Hierarchical flower-like NiFe2O4 with core–shell structure for excellent toluene detection

Abstract

The extensive use of toluene stimulates the effective detection by sensitive gas sensors based on unique materials. Here, hierarchical flower-like NiFe 2 O 4 with core-shell architecture was synthesized by a facile hydrothermal method in the presence of urea and NH 4 F. The controllable experiments indicated that the burr spheres and football-like samples were produced with individual urea or NH 4 F. The flower-like NiFe 2 O 4 sensor exhibited outstanding sensitivity of 19.95 to 100 9 10 -6 toluene with low detection limit (1 9 10 -6 ). Furthermore, the sensor showed superior sensing selectivity and longterm stability to toluene. The excellent sensing properties could largely arise from a combination of high surface area, numerous active sites, porous structures, and the native catalytic characteristics of NiFe 2 O 4 to facilitate toluene molecules adsorption, diffusion, and reaction.

An Ion‐Engineering Strategy to Design Hollow FeCo/CoFe2O4 Microspheres for High‐Performance Microwave Absorption

“…At this stage, F − acted as a growth-rate regulator to decrease the release speed of free metal ions from complexes and contributed to the nucleation of FMs. [27] The NH 4…”

A novel electrochemical detection method for butylated hydroxyanisole (BHA) as an antioxidant: a BHA imprinted polymer based on a nickel ferrite@graphene nanocomposite and its application

“…During the growth process, the crystal nuclei provided a sphere to decrease the surface energy. 42 Finally, the hydroxides became oxides via the elimination of H 2 O molecules. 34…”

Ru-functionalized Ni-doped dual phases of α/γ-Fe2O3 nanosheets for an optimized acetone detection

“…Extensive details for the gas sensor fabrication and testing were provided in our previous work [26,27]. To fabricate the gas sensor, a slurry was formed by mixing prepared samples and water, which was further coated onto an alumina tube (4 mm in length, 1.2 mm in external diameter and 0.8 mm in internal diameter) with two Au electrodes connected by Pt wires on both ends of the tube.…”