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Brush-like α-Fe 2 O 3 -ZnO heterostructures were synthesized through a sputtering ZnO seed-assisted hydrothermal growth method. The resulting heterostructures consisted of α-Fe 2 O 3 rod templates and ZnO branched crystals with an average diameter of approximately 12 nm and length of 25 nm. The gas-sensing results demonstrated that the α-Fe 2 O 3 -ZnO heterostructure-based sensor exhibited excellent sensitivity, selectivity, and stability toward low-concentration NO 2 gas at an optimal temperature of 300 °C. The α-Fe 2 O 3 -ZnO sensor, in particular, demonstrated substantially higher sensitivity compared with pristine α-Fe 2 O 3 , along with faster response and recovery speeds under similar test conditions. An appropriate material synergic effect accounts for the considerable enhancement in the NO 2 gas-sensing performance of the α-Fe 2 O 3 -ZnO heterostructures.

Enhanced Sensing Ability of Brush-Like Fe2O3-ZnO Nanostructures towards NO2 Gas via Manipulating Material Synergistic Effect