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

ABSTRACT: 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 ?-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 ?-Fe2O3 nanorods are homogenously distributed on the surface of SnO2 nanosheet arrays (NSAs). Gas sensing results show that the ?-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 ?-Fe2O3 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 ?-Fe2O3-SnO2 n-n heterostructure with 1D/2D hybrid architectures. Moreover, the ?-Fe2O3/SnO2 HNAs also possess good reproducibility and selectivity toward acetone vapor, suggesting its potential application in breath acetone analysis.

SUBMITTER: Gong H 

PROVIDER: S-EPMC7040428 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature