فهرست نشریات علمی دسترسی آزاد ایران

A ZnBi2O4 nano-sensor was synthesized using a facile one-step solid-state method at 650 ˚C for 10 h. Rietveld analysis data confirmed that ZnBi2O4 crystallized as the main phase in the orthorhombic crystal system with Pmmm space group. Field emission scanning electron microscope (FESEM) images showed that the nanocomposites had a particle morphology. Ultraviolet – visible (UV-Vis) spectroscopy data indicated that the direct band-gap energies (Eg) of the as-synthesized materials decreased upon metal-ion doping  into the crystal lattice. Magnetic hysteresis curves demonstrated that the obtained nanomaterials had ferromagnetic behavior and no preferred direction in magnetization was found for the synthesized samples. The ammonia gas-sensing behavior of the obtained ZnBi2O4 was evaluated under exposure to various concentrations of ammonia gas with Au-patterned contact electrodes. The detection limit for NH3 was 10 ppb. The results showed that the obtained ZnBi2O4 nanofiber exhibited good sensitivity at 200 ºC to low concentrations of ammonia which can be potentially utilized as a resistive gas sensor.