Abstract
Erythrocyte-like hierarchical α-Fe2O3/Bi2WO6 nanocomposites were synthesized by a simple and convenient hydrothermal method. The composites were assembled from α-Fe2O3/Bi2WO6 nanoplates. The structures of α-Fe2O3/Bi2WO6 nanocomposites were characterized by XRD, TEM, BET and gas sensing properties toward xylene were investigated in detailed. The sensors based on self-assembled α-Fe2O3/Bi2WO6 nanoplates show much enhanced sensing performances to xylene than that of pure Bi2WO6. The sensing performance using 10 wt% α-Fe2O3/Bi2WO6 reaches the highest response (S = 13.5) for the detection of 100 ppm xylene. Significant enhancement of the response and selectivity to xylene can be attributed to the formation of heterostructure and the synergistic catalytic activity from α-Fe2O3 and surface decorated WO4 2–.
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