Highly Sensitive and Selective Toluene Sensor of Bimetallic Ni/Fe-MOFs Derived Porous NiFe₂O₄ Nanorods

Abstract

Here, we synthesized bimetallic Ni/Fe MOFs using 2-aminoterephthalic acid (NH2–BDC) as ligand by a facile hydrothermal route. After calcination, spindle-like Ni/Fe MOFs are transferred into porous NiFe2O4 nanorods. The resulting NiFe2O4 based sensor shows an excellent sensitivity (almost 60–500 ppm), good selectivity against various VOCs, and a good linearity in wide concentration and stability for toluene detection. Three major aspects of good catalytic activity, large surface area, and porous structures of NiFe2O4 are significantly attributed to the excellent gas-sensing performances. These findings demonstrate a new perspective of bimetallic Ni/Fe MOFs-derived NiFe2O4 for the promising application in toluene gas sensor.

The Effect of Heat Treatment on the Microstructure and Mechanical Properties of 2D Nanostructured Au/NiFe System

“…Permalloy has applications in areas, such as low frequency magnetic shielding and transformer cores, due to the successful combination of functional properties (high permeability, low coercivity, and small magnetic anisotropy) [ 4 , 5 , 6 , 7 , 8 ]. In addition, permalloy films are widely used as functional magnetic materials in magnetic field sensors (since they demonstrate the effects of giant and amorphous magnetoresistance) [ 9 , 10 , 11 ], magnetic recording devices [ 12 , 13 ], as spintronic material and as electromagnetic shields to protect functional electronics from permanent magnetic fields and electromagnetic radiations [ 14 , 15 ]. Ni-Fe alloys also show good corrosion resistance [ 16 ], good adhesion to various types of the substrates [ 7 , 14 , 15 ], and excellent mechanical characteristics (hardness in macro- and nanoscale, elastic modulus, wear and crack resistance, as well as resistance to plastic deformation) [ 17 , 18 ].…”

MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

“…Zhang et al prepared 1D α-Fe 2 O 3 /NiFe 2 O 4 heterojunction, which showed an improved response to acetone vapors using NiFe-bimetallic MOFs [39]. Previously, we prepared 1D porous NiFe 2 O 4 nanorods using 2-aminoterephthalic acid as the ligand, which showed excellent selectivity and sensitivity to toluene [40]. Nevertheless, as of now, tuning the NiFe 2 O 4 microstructures on a NiFe-bimetallic MOFs template base is still developing and in the early stage.…”

Size-controlled synthesis of spinel nickel ferrite nanorods by thermal decomposition of a bimetallic Fe/Ni-MOF

“…[24] The stoichiometry and morphology of pristine MOF crystals can be transformed via calcination to corresponding metal oxide nanomaterials [25,26] which exhibit uniform shape, hierarchical porosity [27], and high surface areas. [28][29][30][31] MOF-derived complex metal oxides and their nanocomposites show excellent potential for electromagnetic wave absorption, [32] volatile organic compound sensing, [33,34] in catalysis [35,36] and energy storage applications. [25,37] For instance, MOF-derived NiFe2O4 nanorods, [33] AFe2O4 (A= Ni, Co, Zn) nanocubes, [38] NiFe2O4 polyhedra [34] and NiFe2O4…”

“…[28][29][30][31] MOF-derived complex metal oxides and their nanocomposites show excellent potential for electromagnetic wave absorption, [32] volatile organic compound sensing, [33,34] in catalysis [35,36] and energy storage applications. [25,37] For instance, MOF-derived NiFe2O4 nanorods, [33] AFe2O4 (A= Ni, Co, Zn) nanocubes, [38] NiFe2O4 polyhedra [34] and NiFe2O4…”