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Porous Javelin‐Like NiFe 2 O 4 Nanorods as n‐Propanol Sensor with Ultrahigh‐Performance
Author(s) -
Wang XiaoFeng,
Sun KaiMing,
Li ShaoJie,
Song XueZhi,
Cheng Li,
Ma Wei
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802879
Subject(s) - nanorod , materials science , annealing (glass) , tortuosity , chemical engineering , propanol , porosity , bimetallic strip , selectivity , metal , nanotechnology , composite material , metallurgy , catalysis , chemistry , organic chemistry , methanol , engineering
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 NiFe 2 O 4 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 °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 NiFe 2 O 4 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.