Colloidal Synthesis of Noble Metal Nanoparticles of Complex Morphologies

Sau, Tapan K.; Rogach, Andrey L.

doi:10.1002/9783527652570.ch1

Cited by 26 publications

(29 citation statements)

References 636 publications

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“…In fact, nanocatalysts with multifaceted morphologies are highly desirable in catalysis. For fcc metal nanoparticles, the surface energy density ( γ ) for the three lowest index planes can be ordered as γ (111) < γ (100) < γ (110) [ 16 , 27 ]. Experimental studies have confirmed that this trend may also hold for ceria-based materials [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…For fcc metal nanoparticles, the surface energy density ( γ ) for the three lowest index planes can be ordered as γ (111) < γ (100) < γ (110) [ 16 , 27 ]. Experimental studies have confirmed that this trend may also hold for ceria-based materials [ 16 , 17 ]. Theoretical work on the interaction among CO and CeO 2 planes have shown the structure sensitivity for CO adsorption, thus suggesting weak CO adsorption for the most stable (111) surface and stronger chemisorption with (100) and (110) facets [ 18 – 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Study on the CO Oxidation over Ceria-Based Nanocatalysts

et al. 2016

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A series of ceria nanocatalysts have been prepared to study the structure dependency of the CO oxidation reaction. The ceria samples with well-defined nanostructures (nanocubes/Ce-NC and nanorods/Ce-NR) have been prepared using the hydrothermal method. Mesoporous ceria (Ce-MES) and ceria synthesized with solution combustion technique (Ce-SCS) have also been prepared for comparison. The lowest CO oxidation temperature has been reached by using ceria nanocubes (Ce-NC). This high activity draws immense contributions from the highly reactive (100) and (110) surfaces of the truncated nanocubes. The Ce-MES and Ce-SCS samples, despite their high surface areas, are unable to outdo the activity of Ce-NC and Ce-NR due to the abundant presence of (111) crystalline planes. This finding confirms the structure sensitivity of CO oxidation reaction catalyzed with ceria.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the CO Oxidation over Ceria-Based Nanocatalysts

et al. 2016

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“…In this context, Barnard et al [98] have presented detailed structure/ property maps, showing that faceted near-spherical shapes and spheres are the predominant morphologies in Ag NPs colloidal samples at low and high temperatures. The production of well-defined NPs with reproducible size and shape distributions remains challenging [99], although different studies report clarification of stability, probability, and population in NP ensembles [100]. The (100), (110), and (111) surfaces were modeled by unreconstructed (truncated bulk) slab models by using a calculated equilibrium geometry and using a (6×6×1) Monkhorst-Pack special k-points grid to ensure geometrical and energetic convergence for the Ag structures considered.…”

Section: Agmentioning

confidence: 99%

Effects of surface stability on the morphological transformation of metals and metal oxides as investigated by first-principles calculations

et al. 2015

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Morphology is a key property of materials. Owing to their precise structure and morphology, crystals and nanocrystals provide excellent model systems for joint experimental and theoretical investigations into surface-related properties. Faceted polyhedral crystals and nanocrystals expose well-defined crystallographic planes depending on the synthesis method, which allow for thoughtful investigations into structure-reactivity relationships under practical conditions. This feature article introduces recent work, based on the combined use of experimental findings and first-principles calculations, to provide deeper knowledge of the electronic, structural, and energetic properties controlling the morphology and the transformation mechanisms of different metals and metal oxides: Ag, anatase TiO 2 , BaZrO 3 , and α-Ag 2 WO 4 . According to the Wulff theorem, the equilibrium shapes of these systems are obtained from the values of their respective surface energies. These investigations are useful to gain further understanding of how to achieve morphological control of complex three-dimensional crystals by tuning the ratio of the surface energy values of the different facets. This strategy allows the prediction of possible morphologies for a crystal and/or nanocrystal by controlling the relative values of surface energies.

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“…To enhance the driving force for the oxidative corrosion, apart from heating at 100 8C, a large amount of KBr was added into the etching system, as the standard reductant potential of PdBr 4 2À /Pd pair is lower (0.49 V vs. SHE) than the chloride-based pair. [16] As a result, the Pd cubic cores could be completely removed through oxidative etching based on the following reaction:…”

Section: àmentioning

confidence: 99%