The magnetism of DySc(2)N@C(80) endofullerene was studied with X-ray magnetic circular dichroism (XMCD) and a magnetometer superconducting quantum interference device (SQUID) down to temperatures 2 K in fields up 7 T. XMCD shows hysteresis the 4f spin orbital moment Dy(III) ions. SQUID magnetometry indicates below 6 K, while thermal nonthermal relaxation is observed. Dilution samples C(60) increases zero-field electron time at several hours.

The atomic and electronic structure of the lattice-mismatched $h\text{\ensuremath{-}}\mathrm{B}\mathrm{N}∕\mathrm{Pt}(111)$ $h\text{\ensuremath{-}}\mathrm{B}\mathrm{N}∕\mathrm{Rh}(111)$ interfaces formed by pyrolitic reactions with vaporized borazine has been studied low-energy electron diffraction, scanning tunneling microscopy, x-ray-absorption spectroscopy, core-level valence-band photoemission. It found that on Pt(111), $h\text{\ensuremath{-}}\mathrm{B}\mathrm{N}$ forms a nearly flat...

A single molecule magnet (SMM) can maintain its magnetization direction over a long period of time [1,2]. It consists in low number atoms that facilitates the understanding and control ground state, which is essential future applications such as high-density information storage or quantum computers [3,4]. Endohedral fullerenes realize robust, nanometer sized, chemically protected magnetic clusters are not found free species nature. Here we demonstrate how adding one, two, three dysprosium to...

Clusterfullerenes are capable of entrapping a variety metal clusters within carbon cage, for which the entrapped cluster generally keeps its geometric structure (e.g., bond distance and angle) upon changing isomeric fullerene whether properties is geometry-dependent remains unclear. Herein we report an unusual triangular monometallic in cage by isolating several novel terbium cyanide clusterfullerenes (TbNC@C82) with different structures. Upon varying C82 from C2(5) to Cs(6) C2v(9), TbNC...

The surface structure of Pd(100) during CO oxidation was measured using a combination flow reactor and in situ X-ray diffraction coupled to large-area 2-dimensional detector. for P(O(2))/P(CO) ratios between 0.6 10 at fixed total gas pressure 200 mbar ± 1 mbar. In conjunction with the reactivity also determined. For all found oxidize above certain temperature. Three different types oxides were observed: oxide, an epitaxial layer bulk-like PdO, non-epitaxial PdO. As soon as oxide present be...

Using a combination of surface X-ray diffraction and mass spectrometry at realistic pressures, the CO oxidation reactivity Rh(111) model catalyst has been studied in conjunction with structure. The measurements show that specific thin oxide is always present high activity regime Rh-based oxidation.

Using in situ high-pressure x-ray photoelectron spectroscopy, we have followed the oxidation and reduction of Pd model catalysts oxygen CO pressures millibar range. The study includes a Pd(100) single crystal as well SiO${}_{x}$-supported nanoparticles 15 or 35 nm diameter, respectively. We demonstrate that also form ultrathin surface oxides prior to onset bulk PdO. are observed oxidize at sample temperatures 40 degrees lower than single-crystal surface. In $3{d}_{5/2}$ O $1s$ spectrum,...

The use of methane as a reactive gas dramatically increases the selectivity arc-discharge synthesis M-Ti-carbide clusterfullerenes (M=Y, Nd, Gd, Dy, Er, Lu). Optimization process parameters allows Dy2TiC@C80-I and its facile isolation in single chromatographic step. A new type cluster with an endohedral acetylide unit, M2TiC2@C80, is discovered along second isomer M2TiC@C80. Dy2TiC@C80-(I,II) Dy2TiC2@C80-I are shown to be single-molecule magnets (SMM), but presence carbon atom Dy2TiC2@C80...

Abstract Fused‐pentagons results in an increase of local steric strain according to the isolated pentagon rule (IPR), and for all reported non‐IPR clusterfullerenes multiple (two or three) metals are required stabilize strained fused‐pentagons, making it difficult access single‐atom properties. Herein, we report syntheses isolations novel mononuclear MNC@C 76 (M=Tb, Y), which one pair fused‐pentagon is stabilized by a cluster. The molecular structures Y) were determined unambiguously...

The interaction between the endohedral unit in single-molecule magnet Dy_{2}ScN@C_{80} and a rhodium (111) substrate leads to alignment of Dy 4f orbitals. resulting orientation Dy_{2}ScN plane parallel surface is inferred from comparison angular anisotropy x-ray absorption spectra multiplet calculations corresponding ligand field. magnetic circular dichroism also angle dependent signals strong magnetocrystalline anisotropy. This directly relates geometric structure. Element specific...

Using a combination of surface x-ray diffraction and mass spectrometry at realistic pressures, the CO oxidation reactivity Rh(111) Rh(100) model catalysts has been studied in conjunction with structure. The measurements show that presence specific thin oxide is crucial for high activity Rh based oxidation. As this readily formed on all facets, we conclude crystal planes exposed during catalysis will not directly influence reactivity. This fortified by very close similarity between results.

