Recent Advances in Manganese Oxide Nanocrystals: Fabrication, Characterization, and Microstructure

Abstract

Nanocrystals 3835 3.1. Progress in Mn 2 O 3 Nanomaterials 3835 3.2. Synthesis of Mn 2 O 3 Nanocrystals 3836 3.2.1. Method 3836 3.2.2. Instrumental Analysis 3836 3.3. Grain Growth Kinetics of Mn 2 O 3 Nanocrystals 3836 3.3.1. Kinetic Analysis 3836 3.3.2. Microstructure Analysis 3838 3.4. Spectral Properties of Mn 2 O 3 Nanocrystals 3839 3.4.1. Raman Features of Different Grain Sizes 3839 3.4.2. IR Features of Different Grain Sizes 3840 3.4.3. XPS Analysis of Different Grain Sizes 3841 3.4.4. ESR Analysis of Different Grain Sizes 3843 4. Controllable Synthesis and Microstructure Evolution of Mn 3 O 4 Nanocrystals 3844 4.1. Progress in Mn 3 O 4 Nanomaterials 3844 4.2. Shape-Controlled Synthesis of Mn 3 O 4 Nanocrystals 3845 4.2.1. Synthesis Techniques 3845 4.2.2. Instrumental Analysis 3845 4.3. Microstructure Evolution of Single-Crystal Mn 3 O 4 Nanocrystals 3845 4.3.1. Mn 3 O 4 Nanoparticles 3845 4.3.2. Mn 3 O 4 Nanorods 3846 4.3.3. Mn 3 O 4 Nanofractals 3846 4.3.4. HRTEM Investigation of Mn 3 O 4 Nanocrystals 3847 4.3.5. Spectral Characteristics of Mn 3 O 4 Nanocrystals 3847 4.3.6. Formation Mechanism of Mn 3 O 4 Nanocrystals 3849 5. Summary and Outlook 3849 5.1. Summary 3849 5.2. Outlook 3850 5.3. Concluding Remarks 3850 Author Information 3850 Corresponding Author 3850 Notes 3850 Biographies 3850 Acknowledgments 3852 List of Abbreviations 3852 References 3852

Facile Synthesis of Graphene-supported MnO, Mn3O4, and MnO2Nanocomposites by Controlling Gas Environment

“…MnO x nanocomposites have attracted increasing attention in photocatalysis, energy storage, and Li ion batteries because of their low cost, environmental abundance, and high theoretical specific capacitances. 4,5 Recently, several research groups have reported that graphene-supported MnO x nanocomposites can play a critical role in energy storage [5][6][7] and can be prepared by using an aqueous chemical method, 8 chemical reduction, [9][10][11] and colloidal mixing. 12 However, these methods are somewhat complicated and require different synthetic protocols to prepare specific MnO x nanoparticles (NPs) on graphene, which makes it difficult to produce those nanocomposites.…”

“…4 For the synthesis of MnO/G and Mn 3 O 4 /G, GO (0.2 g) was mixed with Mn(CH 3 COO) 2 ·4H 2 O (0.89 g) in 200 mL of distilled water. Hydrazine monohydrate (5 mL, 80%) was added to the mixture and stirred for 24 h to promote the intercalation of Mn 2+ on the GO.…”

Mn2O3 Nanoparticles Synthesized from Thermal Decomposition of Manganese(II) Schiff Base Complexes

“…Among the transition metals, manganese exhibits several oxidation state and forms different oxides such as MnO [8,9], Mn 2 O 3 [10,11], Mn 3 O 4 [8][9][10][11], and MnO 2 [8]. Manganese oxides are an important class of transition metal oxide family due to unique chemical and physical properties [8][9][10][11].…”

“…Among the transition metals, manganese exhibits several oxidation state and forms different oxides such as MnO [8,9], Mn 2 O 3 [10,11], Mn 3 O 4 [8][9][10][11], and MnO 2 [8]. Manganese oxides are an important class of transition metal oxide family due to unique chemical and physical properties [8][9][10][11]. Among the different oxidation state of manganese oxides, Mn 2 O 3 nanoparticles are well-known as non-toxic, cheap, environmentally friendly and abundant and widely investigated as anode materials for lithium ion batteries because of their large theoretical specific capacities [12][13][14], catalyst [15,16] and hydrazine electrochemical sensing [17].…”

Formation mechanism, optical and magneto-dielectric studies of new cubic spinel MgMnO3

“…1 Among them, manganese-based oxides in the form of ultra-fine particles and thin-film hetero-structures have found a number of applications where the surface and interface properties are significant. 2,3 Their catalytic behavior, magnetic properties, and ability to form large linked complexes with cyanide and ammonium ions make them important class of compounds.…”