TY - JOUR

T1 - Peculiarities of Structure and Morphology of Copper-Cerium Nanopowders Produced by Laser Ablation

AU - Goncharova, D. A.

AU - Svintsitskiy, D. A.

AU - Stonkus, O. A.

AU - Svetlichnyi, V. A.

AU - Boronin, A. I.

PY - 2020/5/1

Y1 - 2020/5/1

N2 - Copper-cerium nanopowders CuOx–CeO2 (mass ratio Cu:Ce = 6:100) are prepared by mixing the dispersions of the copper and cerium oxides produced by the method of pulse laser ablation (PLA) in liquid, followed by drying. The initial dispersions of copper oxides were prepared by the method of PLA of a metal copper target in distilled water or 1% hydrogen peroxide solution, and those of cerium oxide – by PLA of metal cerium in distilled water. It is shown that ablation of copper in water and water solution of peroxide is followed by the formation of copper oxide particles of different morphologies and compositions (structure). It is established that no crystal phases of copper oxides are formed in the copper-cerium nanopowders produced from separate dispersions. Given this approach to forming copper-cerium nanoparticles, the oxidized copper is distributed in the form of a thin layer on the CeO2 surface, which is demonstrated by the results of investigation of these particles by the methods of high-resolution transmission electron microscopy and X-ray diffraction. The formation of a Cu–O–Ce interface at the interphase boundary gives rise to the formation of defects on the CeO2 surface, which is confirmed by the Raman spectroscopy. An investigation of the composition and electronic structure of the surface of CuOx nanoparticles and CuOx–CeO2 nanopowders performed by the method of X-ray photoelectronic spectroscopy reveals the presence of copper in the form of a combination of Cu (I) and Cu (II) with the prevailing contribution from a single-valence state for CuOx–CeO2 nanopowders, which could have resulted from the interaction between CuOx and CeO2 particles.

AB - Copper-cerium nanopowders CuOx–CeO2 (mass ratio Cu:Ce = 6:100) are prepared by mixing the dispersions of the copper and cerium oxides produced by the method of pulse laser ablation (PLA) in liquid, followed by drying. The initial dispersions of copper oxides were prepared by the method of PLA of a metal copper target in distilled water or 1% hydrogen peroxide solution, and those of cerium oxide – by PLA of metal cerium in distilled water. It is shown that ablation of copper in water and water solution of peroxide is followed by the formation of copper oxide particles of different morphologies and compositions (structure). It is established that no crystal phases of copper oxides are formed in the copper-cerium nanopowders produced from separate dispersions. Given this approach to forming copper-cerium nanoparticles, the oxidized copper is distributed in the form of a thin layer on the CeO2 surface, which is demonstrated by the results of investigation of these particles by the methods of high-resolution transmission electron microscopy and X-ray diffraction. The formation of a Cu–O–Ce interface at the interphase boundary gives rise to the formation of defects on the CeO2 surface, which is confirmed by the Raman spectroscopy. An investigation of the composition and electronic structure of the surface of CuOx nanoparticles and CuOx–CeO2 nanopowders performed by the method of X-ray photoelectronic spectroscopy reveals the presence of copper in the form of a combination of Cu (I) and Cu (II) with the prevailing contribution from a single-valence state for CuOx–CeO2 nanopowders, which could have resulted from the interaction between CuOx and CeO2 particles.

KW - copper oxide

KW - copper-cerium nanopowders

KW - nanoparticles

KW - pulse laser ablation

KW - Raman spectroscopy

KW - X-ray photoelectronic spectroscopy

KW - DECOMPOSITION

KW - CO OXIDATION

KW - CU2O

KW - NANOPARTICLES

KW - DEHYDROGENATION

KW - CLUSTERS

KW - OXIDES

KW - CUO

KW - CATALYSTS

KW - WATER

UR - http://www.scopus.com/inward/record.url?scp=85085372695&partnerID=8YFLogxK

U2 - 10.1007/s11182-020-02014-6

DO - 10.1007/s11182-020-02014-6

M3 - Article

AN - SCOPUS:85085372695

VL - 63

SP - 150

EP - 159

JO - Russian Physics Journal

JF - Russian Physics Journal

SN - 1064-8887

IS - 1

ER -