Benign making of sharp tips for STM and FIM: Pt, Ir, Au, Pd, and Rh

Nam, A. J.; Teren, Andrew R.; Lusby, T. A.; Melmed, A.J.

doi:10.1116/1.588186

Cited by 75 publications

(39 citation statements)

References 2 publications

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“…Our belief is based on the difference in ionization potential between hydrogen and krypton. Owing to the fact that the value of the ionization potential of krypton is lower than that of hydrogen [11] we can expect that the surface complexes formed in the course of palladium exposure to hydrogen do not undergo desorption during krypton-FIM imaging.…”

Section: Resultsmentioning

confidence: 99%

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Hydrogen-Induced Changes in Palladium Surface Structure: Field Ion Microscopy Study

Tomaszewska

Stępień

2008

Acta Phys. Pol. A

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In this work the field ion microscopy technique was used in order to examine hydrogen-induced changes in palladium surface structure in the context of surface palladium hydrides formation. The goal of the study is to determine the crystallographic planes on which the particles of interest are formed with greatest intensity. Employing a method which consists in finding the differences in the brightness of field ion microscopy images we found that the structures of palladium surface hydrides, the size of which varies from 1 to 30 nm, develop mainly on {110} planes of palladium.

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Section: Resultsmentioning

confidence: 99%

“…The field ion specimen was prepared from a 0.1 mm palladium wire of 99.99% purity by means of ac (≈ 5 V) electropolishing in 38% solution of HCl in glycerine [11]. Before experiment, the specimen surface was shaped to an atomically smooth end-form by using both annealing at 1000 K and field evaporation.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen-Induced Changes in Palladium Surface Structure: Field Ion Microscopy Study

Tomaszewska

Stępień

2008

Acta Phys. Pol. A

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“…Atom probe samples were prepared by electropolishing using a solution of 50% CaCl 2 by volume in water for the first step, starting at about 35 Vac with a graphite counter electrode [8]. Then, the samples were fabricated to have the curvature radius of less than 100 nm by focused ion beam (FIB, SMI3050, SIINT).…”

Section: Experimental a The Transformation Of Surface Compositiomentioning

confidence: 99%

The Analysis of Metal Catalyst Nanoparticle by Atom Probe Tomography

Morita

Karasawa

Asaka

et al. 2014

e-J. Surf. Sci. Nanotechnol.

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Nano alloys based on platinum form the basis for automobile exhaust catalyst, one of the most successful and important families of heterogeneous catalysts used in industry today. In this study, the structure of Pt-Pd catalyst is analyzed by atom probe tomography (APT). APT which has high spatial resolution and high detection sensitivity with single atomic level is widely used in the world in order to evaluate atomic structure of metals and semiconductor materials as typified by field effect transistor. The transformation of catalyst surface composition was observed by several thermal and environmental conditions in order to discuss the deterioration of catalyst. To observe the existence of catalytic reaction under APT condition, the field evaporated ions which originated from CxHy thin film on Pt-Pd or W needle were compared. In the result of this study, the transformation of composition at surface micro region occurs by thermal treatment of Pt-Pd alloy.

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“…The temperature of outgasing was high enough for a distinct evaporation of iridium. Emitters were prepared using Melmed's procedures [10]. The Jr emitter tip was cleaned by the resistive heating of the emitter loop assembly.…”

Section: Apparαtusmentioning

confidence: 99%

Surface Self-Diffusion of Iridium: Field Electron Emission Study

Antczak

Błaszczyszyn

2000

Acta Phys. Pol. A

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The self-diffusion of iridium was studied by means of field electron microscopy. The measurements, based on the well-known process of surface build-up, were carried out under the UHV conditions within the temperature range of 790-935 K. The activation energy for the diffusion was determined to be equal to 2.10f 0.10 eV/atom (48.4f 2.3 kcal/mol). This value is compared with activation energies for self-diffusion on other metal surfaces, as well as with those for self-diffusion of single iridium atoms and clusters on iridium, known from the field ion microscopy measurements.

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Benign making of sharp tips for STM and FIM: Pt, Ir, Au, Pd, and Rh

Cited by 75 publications

References 2 publications

Hydrogen-Induced Changes in Palladium Surface Structure: Field Ion Microscopy Study

Hydrogen-Induced Changes in Palladium Surface Structure: Field Ion Microscopy Study

The Analysis of Metal Catalyst Nanoparticle by Atom Probe Tomography

Surface Self-Diffusion of Iridium: Field Electron Emission Study

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