Size‐Dependent Optical Properties of MgO Nanocubes

Stankic, Slavica; Müller, Markus; Diwald, Oliver; Sterrer, Martin; Knözinger, Erich; Bernardi, Johannes

doi:10.1002/anie.200500663

Cited by 223 publications

(260 citation statements)

References 24 publications

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“…These red-shifted absorption features have been attributed to electronic transitions between states localized near low-coordinated surface features, such as terraces, edges, and corners. The fact that the relative intensity of the red-shifted absorption features increases as nanocrystal size is reduced provides convincing experimental evidence for this interpretation [9]. It is further backed up by first principles theoretical calculations of the electronic structure and optical properties of low-coordinated MgO features.…”

Section: Modification Of Optical Properties Of Mgo Nanocrystals By Domentioning

confidence: 71%

“…Consequently, engineering protocols that aim at the reproducible adjustment of color and emission intensity can be developed. In previous work, we have shown how nanocrystalline MgO exhibits particle-size-dependent absorption and luminescence properties [9] which are connected to low-coordinated sites at the surface such as corners and edges [10][11][12]. We have also shown how doping with the higher group two metals Ca, Sr, and Ba leads to a red-shift in excitation and luminescence energies [13][14][15][16].…”

Section: Introductionmentioning

confidence: 86%

“…3 Transmission electron microscopy images of MgO powders doped with 2 (a), 4 (b), and 6 % (c) of Ba. The related particle size distributions are plotted in (d) previously been attributed to transitions between electronic states localized near corner features [9][10][11][12]. On introduction of Ba, the absorption onset is reduced by about 0.5 eV and the low-energy peak near 4.7 eV is no longer clearly discernable.…”

Section: Optical Excitation Propertiesmentioning

confidence: 96%

“…They are cheap, widely available, non-toxic, and highly stable. The luminescence in these materials has a surface origin, therefore as particle size is reduced quantum yield is improved, while multiple scattering is minimized [9][10][11][12]. AEO can be prepared as highly dispersed solids via gas-phase synthesis and, thus, in the absence of solvents or surface groups that may affect the surface electronic structure in a less controllable way.…”

Section: Introductionmentioning

confidence: 99%

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Surface-specific visible light luminescence from composite metal oxide nanocrystals

et al. 2015

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Low-coordinated surface elements on metal oxide nanoparticles represent the basis for a new concept of luminescent nanoparticles made of abundant, non-toxic, and thermally stable materials. This combined experimental and theoretical study describes the generation and stability of Ba-doped MgO nanoparticle surfaces and their optical absorption and luminescence dependence on Ba loading. It is demonstrated that the vapor phase growth process employed here represents a particularly robust synthesis approach for particle powders with reproducibly adjustable photoluminescence emission properties in the range between blue and yellow light. Moreover, this indepth characterization also provides an understanding of the electronic and optical characteristics of this nanoparticulate material with a so far unnoticed potential for solidstate light applications that are based on down conversion of UV light.

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Section: Modification Of Optical Properties Of Mgo Nanocrystals By Domentioning

confidence: 71%

Section: Introductionmentioning

confidence: 86%

Section: Optical Excitation Propertiesmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Surface-specific visible light luminescence from composite metal oxide nanocrystals

et al. 2015

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“…S1a, ESI †). 20 In addition to CVS MgO, we also employed commercial nanocrystalline MgO (529699 Aldrich) for reference experiments ( Fig. S1 and S2 †).…”

Section: Chemical Vapor Synthesis Of Mgomentioning

confidence: 99%

Thin water films and magnesium hydroxide fiber growth

Gheisi¹,

Sternig²,

Redhammer

et al. 2015

RSC Adv.

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Thin films of water covering highly dispersed metal oxides can give rise to the spontaneous and spatially controllable growth of hydroxide fibers in ambient air. Knowledge about the underlying formation mechanisms is key to the rational development of metal oxide nanomaterials and associated microstructures. We used SiCl 4 as a water free chlorine ion source for the surface functionalization of MgO nanocubes and explored their subsequent transformation into magnesium oxychloride Mg 3 (OH) 5 Cl$4H 2 O fibers upon contact with water vapor. Specifically we show how the temperature of the functionalization process and material dispersion control the reaction pathway that can lead to very different products like Mg(OH) 2 , MgCl 2 $6H 2 O, or Mg 3 (OH) 5 Cl$4H 2 O and delineate a reaction mechanism. Lessons to be learned from this unique route to form hydroxide fibers under ambient conditions can be applied to a variety of microstructural evolution processes that involve metastable solids and superficial water acting both as a reactant and as a reaction medium for the hydration of metal oxide particles.

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Unique Bonding in Nanoparticles and Powders

McKenna

2009

Nanoscale Materials in Chemistry

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Size‐Dependent Optical Properties of MgO Nanocubes

Cited by 223 publications

References 24 publications

Surface-specific visible light luminescence from composite metal oxide nanocrystals

Surface-specific visible light luminescence from composite metal oxide nanocrystals

Thin water films and magnesium hydroxide fiber growth

Unique Bonding in Nanoparticles and Powders

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