Quantum Confinement Features in EPR and UV-vis Spectra of Al/Au Nanosystems

Автор(ы) V.V. Kislyuk1, A.K. Melnyk2, N.I. Buryak3, V.V. Trachevskij4

1 G.V. Kurdyumov Institute of Metal Physics, NASU, 36, Prosp. Vernadskogo, 03142 Kyiv, Ukraine

2 Institute for Sorption and Problems of Endoecology, NASU, 13, Naumov St., 03028 Kyiv, Ukraine

3 V.I. Vernadskiy Institute of General and Inorganic Chemistry, NASU, 32/34, Acad. Palladina Ave., 03680 Kyiv, Ukraine

4 Technological Center, NASU, 13, Pokrovska St., 04070 Kyiv, Ukraine

Выпуск Том 11, Год 2019, Номер 4
Даты Получено 12 июня 2019; в отредактированной форме 05 августа 2019; опубликовано online 22 августа 2019
Ссылка V.V. Kislyuk, A.K. Melnyk, N.I. Buryak, V.V. Trachevskij, J. Nano- Electron. Phys. 11 No 4, 04036 (2019)
DOI https://doi.org/10.21272/jnep.11(4).04036
PACS Number(s) 73.22. – f, 75.20. – g
Ключевые слова EPR, UV-vis absorption (2) , Confinement (5) , Nanoparticles (70) , Paramagnetism, Superatom.

The composite Al/Au nanosystems synthesized by co-reduction from solution (with tannin and sodium citrate as reducing agent) are studied by electron paramagnetic resonance (EPR) and UV-vis electron absorption spectroscopies. A fine structure revealed in line with g ( 2.062 (associated with particles whose paramagnetism originates from odd number of gold atoms) is attributed to the discrete electronic states of an unpaired electron in a joint electron structure of a polyatomic nanoparticle. This fine structure manifests itself as a sequence of the resonance signals with close values of their g-factors. The UV-vis absorption spectra of the Al/Au nanocomposite solution contain equidistant absorption bands with 0.73-0.7 eV energy differences between the adjacent peaks. These features are attributed to the quantum confinement effects in the Al/Au nanocomposite system. The estimates made on the basis of the experimental data outline the size of the gold containing nanoclusters which in their paramagnetic form are of several nm in diameter.

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