251. Design of highly sensitive and selective xylene gas sensor based on Ni-doped MoO3 nano-pompon
- Author
-
Peng Sun, Geyu Lu, Xu Yan, Xiaohong Chuai, Wenhao Jiang, Lingling Meng, Sufang Zhang, Zhijie Zhou, Fangmeng Liu, and Changhua Hu
- Subjects
Materials science ,Doping ,Xylene ,Metals and Alloys ,Analytical chemistry ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Field emission microscopy ,chemistry.chemical_compound ,chemistry ,Transmission electron microscopy ,Phase (matter) ,Nano ,Materials Chemistry ,Electrical and Electronic Engineering ,0210 nano-technology ,Selectivity ,Instrumentation ,Powder diffraction - Abstract
MoO3 gas-sensing materials with different Ni2+ doping concentration were prepared by a simple one-step solvothermal method. The phase structure, micro-structure and morphology of the as-prepared samples were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscope (FESEM) and the transmission electron microscope (TEM) etc., respectively. The morphology can be changed by adjusting the doping concentration of Ni2+. Among them, the 5 mol% Ni-doped MoO3 sample with a pompon-like morphology improved gas accessibility significantly. Prominently, the response of the sensors on xylene was increased 18 times from 3.48 to 62.6, the response time was about 1 s and the best selectivity was obtained at the optimum temperature of 250 °C. These breakthroughs are attributed to the increase of surface-active sites and the improvement of micro-morphology caused by Ni2+ doping.
- Published
- 2019