Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 299, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.126888
Keywords
Gas sensor; MoO3 nano-pompons; Ni-doping; Xylene
Funding
- National Key Research and Development Program of China [2016YFC0201002]
- Key project of the National Natural Science Foundation of China [61833016]
- National Nature Science Foundation of China [61831011, 61327804, 61520106003, 61803171, 61833006]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- Program for JLU Science and Technology Innovative Research Team [JLUSTIRT 2017TD-07]
- Fundamental Research Funds for the Central Universities
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MoO3 gas-sensing materials with different Ni2+ doping concentration were prepared by a simple one-step sol-vothermal 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 degrees C. These breakthroughs are attributed to the increase of surface-active sites and the improvement of micro-morphology caused by Ni2+ doping.
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