Effect of Bi3+ ions on the humidity sensitive properties of copper ferrite nanoparticles

Chavan, Pradeep; Naik, L. R.

doi:10.1016/j.snb.2018.05.135

Cited by 22 publications

(15 citation statements)

References 30 publications

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“…It is observed that DC resistivity decreases with increasing temperature reveals the semiconducting behavior of ferrite nanoparticles; it is also due to the rise in drift mobility of electrical charge carriers and mostly depends on density, porosity, grain size, chemical composition, and so on. 10 The decreasing trend of DC resistivity with increasing temperature was due to the hopping of conduction of electrons from Fe 2+ to Fe 3+ ions.…”

Section: Resultsmentioning

confidence: 96%

“…The increasing trend within the lattice constant value was observed due to the slighter Li + ions (0.74 Å) that agglomerated with Fe 3+ ions (0.645 Å) and Co 2+ ions (0.65 Å). 10 …”

Section: Resultsmentioning

confidence: 99%

“…As a result, the decrease in DC resistivity with increasing temperature was due to the changes in cation distribution and difference in ionic size of the cations present in the ferrite system. 10 …”

Section: Resultsmentioning

confidence: 99%

“…X-ray density was calculated from the values of the lattice parameter using the formula , where 8 represents the number of molecules in a unit cell of spinel lattice, M is the molecular weight of the ferrite sample, N is Avogadro’s number, and a is the lattice constant. The relative humidity is generated by using the two-pressure technique in the relative humidity generator on the idea of the subsequent equation 10 where P a = actual pressure of water vapor at room temperature and P s = saturation pressure of water vapor. The humidity sensitivity factor was estimated by using the following equation: …”

Section: Characterization Detailsmentioning

confidence: 99%

“… 9 Thus, the conduction mechanism of electrons takes place only when H 3 O + releases one proton to the adjacent water molecule that accepts the electrons while releasing another proton, and so on. Such mechanism is called as the Grotthuss chain reaction mechanism 10 ; Grotthuss chain reaction is the fundamental conduction mechanism of water and water surface layers on humidity-sensitive materials.…”

Section: Introductionmentioning

confidence: 99%

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

Chavan¹

2021

ACS Omega

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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.

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Section: Resultsmentioning

confidence: 96%

“…The increasing trend within the lattice constant value was observed due to the slighter Li + ions (0.74 Å) that agglomerated with Fe 3+ ions (0.645 Å) and Co 2+ ions (0.65 Å). 10 …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%