Add time:07/16/2019         Source:sciencedirect.com

Porous core-shell PrFeO3-functionalized α-Fe2O3 nano-octahedrons were synthesized via a facile one-step hydrothermal method using a metal-organic framework as self-sacrificing template. The morphology, crystalline nature, chemical compositions and specific surface area of the as-prepared PrFeO3/α-Fe2O3 nano-octahedrons were comparatively studied by a variety of techniques, including SEM, TEM, XRD, XPS and BET. The experimental results show that the PrFeO3/α-Fe2O3 composite has a novel porous core-shell octahedral structure with a large specific surface area, which indicates that the material possesses more active sites to achieve a sufficient surface chemical reaction. Herein, the gas sensing properties of the α-Fe2O3 with different PrFeO3-functionalized levels were tested, which shows that the PrFeO3/α-Fe2O3 composite realized a high gas response, low optimum operating temperature and superior selectivity to ethyl acetate gas. The response (Rair/Rgas) of the sensor based on PrFeO3/α-Fe2O3 is 22.85 toward 100 ppm ethyl acetate at 206 °C, about 3 times higher than that of pristine α-Fe2O3 sensor. Besides, the sensor possesses a rapid response and recovery speed of 8 s and 9 s for detecting 100 ppm ethyl acetate. The enhanced gas sensing properties of PrFeO3/α-Fe2O3 composite could be attributed to the unique porous core-shell morphology and p-n heterostructure between PrFeO3 and α-Fe2O3.

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