Construction of 1D/2D α-Fe2O3/SnO2 Hybrid Nanoarrays for Sub-ppm Acetone Detection

摘要

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-Fe2O3/SnO2 hybrid nanoarrays (HNAs),where one-dimensional (1D) FeOOH nanorods are in situ grown on the prefabricated 2D SnO2 nanosheets for on-chip construction of 1D/2D HNAs.After annealing in air,ultrafine α-Fe2O3 nanorods are homogenously distributed on the surface of SnO2 nanosheet arrays (NSAs).Gas sensing results show that the α-Fe2O3/SnO2 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 SnO2 NSAs (1.16 at 0.4 ppm) and pure α-Fe2O3 nanorods (1.03 at 0.4 ppm),at an operating temperature of 340℃.The enhanced acetone sensing performance may be attributed to the formation of α-Fe2O3-SnO2 n-n heterostructure with 1D/2D hybrid architectures.Moreover,the α-Fe2O3/SnO2 HNAs also possess good reproducibility and selectivity toward acetone vapor,suggesting its potential application in breath acetone analysis.