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Exhaled acetone is one of the representative biomarkers for the noninvasive diagnosis of type-1 diabetes. In this work, we have applied a facile two-step chemical bath deposition method for acetone sensors based on  α -Fe 2 O 3 /SnO 2  hybrid nanoarrays (HNAs), where one-dimensional (1D) FeOOH nanorods are in situ grown on the prefabricated 2D SnO 2  nanosheets for on-chip construction of 1D/2D HNAs. After annealing in air, ultrafine  α -Fe 2 O 3  nanorods are homogenously distributed on the surface of SnO 2  nanosheet arrays (NSAs). Gas sensing results show that the  α -Fe 2 O 3 /SnO 2  HNAs exhibit a greatly enhanced response to acetone (3.25 at 0.4 ppm) at a sub-ppm level compared with those based on pure SnO 2  NSAs (1.16 at 0.4 ppm) and pure  α -Fe 2 O 3  nanorods (1.03 at 0.4 ppm), at an operating temperature of 340°C. The enhanced acetone sensing performance may be attributed to the formation of  α -Fe 2 O 3 –SnO 2  n-n heterostructure with 1D/2D hybrid architectures. Moreover, the  α -Fe 2 O 3 /SnO 2  HNAs also possess good reproducibility and selectivity toward acetone vapor, suggesting its potential application in breath acetone analysis.

Construction of 1D/2D α -Fe 2 O 3 /SnO 2 Hybrid Nanoarrays for Sub-ppm Acetone Detection

Construction of 1D/2D α -Fe ₂ O ₃ /SnO ₂ Hybrid Nanoarrays for Sub-ppm Acetone Detection