Quantum Size Effect in Bimetallic Nanoparticles Obtained via Thermolysis of Solid Solutions of Co(II), Ni(II), Zn(II) Salts of Maleic Acid

L. I. Yudanova, V. A. Logvinenko, A. V. Ishchenko, N. A. Rudina

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

Powder X-ray diffraction and the thermoanalytical characteristics of solid solutions with compositions [(CoxNi1 – x)(H2O)4(C4H3O4)2], [(CoxZn1 – x)(H2O)4(C4H3O4)2], [(NixZn1 – x)(H2O)4(C4H3O4)2] (0 < x < 1) are compared. The decomposition of solid solutions and their constituents when heated to 500°C in a flow of He is conventionally divided into three stages. Products of the thermolysis of solid solutions are found to be Co/Ni, Co/ZnO, and Ni/Zn bimetallic nanoparticles, respectively, embedded into the polymeric matrix of composites. It is shown that the thermal decomposition of solid solutions in the Curie curve upon a second order phase transition with the formation of the two-phase region found in Co/Ni bimetallic nanoparticles is a quantum size effect. The decomposition of [(Co0.1Zn0.9)(H2O)44H3O4)2] solid solution removes the Co atoms (d = 2.5 Å) embedded in channels of the ZnO structure. These atoms also serve as catalysts for the growth of a nanobrush of carbon nanotubes (CNTs) on the composite’s surface at ≤500°C, another consequence of the quantum size effect. It is concluded that using a similar catalyst of CNT growth can appreciably lower the energy of the process.

Язык оригиналаанглийский
Страницы (с-по)2108-2114
Число страниц7
ЖурналRussian Journal of Physical Chemistry A
Том94
Номер выпуска10
DOI
СостояниеОпубликовано - 1 окт 2020

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