Synthesis of Mn substituted CuFe2O4 nanoparticles for liquefied petroleum gas sensor applications

Kumar, Е. Ranjith; Jayaprakash, R.; Devi, G. Sarala; Reddy, P. Siva Prasada

doi:10.1016/j.snb.2013.09.108

Cited by 90 publications

(9 citation statements)

References 33 publications

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“…Spinels such as Mn 3 O 4 , CuFe 2 O 4 , NiCr 2 O 4 , CuCr 2 O 4 and ZnMn 2 O 4 exhibit distortion in the crystal structure as a consequence of JT effect [1,[6][7][8][9]. Tuning such structural distortion by site specific substitution with either magnetic or nonmagnetic elements in the spinel lattice is a well-known strategy to probe the cooperative phenomena like orbital, charge, spin, and lattice degrees of freedom in strongly correlated electron systems [7,[10][11][12][13]]. Among the above mentioned systems, CuFe 2 O 4 (CFO) widely known as cuprospinel or copper ferrite is a well-studied compound due to its unique change in the crystal structure from the high-temperature cubic phase (8.392 Å [14]) to the low-temperature tetragonal phase (a ∼ 8.243 Å and c ∼ 8.699 Å [15]) along with its ferrimagnetic Néel temperature (T FN ) variation (between 710 and 780 K) and semiconducting behaviour [16,17].…”

Section: Introductionmentioning

confidence: 99%

Dynamical response of localized electron hopping and dipole relaxation in Cu_1 − xZn_xFe₂O₄ magnetoceramics

Jena¹,

Joshi²,

Ghosh³

et al. 2021

J. Phys. D: Appl. Phys.

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We report a detailed study on the dynamical response of localized electron hopping and dipole relaxation in bulk polycrystals of Zn diluted Cuprospinel (Cu1 − x Zn x Fe2O4). The variations in the dielectric dispersion and ac-resistivity (ρ ac ) were analyzed over a wide temperature (77 K ≤T ≤ 823 K) and frequency (20 Hz ≤ f ≤ 20 MHz) window for a critical composition x c = 0.4. The variation of R (f, T) followed the Maxwell–Wagner type polarization mechanism in-line with the Koops phenomenological theory. Our analysis of ρ ac (T, f) provide strong evidence to the Mott’s variable range hopping of charge transport between the localized states at low temperatures, however, thermally-activated Arrhenius like behaviour was noticed at high temperatures with E A = 656 meV for x c = 0.4. Moreover, electric modulus spectroscopic studies (M *(f, T)) reveals two distinct types of relaxation phenomena: (i) the short-range oscillations of the charge carriers within the potential well of grains and (ii) the long-range movement of charge carriers across the grain boundaries. The depressed semi-circles of the Nyquist plots and lower values of non-exponential parameter extracted from M *(f, T) suggest the non-Debye type relaxation process present in the system with a widespread distribution of relaxation times. The frequency exponent (s(x, T)) study of Jonscher’s power law reveals that the ac-conductivity follows small-polaron tunnelling followed by the correlated-barrier-hopping mechanism for 0.1. However, for x ≥ x c reorientational hopping mechanism is predominant, except for 400 K, where thermally activated Arrhenius-type conduction of charge carriers is prevalent in this spinel system. Furthermore, the tetragonally (I41/amd) distorted systems (x ≤ 0.05) exhibit less activation energy (E A − VRH ) values as compared to those of cubic-spinel symmetry (Fd-3m) which saturates at 130 meV for 0.1 ≤ x ≤ 0.6. Compositional dependent tunability of the above discussed parameters may open a constructive approach to design low energy-loss and high-resistive electromagnetic elements for microwave devices which is the key significance of the present study.

