Small metal nanoparticle recognition using digital image analysis and high resolution electron microscopy

Flores, Aldrin Barreto; Altamirano, Leopoldo; Arias, M.O; Ascencio, J.A.

doi:10.1016/s0968-4328(03)00006-4

Cited by 19 publications

(10 citation statements)

References 3 publications

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“…The presence of twins can lead to fivefold twinned nanocluster that could correspond to the Mark's decahedron. Figure b shows clearly “Mark's type” facets that serve to increase the cluster stability . PdO formation due to oxygen addition leads to an increase of 2D defects as stacking faults or twin boundaries that could be related to as a form to release internal strains.…”

Section: Resultsmentioning

confidence: 99%

The role of oxygen on the growth of palladium clusters synthesized by gas aggregation source

Chamorro‐Coral

Caillard

Brault

et al. 2019

Plasma Processes & Polymers

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Palladium clusters are grown using a gas aggregation source coupled to magnetron sputtering with oxygen as reactive gas. Clusters with a mean size between 2.6 and 3.3 nm are obtained. Oxygen enhances the deposition rate by a factor 3 (from 4 to 11 mg/h cm −2 ) at the expense of the formation of larger clusters and the modification of the cluster composition. An increase of the oxygen flow rate induces a transition from Pd to PdO, this transition is followed by the formation of 2D structural defects in the crystals as displayed by grazing incidence X-ray diffraction and high resolution transmission electron microscopy micrographs. Oxygen interacts with both the target and the sputtered atoms, highlighting that the target oxidation could be considered as the key step that drives the cluster growth processes. K E Y W O R D S clusters, gas aggregation source, magnetron sputtering, nanofabrication Plasma Process Polym. 2019;16:e1900006 www.plasma-polymers.com

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Section: Resultsmentioning

confidence: 99%

The role of oxygen on the growth of palladium clusters synthesized by gas aggregation source

Chamorro‐Coral

Caillard

Brault

et al. 2019

Plasma Processes & Polymers

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“…The output of data provides the starting point of the multislice simulation if one wants to study multiple electron scattering effects or surface photon effects by comparing the absolute intensity Aveyard et al, 2014). This software can potentially be incorporated with automatic image recognition to enable easier searching for a particular nanoparticle structure (Logsdail et al, 2012;Flores et al, 2003) and help with sample tilting under STEM mode.…”

Section: Resultsmentioning

confidence: 99%

Kinematic HAADF-STEM image simulation of small nanoparticles

Yuan

2015

Micron

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The high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) has been widely used in nanoparticle characterization due to its relatively straightforward interpretability, although multislice simulation is often required in order to take into account the strong dynamical screening effect if quantitative structure information is needed. The multislice simulation is very time-consuming, which can be a hurdle in cases when one has to deal with a large set of images. In this paper, we introduce a simple computer program, based on kinematic-scattering method, which allows users to simulate HAADF-STEM images of small nanoparticles, in 'real time' on a standard desktop computer. By comparing with the sophisticated multislice simulation, we demonstrate that such an approach is adequate for nanoparticles of ∼3 nm in diameter (assuming an approximately spherical shape), particularly away from strict zone axis conditions. As an application, we show that the efficient kinematic simulation allows quick identification of orientation of nanoparticles.

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“…In this case, the instrument's information limit must resolve the main interplanar spacings of a material obtained along all the major, low-index zone axis orientations. The complex interrelationships between the HRTEM images and details of the NP orientation discussed in previous studies [27][28][29][30][31][32] were considered here.…”

Section: Methodsmentioning

confidence: 99%

Statistical analysis of support thickness and particle size effects in HRTEM imaging of metal nanoparticles

et al. 2016

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a b s t r a c tHigh-resolution transmission electron microscopy (HRTEM) examination of nanoparticles requires their placement on some manner of support -either TEM grid membranes or part of the material itself, as in many heterogeneous catalyst systems -but a systematic quantification of the practical imaging limits of this approach has been lacking. Here we address this issue through a statistical evaluation of how nanoparticle size and substrate thickness affects the ability to resolve structural features of interest in HRTEM images of metallic nanoparticles on common support membranes. The visibility of lattice fringes from crystalline Au nanoparticles on amorphous carbon and silicon supports of varying thickness was investigated with both conventional and aberration-corrected TEM. Over the 1-4 nm nanoparticle size range examined, the probability of successfully resolving lattice fringes differed significantly as a function both of nanoparticle size and support thickness. Statistical analysis was used to formulate guidelines for the selection of supports and to quantify the impact a given support would have on HRTEM imaging of crystalline structure. For nanoparticles Z1 nm, aberration-correction was found to provide limited benefit for the purpose of visualizing lattice fringes; electron dose is more predictive of lattice fringe visibility than aberration correction. These results confirm that the ability to visualize lattice fringes is ultimately dependent on the signal-to-noise ratio of the HRTEM images, rather than the point-to-point resolving power of the microscope. This study provides a benchmark for HRTEM imaging of crystalline supported metal nanoparticles and is extensible to a wide variety of supports and nanostructures.

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Small metal nanoparticle recognition using digital image analysis and high resolution electron microscopy

Cited by 19 publications

References 3 publications

The role of oxygen on the growth of palladium clusters synthesized by gas aggregation source

The role of oxygen on the growth of palladium clusters synthesized by gas aggregation source

Kinematic HAADF-STEM image simulation of small nanoparticles

Statistical analysis of support thickness and particle size effects in HRTEM imaging of metal nanoparticles

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