Construction of 1D/2Dα-Fe_(2)O_(3)/SnO_(2)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 onα-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,ultrafineα-Fe_(2)O_(3) nanorods are homogenously distributed on the surface of SnO_(2) nanosheet arrays(NSAs).Gas sensing results show that theα-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 pureα-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 ofα-Fe_(2)O_(3)-SnO_(2) n-n heterostructure with 1D/2D hybrid architectures.Moreover,theα-Fe_(2)O_(3)/SnO_(2) HNAs also possess good reproducibility and selectivity toward acetone vapor,suggesting its potential application in breath acetone analysis.