Chemisorption and Physisorption of Water Vapors on the Surface of Lithium-Substituted Cobalt Ferrite Nanoparticles

Abstract

Ferrimagnetic materials have the assembly of n-type porous semiconductors that shows the evidence of several physical properties used in electronic devices and technology. If the water vapors are brought closer to the surface of n-type semiconductors, then the electrons near the surface of materials are transferred from the conduction band to the electron-accepting level of the water molecule that provides chemisorbed layer of OH– ions. The conduction of electrons takes place only when H3O+ releases one proton to the nearest water molecule that accepts electrons while releasing another proton and so on. This mechanism is known as the Grotthuss chain reaction; it is the essential conduction mechanism of water and surface layers of water on the humidity-sensitive semiconducting materials. In this article, the humidity-sensing properties of Li-substituted cobalt ferrite nanoparticles prepared by the solution combustion method are reported. The result of the data suggested that the substitution of Li ions improved the formation of smaller grains of cobalt ferrite, which results in a rise within the surface area and improved the humidity sensitivity of ferrite nanoparticles.

Tuning the Interfacial Properties of Spinels to Improve the Antimony Adsorption Ability

“…Another study also found that the size of the cobalt ferrite was tuned to the smallest particle diameter of 10 nm via changing the stoichiometry to acquire the optimal magnetic properties . In addition, previous studies also revealed that a particle diameter of ferrite (MFe 2 O 4 ) could be controlled by varying the surfactant ratio and doping ions, and a smaller particle size controls a variety of properties that are relevant to many potential applications. − …”

Structural, Magnetic, and Optical Studies of Ni–Mg Ferrites Synthesized by Polyol Method

“…To calculate the actual density the radius, mass and thickness of the pellet were measured ( D a = (mass/volume). [ 24,25 ] The calculated dislocation density, the expected distance between magnetic ions ( L A and L B ), the X‐ray density D x , the actual density D a , and the porosity are shown in Table 2 . The dislocation density, L A and L B , varies with increasing concentration of magnesium as the lattice parameter.…”