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Polymer Nanocomposite Containing Palladium Nanoparticles: Synthesis, Characterization, and Properties

纳米复合材料 材料科学 表征(材料科学) 聚合物 纳米颗粒 高分子化学 聚合物纳米复合材料 化学工程 高分子科学 复合材料 纳米技术 有机化学 化学 催化作用 工程类
作者
G. Yu. Yurkov,Yury A. Koksharov,A. S. Fionov,N. A. Taratanov,В. В. Колесов,V. E. Kirillov,Mstislav Makeev,Pavel Mikhalev,Dmitriy S. Ryzhenko,V. I. Solodilov
出处
期刊:Polymers [Multidisciplinary Digital Publishing Institute]
卷期号:14 (18): 3795-3795 被引量:6
标识
DOI:10.3390/polym14183795
摘要

Composite nanomaterials have been prepared through thermal decomposition of palladium diacetate. The composite contains palladium nanoparticles embedded in high-pressure polyethylene. The materials were studied by a number of different physico-chemical methods, such as transmission electron microscopy, X-ray diffraction, X-ray absorption spectroscopy, electron paramagnetic resonance, and EXAFS. The average size of the nanoparticles is 7.0 ± 0.5 nm. It is shown that with the decrease of metal content in the polymer matrix the average size of nanoparticles decreased from 7 to 6 nm, and the coordination number of palladium also decreased from 7 to 5.7. The mean size of palladium particles increases with the growing concentration of palladium content in the matrix. It is shown that the electrophysical properties of the material obtained depend on the filler concentration. The chemical composition of palladium components includes metallic palladium, palladium (III) oxide, and palladium dioxide. All samples have narrow lines (3–5 Oe) with a g factor of around two in the electron paramagnetic resonance (EPR) spectra. It is shown that EPR lines have uneven boarding by saturation lines investigation. The relaxation component properties are different for spectral components. It leads to the spectrum line width depending on the magnetic field value. At first approximation, the EPR spectra can be described as a sum of two Lorentzian function graphs, corresponding to the following two paramagnetic centers: one is on the surface, and one is inside the palladium particles. Some of the experimental characteristics were measured for the first time. The data obtained indicate interesting properties of palladium-based nanocomposites, which will be useful for obtaining products based on these materials.

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