TY  - JOUR
AU  - Timoshenko, Janis
AU  - Anspoks, Andris
AU  - Kalinko
AU  - Kuzmin, Alexei
TI  - Local structure of nanosized tungstates revealed by evolutionary algorithm
JO  - Physica status solidi / A
VL  - 212
IS  - 2
SN  - 1862-6300
CY  - Weinheim
PB  - Wiley-VCH
M1  - PUBDB-2015-03405
SP  - 265 - 273
PY  - 2015
AB  - Nanostructured tungstates, such as CoWO<sub>4</sub> and CuWO<sub>4</sub>, are very promising catalytic materials, particularly for photocatalytic oxidation of water. The high catalytic activity of tungstate nanoparticles partially is a result of their extremely small sizes, and, consequently, high surface-to-volume ratio. Therefore their properties depend strongly on the atomic structure, which differ significantly from that of the bulk material. X-ray absorption spectroscopy is a powerful technique to address the challenging problem of the local structure determination in nanomaterials. In order to fully exploit the structural information contained in X-ray absorption spectra, in this study we employ a novel evolutionary algorithm (EA) for the interpretation of the Co and Cu K-edges as well as the W L<sub>3</sub>-edge extended X-ray absorption fine structure (EXAFS) of nanosized CoWO<sub>4</sub> and CuWO<sub>4</sub>. The combined EA-EXAFS approach and simultaneous analysis of the W L<sub>3</sub> and Co(Cu) K-edge EXAFS spectra allowed us for the first time to obtain a 3D structure model of the tungstate nanoparticles and to explore in details the effect of size, temperature and transition metal type.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000349699400007
DO  - DOI:10.1002/pssa.201431561
UR  - https://bib-pubdb1.desy.de/record/223984
ER  -