LAUSR

3D Fe2(MoO4)3 microspheres were prepared by hydrothermal method with polyethylene glycol (PEG) assisted. The structure, morphology and crystal phase of the 3D Fe2(MoO4)3 microspheres samples were characterized by X-ray power diffraction and scanning electron microscopy. The 3D Fe2(MoO4)3 microspheres were composed of nanosheets. The diameter of 3D Fe2(MoO4)3 microsphere and thickness of nanosheets were controlled by the molecular weight of PEG. The size of microsphere decreased with the molecular weight increase, the Fe2(MoO4)3 microspheres prepared with PEG-2000 showed the minimum mean diameter of 17.8 μm and nanosheets thickness of 65 nm. The sensors based on the hierarchical 3D Fe2(MoO4)3 exhibited excellent gas sensing performances, which showed high response to n-butanol at low operating temperature and high response to acetone at relatively high operating temperature. The highest responses of sensor were 5.7 and 3.4 to 1 ppm n-butanol and acetone at corresponding optimum working temperature. The Fe2(MoO4)3 microspheres have a potential application in n-butanol and acetone detection, and it can be applied in diabetes diagnosis due to good low concentration response to acetone.