Facile synthesis and characterization of Mn3O4 nanoparticles by auto-combustion method

Chen, Bin; Rao, Guanghui; Wang, Songwei; Lan, Yian; Pan, Liujun; Zhang, Xin

doi:10.1016/j.matlet.2015.04.087

Cited by 21 publications

(14 citation statements)

References 17 publications

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“…59,60 Overall, the coercivity was higher for samples obtained under dry O 2 and increased for the systems obtained at higher pressures. To the best of our knowledge, the measured coercivity values are the highest among those previously reported for Mn 3 O 4 films, 23,24 and similar (or slightly lower/ higher) values have been obtained only in nanoparticles 27,28,33,34,61,62 and nanowires/rods [24][25][26]32,36,37 where surface/interface and shape anisotropy, respectively, were indicated as the main factors responsible for the observed effects. In the present case, the high coercivity values could be traced back to the presence of microstructural defects (see the above-discussed XRD results) acting as pinning sites for domain wall motion.…”

Section: ■ Results and Discussionsupporting

confidence: 81%

High Magnetic Coercivity in Nanostructured Mn₃O₄ Thin Films Obtained by Chemical Vapor Deposition

Bigiani

Hassan

Peddis

et al. 2019

ACS Appl. Nano Mater.

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Nanostructured α-Mn3O4 (haussmannite) thin films consisting of evenly interconnected nanoaggregates were prepared on Si(100) substrates by chemical vapor deposition from a Mn(II) diketonate-diamine precursor under different reaction atmospheres (dry vs wet O2) and total operating pressures. The combination of chemico-physical results obtained by the joint use of complementary techniques enabled us to demonstrate the obtainment of high-purity Mn3O4 materials free from other manganese oxide phases, characterized by controllable structural and morphological characteristics as a function of the adopted processing conditions. Magnetic properties were investigated by analyzing temperature dependence (i.e., field-cooled and zero-field-cooled measurements) and field-dependence of the magnetization behavior. The obtained films show bulk-like magnetic properties, together with extraordinarily high low-temperature in-plane coercivities (up to ∼1 T). The possibility to tailor these values by varying the content of microstructural defects may foster the implementation of the obtained films in eventual technological applications.

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Section: ■ Results and Discussionsupporting

confidence: 81%

High Magnetic Coercivity in Nanostructured Mn₃O₄ Thin Films Obtained by Chemical Vapor Deposition

Bigiani

Hassan

Peddis

et al. 2019

ACS Appl. Nano Mater.

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“…Manganese oxides are invariably formed in divalent manganese samples sintered at high temperatures, even prepared under an inert atmosphere . In particular, Hausmannite (Mn 3 O 4 ) exhibits an almost identical bifurcation at 42 K as long as the particle size is large (>15 nm). − In our own research, we have observed that when care is not taken during synthesis, dark gray impurities are clearly visible on the surface of the light tan sample. Hausmannite is black, supporting this hypothesis.…”

Section: Discussionmentioning

confidence: 79%

Distinguishing the Intrinsic Antiferromagnetism in Polycrystalline LiCoPO₄and LiMnPO₄Olivines

Gnewuch

Rodriguez

2020

Inorg. Chem.

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We report a detailed investigation of the long-range magnetic ordering in polycrystalline samples of LiCoPO4 and LiMnPO4, which belong to a series of well-known olivine cathode materials LiMPO4 (M = Mn, Fe, Co, Ni). Samples were prepared by hydrothermal and solid state methods. The magnetic susceptibility is found to be strongly field-dependent, impacting the antiferromagnetic transition temperature and the bifurcation of the FC and ZFC curves. We discuss the role synthesis conditions have on impurity formation and particle size. We report neutron powder diffraction data for the samples prepared by solid state methods. Based upon representational analysis of the observed reflections, we affirm the magnetic structure Pnma′ for LiCoPO4 and Pn′m′a′ for LiMnPO4. The refined magnetic moments from these models are 3.28(4) μB for LiCoPO4 and 4.28(3) μB for LiMnPO4. We also study the onset of magnetic ordering in each sample and affirm that the ordering temperature is 22 K for LiCoPO4 and 34 K for LiMnPO4. The critical parameters describing those transitions are βc = 0.21(4) (LiCoPO4) and βc = 0.31(3) (LiMnPO4). These values are characteristic of a 3D Ising system for LiMnPO4 and intermediate behavior between a 2D and 3D Ising system for LiCoPO4. We compare these observations with other reports proposing lower magnetic symmetry.

