High resolution x-ray absorption spectroscopy with absolute energy calibration for the determination of absorption edge energies

Kraft, Stephan; Stümpel, J.; Becker, Peter; Kuetgens, U.

doi:10.1063/1.1146657

Cited by 237 publications

(222 citation statements)

References 19 publications

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“…The absorption edges values found for Ti, Cr, Co, Zn, Zr, Nb and Sb foils were compared with the values given by Kraft et al (1996). The data evaluation showed that the standard deviation of the Bragg angle was less than 0.002 in the entire energy range indicating an excellent linearity of the monochromator mechanics.…”

Section: Performance Tests By Xafs Spectroscopymentioning

confidence: 91%

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ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

Matz

Schell

Bernhard

et al. 1999

J Synchrotron Radiat

192

116

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The paper describes the Rossendorf beamline (ROBL) built by the Forschungszentrum Rossendorf at the ESRF. ROBL comprises two different and independently operating experimental stations: a radiochemistry laboratory for X-ray absorption spectroscopy of non-sealed radioactive samples and a general purpose materials research station for X-ray diffraction and re¯ectometry mainly of thin ®lms and interfaces modi®ed by ion beam techniques.

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Section: Performance Tests By Xafs Spectroscopymentioning

confidence: 91%

“…At Figure 8 K-edge XANES spectra of metallic Ti, Zr and Sb. The energy scale was calibrated using the edge energies given by Kraft et al (1996). The natural line widths of the Ti, Zr and Sb K shells are 0.94, 3.84 and 9.16 eV, respectively (Krause & Oliver, 1979).…”

Section: Performance Tests By Xafs Spectroscopymentioning

confidence: 99%

ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

Matz

Schell

Bernhard

et al. 1999

J Synchrotron Radiat

192

116

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“…Energies were calibrated using Co and Pt metal foils, with first inflection point at 7708.78 and 11562.76 eV, respectively. 40 All samples were measured at room temperature. The spectra were calibrated, averaged, pre-edge background subtracted, and postedge normalized using standard procedures and custom LabView based software available at the beamline.…”

Section: Methodsmentioning

confidence: 99%

Probing Compositional Variation within Hybrid Nanostructures

et al. 2009

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Ќ These authors contributed equally to this work. P latinum-based bimetallic alloys are highly desirable for their potential in magnetic storage, sensing, and catalysis, 1Ϫ5 often displaying properties that are independent of their constituent materials. 6 In addition to changes in the geometric distribution of the individual atoms, the unique structure and bonding in bimetallics can also lead to alterations in the electronic structure of the material. For example, PtNi alloys show enhanced activity for oxygen reduction relative to pure Pt, 7 as do similar alloys, including Pt 3 Co.8 However, bimetallic nanomaterials are not as well-understood outside of singlecrystalline studies or theoretical modeling, and the practical application of more complex nanostructures is further complicated by factors such as varied growth conditions, the presence of surface stabilizing agents, and the increased surface-to-volume ratio of nanoscale materials. Bimetallic nanoparticles have even been shown to undergo dynamic metal segregation in response to oxidizing or reducing environments. 9As nanostructured systems increase in complexity, the potential for structural and compositional variations with respect to the individual components rises dramatically. Hybrid nanostructures, the combination of two or more nanoscale materials to form a new heterostructure, are being actively pursued for a number of applications, 10 including device integration and assembly, 11Ϫ13 chemical and biological sensing, 14,15 and photocatalysis. 16Ϫ23 In particular, the integration of a metallic component with an optically active semiconductor, directly in solution, can lead to novel materials that exhibit new functionalities that result from the coupling between the individual components. For example, photocatalytic heterostructures can promote efficient charge separation across a metalϪsemiconductor junction, followed by catalytic reaction at the surface of the metal component.The development of semiconductorϪ metal hybrid nanostructures for magnetic and catalytic applications requires a thorough understanding of the metallic structure, which is difficult to predict for a complex system where nucleation and growth proceeds on the tip of a semiconductor. In a previous communication, we reported the selective growth of Pt, PtCo, and PtNi nanoparticles on the tips of CdS rods in solution. 24 Here, we present a detailed analysis of the structural and magnetic properties of PtCoϪCdS hybrid structures in comparison to similar free-standing PtCo nanoparticles. X-ray absorption spectroscopy (XAS) is utilized as a sensitive probe for identifying subtle differences in the local structure and composition of the hybrid materials, which can be difficult to discern using traditional analytical methods such as electron microscopy and X-ray diffraction (XRD). While the electronic and atomic structures of noble metal-based bimetallic alloys and free-standing PtCo

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“…The energy scale was calibrated using the 1st inflection points of Fe, Ni, and Se foils. 25 The magnetic measurements were performed on a commercial SQUID-based magnetometer (Quantum Design MPMS 5XL) over a wide range of temperatures (2-300 K) and applied dc fields (up to 5 T). Zero-field cooling (ZFC) and field-cooling (FC) temperature-dependent magnetization M (T) measurements were carried out in dc mode.…”

Section: Characterizationmentioning

confidence: 99%

Superferromagnetism in chain-like Fe@SiO2 nanoparticle ensembles

Zeleňáková

Zeleňák

Maťko

et al. 2014

Journal of Applied Physics

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Long-range ferromagnetic order induced by a donor impurity band exchange in SnO2:Er3+ nanoparticles J. Appl. Phys. 114, 203902 (2013); 10.1063/1.4833549Role of oxygen defects on the magnetic properties of ultra-small Sn1xFexO2 nanoparticles J. Appl. Phys. 113, 17B504 (2013) One-dimensional (1D) chain-like nanocomposites, created by ensembles of nanoparticles of with diameter 13 nm, which are composed of an iron core (4 nm) and a silica protective layer, were prepared by a self-assembly process. Chain-like Fe@SiO 2 ensembles were formed due to strong magnetic dipole-dipole interactions between individual Fe nanoparticles and the subsequent fixation of the Fe particles by the SiO 2 layers. X-ray near edge absorption spectra measurements at the Fe K absorption edge confirm that the presence of a silica layer prevents the oxidation of the magnetic Fe core. Strong magnetic interactions between Fe cores lead to long-range ordering of magnetic moments, and the nanoparticle ensembles exhibit superferromagnetic characteristics demonstrated by a broad blocking Zero-field cooling (ZFC)/field-cooling distribution, nearly constant temperature dependence of ZFC magnetization, and non-zero coercivity at room temperature. Low room-temperature coercivity and the presence of electrically insulating SiO 2 shells surrounding the Fe core make the studied samples suitable candidates for microelectronic applications. V C 2014 AIP Publishing LLC.[http://dx

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High resolution x-ray absorption spectroscopy with absolute energy calibration for the determination of absorption edge energies

Cited by 237 publications

References 19 publications

ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

ROBL – a CRG beamline for radiochemistry and materials research at the ESRF

Probing Compositional Variation within Hybrid Nanostructures

Superferromagnetism in chain-like Fe@SiO2 nanoparticle ensembles

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