Journal ArticleDOI
EXAFS and XANES investigation of (Li, Ni) codoped ZnO thin films grown by pulsed laser deposition
Lorenzo Mino,Diego Gianolio,Fabrizio Bardelli,Carmelo Prestipino,E. Senthil Kumar,F. Bellarmine,M. Ramanjaneyulu,Carlo Lamberti,M. S. Ramachandra Rao +8 more
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TLDR
Preliminary investigations on the Zn K-edge of the undoped and doped ZnO thin films revealed that doping has not influenced the average Zn-Zn bond length and Debye-Waller factor, which shows that both Ni and Li doping do not appreciably affect the average local environment of Zn.Abstract:
Ni doped, Li doped and (Li, Ni) codoped ZnO thin films were successfully grown using a pulsed laser deposition technique. Undoped and doped ZnO thin films were investigated using extended x-ray absorption fine structure (EXAFS) and x-ray absorption near edge spectroscopy (XANES). Preliminary investigations on the Zn K-edge of the undoped and doped ZnO thin films revealed that doping has not influenced the average Zn–Zn bond length and Debye–Waller factor. This shows that both Ni and Li doping do not appreciably affect the average local environment of Zn. All the doped ZnO thin films exhibited more than 50% of substitutional Ni, with a maximum of 77% for 2% Ni and 2% Li doped ZnO thin film. The contribution of Ni metal to the EXAFS signal clearly reveals the presence of Ni clusters. The Ni–Ni distance in the Ni0 nanoclusters, which are formed in the film, is shorter with respect to the reference Ni metal foil and the Debye–Waller factor is higher. Both facts perfectly reflect what is expected for metal nanoparticles. At the highest doping concentration (5%), the presence of Li favors the growth of a secondary NiO phase. Indeed, 2% Ni and 5% Li doped ZnO thin film shows %Nisub = 75 ± 11, %Nimet = 10 ± 8, %NiO = 15 ± 8. XANES studies further confirm that the substitutional Ni is more than 50% in all the samples. These results explain the observed magnetic properties.read more
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Low-dimensional systems investigated by x-ray absorption spectroscopy: a selection of 2D, 1D and 0D cases
Lorenzo Mino,Giovanni Agostini,Elisa Borfecchia,Diego Gianolio,Andrea Piovano,Erik Gallo,Erik Gallo,Carlo Lamberti +7 more
TL;DR: X-ray absorption spectroscopy (XAS) is a powerful tool for the characterization of such kinds of systems, owing to its chemical selectivity and high sensitivity in interatomic distance determination as discussed by the authors.
Journal ArticleDOI
Amorphous Ni–Fe–Mo Suboxides Coupled with Ni Network as Porous Nanoplate Array on Nickel Foam: A Highly Efficient and Durable Bifunctional Electrode for Overall Water Splitting
TL;DR: A high‐performance bifunctional electrode formed by vertically depositing a porous nanoplate array on the surface of nickel foam is provided, where the nanoplate is made up by the interconnection of trinary Ni–Fe–Mo suboxides and Ni nanoparticles.
Journal ArticleDOI
Materials characterization by synchrotron x-ray microprobes and nanoprobes
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How does a silar cdse film grow? Tuning the deposition steps to suppress interfacial charge recombination in solar cells
TL;DR: Step-by-step SILAR deposition of CdSe films on mesoscopic TiO2 nanoparticle films is analyzed using X-ray absorption near-edge structure analysis and the interfacial structure of these films is probed.
Journal ArticleDOI
Effect of (Li, Mn) co-doping on structural, optical and magnetic properties of chunk-shaped nano ZnO
TL;DR: In this paper, a chunk-shaped ZnO nanostructures (CSNS) simultaneously doped with Li and Mn for varying Li/Mn concentrations have been synthesized using wet-chemical method.
References
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TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
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ATHENA, ARTEMIS, HEPHAESTUS: data analysis for X-ray absorption spectroscopy using IFEFFIT.
Bruce Ravel,Matthew Newville +1 more
TL;DR: A software package for the analysis of X-ray absorption spectroscopy (XAS) data is presented, based on the IFEFFIT library of numerical and XAS algorithms and is written in the Perl programming language using the Perl/Tk graphics toolkit.
Journal ArticleDOI
Zener Model Description of Ferromagnetism in Zinc-Blende Magnetic Semiconductors
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Journal ArticleDOI
Kinetics and kinematics for translational motions in microgravity during parabolic flight.
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Journal ArticleDOI
Making Nonmagnetic Semiconductors Ferromagnetic
TL;DR: The magnetic coupling in all semiconductor ferromagnetic/nonmagnetic layered structures, together with the possibility of spin filtering in RTDs, shows the potential of the present material system for exploring new physics and for developing new functionality toward future electronics.
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