Porous ZnFe_2O_4 nanorods with net-worked nanostructure for highly sensor response and fast response acetone gas sensor

摘要

Metal oxides with proper pore structure and tiny particle size can be utilized to gas sensor by promoting the diffusion and adsorbed quantity of target gas molecules. Herein, porous ZnFe_2O_4 nanorods with net-worked nanostructure were synthesized by a simple low-temperature hydrothermal strategy using the ZnFe_2(C_2O_4)_3 precursor as self-template. The images of electron microscopy obviously depicted the ZnFe_2O_4 size of primary particle is around 20 nm and abundant through pore structure. In addition, the N2 adsorption-desorption results indicate the specific surface area and the pore size are about 82.01 m2/g and 6.5 nm, respectively. Furthermore, the gas sensing properties of the porous ZnFe_2O_4 nanorods were illustrated in detail. Just as expected, the gas sensing measurement revealed that the as-prepared porous ZnFe_2O_4 nanorods as an acetone gas sensor exhibits high sensor response and fast response speed (the response/recovery time and sensor response of the gas sensor to 100 ppm acetone at 260℃ are 1/11 s and 52.8, respectively). The mechanism of gas sensing properties is discussed related to the large specific surface area, proper pore size and net-worked nanostructure.