Abstract The low‐temperature magnetic properties of the endohedral metallofullerene HoSc 2 N@C 80 have been studied by superconducting quantum interference device (SQUID) magnetometry. Alternating current (ac) susceptibility measurements reveal that this molecule exhibits slow relaxation magnetization in a small applied field with timescales order milliseconds. equilibrium indicate strong anisotropy. large differences times between present compound and previously investigated DySc are discussed.

Spark ablation is a versatile technique for producing pure size-selected nanoparticles. The carrier gas used in spark affects the nanoparticles' generation, crystalline structure, and chemical composition. comprehension of this phenomenon can contribute to design nanoparticles with tailored properties. In paper, we evaluate effects reducing (95%N2 + 5%H2), inert (N2), oxidative (air) gases setup Co–Ni alloyed electrodes. agglomerates' particle size distribution, morphology, composition were...

Using a combined experimental and theoretical approach, we show that the initial oxidation of Rh(553) surface, surface vicinal to (111), undergoes step bunching when exposed oxygen, forming lower-index facets. At pressure about ${10}^{\ensuremath{-}6}\phantom{\rule{0.3em}{0ex}}\mathrm{mbar}$ temperature $380\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ this leads (331) facets with one-dimensional oxide chains along steps, coexisting (111) Further increase results...

The oxidation of a vicinal Pd(553) surface has been studied from ultrahigh vacuum (UHV) to atmospheric oxygen pressures at elevated sample temperatures. investigation combines traditional electron based UHV techniques such as high resolution core level spectroscopy, low-energy diffraction, scanning tunneling microscopy with in situ x-ray and ab initio simulations. In this way, we show that the O atoms preferentially adsorb step edges below...

Using a combined experimental and theoretical approach, we show that thin RhO2 oxide film forms on Pt25Rh75(100) surface at elevated oxygen pressures temperatures prior to the bulk oxidation. By use of in situ x-ray diffraction under realistic CO oxidation reaction conditions, onset growth coincides with an increase CO2 production. During reaction, consumed is continuously re-grown by gas phase. Our results strongly suggest adsorbs metallic substrate but reacts O border between substrate....

ADVERTISEMENT RETURN TO ISSUEPREVCommentNEXTComment on "CO Oxidation Pt-Group Metals from Ultrahigh Vacuum to Near Atmospheric Pressures. 2. Palladium and Platinum"Richard van Rijn†‡, Olivier Balmes‡, Roberto Felici‡, Johan Gustafson§, Didier Wermeille‡, Rasmus Westerström§, Edvin Lundgren§, Joost W. M. Frenken*†View Author Information Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, ESRF, B.P. 220, F-38043 Grenoble, France, Department of...

The structure and chemical composition of Pd nanoparticles exposed to pure CO mixtures O(2) at elevated temperatures have been studied in situ by a combination X-ray Diffraction Photoelectron Spectroscopy pressures ranging from ultra high vacuum 10 mbar room temperature few hundred degrees celsius. Our investigation shows that under exposure, above certain temperature, carbon dissolves into the particles forming carbide phase. Upon exposure mixtures, phase forms disappears reversibly,...

Abstract Nanochains made up of a one-dimensional arrangement magnetic nanoparticles exhibit anisotropic properties with potential for various applications. Herein, using novel self-assembly method we directly integrate single nanochains onto desired substrates including devices. We present nanoscopic analysis magnetization reversal in 1D linear nanoparticle arrays by combining X-ray microscopy, magnetoresistance, and micromagnetic simulations. Imaging the local along individual scanning...

Magneto-responsive soft films constitute a fascinating class of smart materials and devices capable performing various tasks, such as micromanipulation or transport, noninvasive surgery, sensing. These components are fabricated by incorporating magnetic into flexible substrates. In this context, arranging particles elongated chains exhibiting shape anisotropy has shown great potential. Here, we introduce novel technique for fabricating magnetically responsive using continuous single-step...

We prepared a Au/CeO2 (111) model catalyst by depositing thin cerium oxide film on Ru(0001) surface and subsequently gold. This system was investigated using high-resolution photoemission spectroscopy. Gold forms metallic nanoparticles CeO2 with an average particle size that depends the Au dose. At 80 K adsorption of CO observed supported particles, which induces chemical shift +0.9 eV in 4f level atoms directly involved Au−CO bond. also additional, particle-size-dependent shift, affects all...

Using scanning tunneling microscopy and density functional theory, we have studied the initial oxidation of Rh(111) surfaces with two types straight steps, having ${100}$ ${111}$ microfacets. The one-dimensional (1D) oxide initially formed at steps acts as a barrier impeding formation 2D on (111) terrace behind it. We demonstrate that details structure 1D govern rate discuss implications for nanoparticles.

The adsorption of CO on nanosized gold particles deposited a cerium oxide substrate is strongly influenced by the roughness and concentration oxygen vacancies CeOx surface. Literature showed that Au nucleates at step edges oxidized samples. For samples we found dispersion dependent surface roughness. A rough CeO2 has higher density, which results in particle density with smaller average diameter. Other studies reduced substrates. We small adsorbed exhibit significantly 4f binding energy than...