标题：The effect of microstructure on the gas properties of NiFe2O4sensors: Nanotube and nanoparticle
作者：Zhang, Lei ;Jiao, Wanli
作者机构：[Zhang, Lei ;Jiao, Wanli ] School of Material Science and Engineering, Shandong University of Technology, Zibo, Shandong; 255049, China
来源：Sensors and Actuators, B: Chemical
摘要：Abstract To explore the effect of structure on gas properties of sensor, hollow nanotubes with the length of 1 μm and the diameter of 100 nm and nanoparticles of nickel ferrite had been synthesized by an effective anodic aluminum oxide (AAO) templates method and hydrothermal method, respectively. Phase composition, structural, morphology characters and specific surface area were measured using X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption-desorption isotherm analysis. The results indicated that the nanotubes and nanoparticles were consisted of pure NiFe2O4phase with homogenous size. The ammonia gas sensing properties of NiFe2O4nanotubes and nanoparticles based sensors were measured. Based on the results, nanotube gas sensors showed more favorable response than those of nanoparticle ones. And the nanotube gas sensor showed the best response in 100 ppm ammonia gas at 150 °C and favorable repeatability which was related to the higher specific surface area of special porous structure.
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