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

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.