Near-Surface Strain in Icosahedra of Binary Metallic Alloys: Segregational versus Intrinsic Effects

Pohl, Darius; Wiesenhütter, U.; Mohn, E.; Schultz, L.; Rellinghaus, Bernd

doi:10.1021/nl404268f

Cited by 29 publications

(34 citation statements)

References 41 publications

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“…17 large lattice expansion of up to 10% close to the surfaces. 20 Ab-initio calculations show that the change in surface energies is a function of the oxygen chemical potential. 21 In-situ TEM experiments show a change of the particle surface as surrounded by either CO or O 2 environments.…”

mentioning

confidence: 99%

The impact of oxygen on the morphology of gas-phase prepared Au nanoparticles

Pohl

Surrey

Schultz

et al. 2012

Applied Physics Letters

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Two-dimensional nanodiamond monolayers deposited by combined ultracentrifugation and electrophoresis techniques Appl. Phys. Lett. 101, 253111 (2012) The role of confinement on stress-driven grain boundary motion in nanocrystalline aluminum thin films J. Appl. Phys. 112, 124313 (2012) Luminescence properties of Sm3+ doped YPO4: Effect of solvent, heat-treatment, Ca2+/W6+-co-doping and its hyperthermia application AIP Advances 2, 042184 (2012) Site-controlled Ag nanocrystals grown by molecular beam epitaxy-Towards plasmonic integration technology

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mentioning

confidence: 99%

The impact of oxygen on the morphology of gas-phase prepared Au nanoparticles

Pohl

Surrey

Schultz

et al. 2012

Applied Physics Letters

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“…We assigned atomic columns to hcp-Co [0001] and Co 3 C phases accordingly (Fig. 4b), which con rms again the co-existence of Co and Co 3 C. A t of two dimensional (2D) Gaussians to the intensity of distribution of the atomic columns was used to acquire the precise column coordinates, which improved the resolution to sub-angstrom 38,46 . The perpendicular layer spacings were determined locally from those tted coordinates and then averaged for each shell (d 12 , d 23 , d 34 ...) ( Supplementary Fig.…”

Section: Resultsmentioning

confidence: 94%

“…2D Gaussian tting of TEM image. The 2D Gaussian t to the intensity distribution of the atomic columns from HRTEM image was conducted using the StatSTEM V3.0 code run on MATLAB (R2015b) 46 . More details were showed in Supplementary Fig.…”

Section: Methodsmentioning

confidence: 99%

Carbon-Involved Near-Surface Evolution of Cobalt Catalyst during Reaction: An in-situ Study

Yang

Zhao

Wang

et al. 2020

Preprint

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Abstract When carbon-containing species are involved in reactions catalyzed by transition metals at high temperature, the diffusion of carbon on/in catalysts dramatically influence the catalytic performance. Acquiring information on the carbon-diffusion-involved evolution of catalysts at atomic level is crucial for understanding the reaction mechanism yet also challenging. For the chemical vapor deposition process of single-walled carbon nanotubes (SWCNTs), we developed methodologies to record in-situ the near-surface structural and chemical evolution of Co catalysts with carbon permeation using an aberration-corrected environmental transmission electron microscope and the synchrotron X-ray absorption spectroscopy. The nucleation and growth of SWCNTs were linked with the partial carbonization of catalysts and the alternating dissolvement-precipitation of carbon in catalysts. The dynamics of carbon atoms in catalysts brings deeper insight into the growth mechanism of SWCNTs and also sheds light on inferring mechanisms of more reactions. The methodologies developed here will find broad applications in studying catalytic and other processes.

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“…It is reported that multiply twinned icosahedrons usually contain intrinsic strain with compression stress in the core and tension stress in the shell [32,33], where the lattice tends to gradually expand from inner to outer layers [32,34]. As mentioned above, Cu 5 FeS 4 can crystallize into three phases: high cubic phase (Fm3m, a = 5.49 Å), intermediate cubic phase (Fm3m, a = 10.95 Å), and orthorhombic phase (Pbca, a = c = 10.95 Å, b = 21.862 Å) [20,29].…”

Section: The Formation Mechanisim Of Core-shell Structuresmentioning

confidence: 99%

“…It is of interest to note that intrinsic inhomogeneous strains are reported to exist in small particles (especially the multiply twinned particles) [36,37], which will induce chemical segregation [34,38], structural fluctuations and phase instability [39], and so on. On the other hand, the intrinsic strains of nano-particles can be utilized to improve the stability of core-shell structures and regulate crystal structures, which may be used to design core-shell and other exotic nanostructures.…”

Section: The Formation Mechanisim Of Core-shell Structuresmentioning

confidence: 99%

Structural Core-Shell beyond Chemical Homogeneity in Non-Stoichiometric Cu5FeS4 Nano-Icosahedrons: An in Situ Heating TEM Study

et al. 2019

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Thermal stability of core-shell structured nanoparticles is of vital importance to their practical applications at elevated temperature. Understanding the evolution of chemical distribution and the crystal structure of core-shell nanostructures with temperature variation at the nanoscale will open the route for practical applications and property enhancement of nanoparticles through proper design of new nanomaterials. In this study, core-shell non-stoichiometric Cu5FeS4 icosahedral nanoparticles were investigated by in situ heating transmission electron microscopy. Compared to the high structural and compositional stability at room temperature, the interdiffusion of Cu and Fe atoms became significant, ending up with disappearance of chemical difference in the core and shell over 300 °C. In contrast, different crystal structures of the core and shell were preserved even after heating at 350 °C, indicating the high structural stability. The inconsistency between chemical composition and crystal structure should be ascribed to the interaction between the intrinsic strain existing in the icosahedrons and various structures of this material system. In other words, the geometrically intrinsic strain of the nano-icosahedrons is helpful to modulate/maintain the core-shell structure. These findings open new opportunities for revealing the thermal stability of core-shell nanostructures for various applications and are helpful for the controllable design of new core-shell nanostructures.

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Near-Surface Strain in Icosahedra of Binary Metallic Alloys: Segregational versus Intrinsic Effects

Cited by 29 publications

References 41 publications

The impact of oxygen on the morphology of gas-phase prepared Au nanoparticles

The impact of oxygen on the morphology of gas-phase prepared Au nanoparticles

Carbon-Involved Near-Surface Evolution of Cobalt Catalyst during Reaction: An in-situ Study

Structural Core-Shell beyond Chemical Homogeneity in Non-Stoichiometric Cu5FeS4 Nano-Icosahedrons: An in Situ Heating TEM Study

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