Oxide Nanoparticles

Seshadri, Ram

doi:10.1002/352760247x.ch5

Cited by 14 publications

(5 citation statements)

References 70 publications

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“…Nishihata et al initially demonstrated exsolution in three-way catalysts . Compared to particles prepared by deposition or impregnation, , the exsolved nanoparticles are partially embedded in the parent oxide . Their anchored structure makes the exsolved nanoparticles highly resistant toward coarsening , and helps maintain the particles in their original position of nucleation .…”

Section: Introductionmentioning

confidence: 99%

Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides

et al. 2021

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Exsolution generates stable and catalytically active metal nanoparticles via phase precipitation out of a host oxide. An ability to control the size and dispersion of the exsolution particles is desirable for design of nanostructured (electro)catalysts. Here, we demonstrate that tuning point defects by lattice strain affects both the thermodynamics and the kinetics of iron (Fe 0 ) exsolution on La 0.6 Sr 0.4 FeO 3 (LSF) thin film model. By combining in situ surface characterization and ab initio defect modeling, we show oxygen vacancy and Schottky defects to be the primary point defects formed upon Fe 0 exsolution. Lattice strain tunes the formation energy, and thus the abundance of these defects, and alters the amount and size of the resulting exsolution particles. In addition, we find that the density of exsolved nanoparticles matches the concentration of oxygen vacancy pairs, thus pointing to the surface oxygen vacancy pairs as preferential nucleation sites for exsolution. The tensile-strained LSF with a facile formation of these critical point defects results in a higher Fe 0 metal concentration, a larger density of nanoparticles, and a reduced particle size at its surfaces. These results provide important mechanistic insights and highlight the role of point-defect engineering in designing nanostructured catalysts in energy and fuel conversion technologies.

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Section: Introductionmentioning

confidence: 99%

Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides

et al. 2021

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“…Hyeon (49) has recently reviewed the synthesis of magnetic nanoparticles, including oxides. Rajamathi & Seshadri (215) have reviewed hydrothermal and solvothermal preparation of oxide nanoparticles, and the area itself, including synthesis, has been reviewed by one of us in a book chapter (216).…”

Section: Oxidesmentioning

confidence: 99%

Synthesis Routes for Large Volumes of Nanoparticles

Masala

Seshadri

2004

Annu. Rev. Mater. Res.

328

206

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This review focuses on the preparation of capped nanoparticles of inorganic materials, classified by composition. The materials described include elemental metals and metalloids (semiconductors), chalcogenide II-VI and IV-VI semiconductors, III-V semiconductors, and oxides (both of simple-and multitransition metal). Although particular emphasis is placed on methods that yield large volumes of nanoparticles, recent novel methods that may not necessarily be scalable are also reviewed. The review makes apparent the richness of chemistry that has become routine to practitioners in the field; diverse inorganic systems with distinct chemistry require distinct methods of preparation.

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“…The drawbacks include how their properties depend strongly on crystal structure, stoichiometry, the presence of native defects, and doping, which are extremely difficult to control. The advantage is that if we learn how to control the main factors influencing the properties, we will be able to tune them over broad ranges, ensuring that the materials are suitable for applications in solar cells, gas sensors, photocatalysis, optoelectronic devices, and energy storage [1][2][3][4][5][6][7][8][9][10][11]. Figure 2 shows the results of refining the above search.…”

Section: Introductionmentioning

confidence: 99%

ZnO-Based Materials: From Pauli’s Nonsense to a Key Enabling Technology

Ramos-Justicia,

Ferreiro,

Flores-Carrasco

et al. 2023

Photonics

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In this work, we aim to highlight the increasing interest in semiconductors, particularly ZnO. A revision of the evolution of the scientific production on three selected topics has been conducted. As an indicator of scientific production, the number of publications indexed in the Web of Science Data Base has been used. The search terms selected range from the general to the particular: semiconductors, oxide semiconductors, and ZnO. The period considered is from 1 January 1900 to 6 June 2023. The importance of doping processes in tailoring the properties of these materials, and the relevance of the most recently derived applications are also revised. Since many of the most recent applications that have been developed or are under development refer to optoelecronic properties, doping with rare earth elements has a central role. This was the reason behind choosing the system ZnO doped with Rare Earth elements (Eu, Gd, and Ce) and codoped with Ru to illustrate the materials’ tuning potential of doping processes. Morphology, crystal structure, and luminescent properties have been investigated. Upon doping, both the Near Band Edge and the Deep Level emissions show a remarkable difference due to the change in the relative weight of the components constituting these bands. The spectra in all cases extend over the whole visible range, with a main emission in the violet-blue region corresponding to the Near Band Edge, and a broad band extending from the blue-green to orange-red region associated with the presence of different defects.

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Oxide Nanoparticles

Cited by 14 publications

References 70 publications

Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides

Tuning Point Defects by Elastic Strain Modulates Nanoparticle Exsolution on Perovskite Oxides

Synthesis Routes for Large Volumes of Nanoparticles

ZnO-Based Materials: From Pauli’s Nonsense to a Key Enabling Technology

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