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Section: Introductionmentioning

confidence: 99%

Dynamical response of localized electron hopping and dipole relaxation in Cu_1 − xZn_xFe₂O₄ magnetoceramics

Jena¹,

Joshi²,

Ghosh³

et al. 2021

J. Phys. D: Appl. Phys.

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“…Their magnetic properties have always attracted the attention of scientists all over the world. Catalysis [131], information technology [132], biosensor [133,134], and medicine [135], have produced a wide range of applications. SFNPs are used in a variety of biomedical applications, the most popular of which are disease detection, cancer treatment, and drug delivery.…”

Section: Biomedical Applications Of Sfnpsmentioning

confidence: 99%

Recent Advances in Processing, Characterizations and Biomedical Applications of Spinel Ferrite Nanoparticles

Kumar

Katoch

2021

Materials Research Foundations

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Many researchers are interested in investigating ceramic materials because of the potential for their use in nanotechnology. Spinel ferrites are a diverse group of materials with many applications. Electronic devices such as inductors, power, information storage, microwave, and induction tuners are only a few examples. As ferrite materials exhibit super-paramagnetic activity, their potential for biological applications such as drug delivery, hyperthermia, and resonance magnetic imaging. As a result, super-paramagnetism is a highly desirable property in spinel ferrites. Due to the size dependence, the methodologies used to synthesis of these materials have emerged as a critical step in achieving the desired properties. Many synthesis strategies have been developed in this regard such as sol-gel, co-precipitation, solid-state, solution combustion method and so on. As a result, this study provides a historical overview of spinel ferrites, as well as key principles for comprehending their various characterization techniques and properties. Recent developments in the synthesis and applications of spinel ferrites are also discussed.

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“…Inside the spinel structure, there are numerous voids in the tetrahedron and octahedron formed by close packing of oxygen. When the voids are doped by other elements or the original elements are replaced, it will have a great impact on the gas sensitivity of the material [ 92 , 93 , 94 ]. At present, people mainly study the doping or modification between non-noble metals and the spinel structure.…”

Section: Enhancingmentioning

confidence: 99%

Spinel-Type Materials Used for Gas Sensing: A Review

Yuan

Meng

2020

Sensors

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Demands for the detection of harmful gas in daily life have arisen for a period and a gas nano-sensor acting as a kind of instrument that can directly detect gas has been of wide concern. The spinel-type nanomaterial is suitable for the research of gas sensors because of its unique structure. However, the existing instability, higher detection limit, and operating temperature of the spinel materials limit the extension of the spinel material sensor. This paper reviews the research progress of spinel materials in gas sensor technology in recent years and lists the common morphological structures and material sensitization methods in combination with previous works.

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Synthesis of Mn substituted CuFe2O4 nanoparticles for liquefied petroleum gas sensor applications

Cited by 90 publications

References 33 publications

Dynamical response of localized electron hopping and dipole relaxation in Cu_1 − xZn_xFe₂O₄ magnetoceramics

Dynamical response of localized electron hopping and dipole relaxation in Cu_1 − xZn_xFe₂O₄ magnetoceramics

Recent Advances in Processing, Characterizations and Biomedical Applications of Spinel Ferrite Nanoparticles

Spinel-Type Materials Used for Gas Sensing: A Review

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Synthesis of Mn substituted CuFe2O4 nanoparticles for liquefied petroleum gas sensor applications

Cited by 90 publications

References 33 publications

Dynamical response of localized electron hopping and dipole relaxation in Cu1 − x Zn x Fe2O4 magnetoceramics

Dynamical response of localized electron hopping and dipole relaxation in Cu1 − x Zn x Fe2O4 magnetoceramics

Recent Advances in Processing, Characterizations and Biomedical Applications of Spinel Ferrite Nanoparticles

Spinel-Type Materials Used for Gas Sensing: A Review

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Dynamical response of localized electron hopping and dipole relaxation in Cu_1 − xZn_xFe₂O₄ magnetoceramics

Dynamical response of localized electron hopping and dipole relaxation in Cu_1 − xZn_xFe₂O₄ magnetoceramics