Journal
CHEMISTRYSELECT
Volume 3, Issue 45, Pages 12871-12877Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201802879
Keywords
gas sensing; nanorod; NiFe2O4; n-propanol; semiconductor
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Funding
- National Natural Science Foundation of China [51602035, 21601027]
- Liaoning Provincial Natural Science Foundation of China [20180510036]
- Open Funds of the State Key Laboratory of Rare Earth Resource Utilization [RERU2018020]
- Fundamental Research Funds for the Central Universities [DUT16RC(4) 69, DUT17RC(4) 25, DUT17LK33, DUT17LK54]
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The online detection of n-propanol concentration is required for health and safety issues in industry. Herein, through a morphology-inherited annealing treatment of Ni/Fe bimetallic metal-organic framework as the template, this paper reported the synthesis of porous javelin-like NiFe2O4 nanorods. As gas sensing material, the ferrite showed n-type gas-sensing behavior as its resistance decreased in reducing gas atmospheres, and exhibited excellent n-propanol sensing performance (the sensing response is 6.4 to 5 ppm) with ultralow detection limits (0.41 ppm) and ultrahigh gas sensitivity (1.13 ppm(-1)) toward n-propanol at relatively low working temperature (120 degrees C). Meanwhile, the sensor showed good selectivity to n-propanol as well as excellent cyclic and long-term stability. The unique morphology and porous structure of NiFe2O4 nanorods may be responsible for the excellent performance, which offer more reactive sites and accelerate the diffusion of n-propanol gas. This facile method of preparing porous metal oxides could be extended to fabricate other gas sensing materials applied to detect other target gases.
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