 1 exhibit superior response, excellent selectivity, shortened response-recovery time, and good long-time stability for formaldehyde (HCHO). It has the highest response (11.72) with the response/recovery time of 4 s/19 s to 50 ppm HCHO, respectively, and a low detection limit (1.07 to 200 ppb) for targeted HCHO under the optimal operating temperature (220 °C). The high absorption ability based on unique structural merits of hierarchically SnO2/Fe2O3 subunit-assembled porous multilayers and synergistic effect of SnO2/Fe2O3 heterojunction may contribute to their excellent HCHO sensing performance.
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