Basics of Adsorption

Wandelt, K.

doi:10.1002/9783527680573.ch31

Cited by 2 publications

(2 citation statements)

References 85 publications

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“…These surfaces have the higher importance in the nanocrystal morphology. Assuming the surface free energy is only due to the energy required to break first neighbor bonds, , we can determine the surface energy from the simple following model.…”

Section: Discussionmentioning

confidence: 99%

Original Anisotropic Growth Mode of Copper Nanorods by Vapor Phase Deposition

Prunier

Ricolleau

Nelayah

et al. 2014

Crystal Growth & Design

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We report on a thermal evaporation method to synthesize copper nanorods, up to several microns long. The synthesis parameters that control the size and aspect ratio are studied to understand their influence on this anisotropic growth mode. We exploit the multifunctionalities of electron microscopy for studying the structural properties of these nanorods, in particular their growth morphology. By analyzing the face-centered cubic structure of the nanorods along several orientations, we demonstrate that their anisotropic axis is parallel to the [110] direction. The precise 3D shape of the nanorods is determined by using electron tomography, evidencing a morphology with a 2-fold symmetry and rectangular facets. This unusual faceting for metal nanorods is actually consistent with energetic considerations and arises from a growth mode that is different from the one of chemically prepared nanorods.

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Section: Discussionmentioning

confidence: 99%

Original Anisotropic Growth Mode of Copper Nanorods by Vapor Phase Deposition

Prunier

Ricolleau

Nelayah

et al. 2014

Crystal Growth & Design

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“…However, {111} facets are referred to as the most densely packed with the lowest chemical potential among other planes, provided that these additives present in a large amount in the synthesis, the less polar and least densely packed {100} facets of the particles too become capped by the additives . In fact, {100} facets constitute four dangling bonds per atom as compared to the three dangling bonds per atom of {111} facets; , therefore, the chemical additives strongly bind onto the {100} facets and act as a steric barrier for the deposition of monomers onto the {100} facets. This, in turn, results in the monomers (of higher chemical potential) from the solvent medium to deposit onto the lowest chemical potential {111} facets.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Insights into the Formation and Growth of Anisotropic-Shaped Wüstite–Spinel Core–Shell Iron Oxide Nanoparticles in a Coordinating Solvent

Narnaware

Ravikumar

2020

J. Phys. Chem. C

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Wustite (FeO)−spinel (magnetite, Fe 3 O 4 /maghemite, γ-Fe 2 O 3 ) core−shell iron oxide nanoparticles (IONPs) of shapes cuboctahedron, cube, and octopods were successfully synthesized by thermal decomposition of an iron oleate precursor conducted using a bulky coordinating solvent, tri-n-octylamine in the presence of oleic acid. The shape of particles was kinetically controlled by varying the aging time of particles at the reaction temperatures 320, 350, and 365 °C. With increasing reaction temperatures, we find that the particle shape evolves from a cuboctahedron to a cube to an octopod. To explain the shape transition, we propose the formation mechanisms of differently shaped particles at these reaction temperatures by accounting the relative rate of iron oxide monomer deposition onto the {111} facets over surface diffusion of the deposited monomers majorly toward {100} facets of the growing crystals. We elucidate that at increasing temperatures, the monomer deposition rate increases over the surface diffusion rate, which leads to the shape transition. Further, we propose the growth mechanisms of differently shaped particles at these temperatures based on the estimated timescales of growth events such as diffusion-controlled growth, Ostwald ripening growth, and Brownian coagulation growth in comparison to the experimental aging time. We find that at 320 °C, the coagulation growth time scale is large as compared to the experimental aging time; hence, particles at 320 °C grow via diffusion-controlled growth and Ostwald ripening growth events. In contrast, at 350 and 365 °C, the coagulation growth timescales are smaller than the experimental aging time, and the particles grow via all of the growth events. The present work provides insights into the understanding of largesized differently shaped IONPs formed in the thermal decomposition route either by the coordination of the reaction solvent or chemical additives (capping agents) to the specific facet of growing crystals.

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Basics of Adsorption

Cited by 2 publications

References 85 publications

Original Anisotropic Growth Mode of Copper Nanorods by Vapor Phase Deposition

Original Anisotropic Growth Mode of Copper Nanorods by Vapor Phase Deposition

Mechanistic Insights into the Formation and Growth of Anisotropic-Shaped Wüstite–Spinel Core–Shell Iron Oxide Nanoparticles in a Coordinating Solvent

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