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“…To increase the areal specific capacitance of the film supercapacitor and further demonstrate the advantages of interfacial assembly in preparing flexible graphene-based hybrid film supercapacitors, manganese oxide (MnO x , x = 2 or 4/3), an environmentally friendly and high pseudocapacitive electrochemical electrode material, [40] was chosen to hybridize with the PET-supported graphene film. It is well-known that the pseudocapacitive reaction of MnO x is a surface reaction, and only a very thin MnO x layer can actually contribute pseudocapacitance, and therefore great effort has been put into the preparation of sheet-like MnO x in order to fully utilize its high pseudocapacitance .…”

Section: Resultsmentioning

confidence: 99%

A Planar Graphene‐Based Film Supercapacitor Formed by Liquid–Air Interfacial Assembly

Chen

Xiang

et al. 2017

Adv Materials Inter

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Consequently, flexible supercapacitors, as advanced energy storage and conversion devices, are gradually attracting intense interest, and considerable effort has been devoted to the fabrication and engineering of highly flexible active electrode materials. [5,6] Graphene, a 2D carbon material discovered in 2004, [7] can be easily manipulated into macroscopic flexible films due to its ultralarge aspect ratio, [8] and graphene-based films have been reported to be promising electrode materials for flexible supercapacitors thanks to their high bendability, excellent electrical conductivity and easy modification. [9][10][11][12][13] The assembly of graphene-based films is crucial for fabricating graphene-based flexible film supercapacitors. Vacuum filtration and chemical vapor deposition (CVD) are common ways to prepare graphene-based films, with micrometer and nanometer thicknesses, respectively. The films are generally deposited on rigid substrates (such as a porous alumina filter, a silicon wafer, quartz, glass, and metal foils). [14,15] In order to use the as-produced graphene-based films as flexible active electrodes, a complicated transfer procedure from the original rigid substrate to a flexible substrate (such as polyethylene terephthalate (PET) and polyimide (PI)) is often required, which involves sacrifice or removal of the original substrate and hence is rather costly and time-consuming. [15] An interesting liquid-air interfacial phenomenon of graphene oxide (GO) films was reported a few years ago. [16] In the assembly, homogeneous GO aqueous solution is used as the parent solution, GO nanosheets concentrate at the interface constructed by the GO solution and air due to its amphiphilic nature, and kinetic energy provided by heat treatment promotes the concentration process of GO nanosheets, leading to formation of a GO film at the interface. This film could be easily retrieved by a flexible PET substrate, leading to a PET-supported GO film after drying in ambient conditions, and this PET-supported GO film is an ideal precursor for a flexible graphene film electrode. GO is chemically active and thermally unstable and can be reduced to graphene by chemical or heat treatment. In this work, such a PET-supported GO film was reduced into electrically conductive graphene film with highly integrity and flexibility by using hydriodic acid as the reducing reagent. A flexible supercapacitor could then be constructed on it. The size and A liquid-air interfacial assembly is used to produce a flexible substratesupported graphene film, which does not need the tedious substrate-transfer procedure that is generally required for many other film-making methods. The graphene film is used as the active working electrode in its planar configuration and an acidic polymer gel is used as the electrolyte, which leads to a flexible planar graphene film supercapacitor with a large areal specific capacitance of 773 µF cm −2 and superior retention performance. In order to demonstrate the versatile application of interfacial assembly in ...

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Facile synthesis and characterization of Mn3O4 nanoparticles by auto-combustion method

Cited by 21 publications

References 17 publications

High Magnetic Coercivity in Nanostructured Mn₃O₄ Thin Films Obtained by Chemical Vapor Deposition

High Magnetic Coercivity in Nanostructured Mn₃O₄ Thin Films Obtained by Chemical Vapor Deposition

Distinguishing the Intrinsic Antiferromagnetism in Polycrystalline LiCoPO₄and LiMnPO₄Olivines

A Planar Graphene‐Based Film Supercapacitor Formed by Liquid–Air Interfacial Assembly

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Facile synthesis and characterization of Mn3O4 nanoparticles by auto-combustion method

Cited by 21 publications

References 17 publications

High Magnetic Coercivity in Nanostructured Mn3O4 Thin Films Obtained by Chemical Vapor Deposition

High Magnetic Coercivity in Nanostructured Mn3O4 Thin Films Obtained by Chemical Vapor Deposition

Distinguishing the Intrinsic Antiferromagnetism in Polycrystalline LiCoPO4and LiMnPO4Olivines

A Planar Graphene‐Based Film Supercapacitor Formed by Liquid–Air Interfacial Assembly

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High Magnetic Coercivity in Nanostructured Mn₃O₄ Thin Films Obtained by Chemical Vapor Deposition

High Magnetic Coercivity in Nanostructured Mn₃O₄ Thin Films Obtained by Chemical Vapor Deposition

Distinguishing the Intrinsic Antiferromagnetism in Polycrystalline LiCoPO₄and LiMnPO₄Olivines