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

Authors 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

Issue Volume 11, Year 2019, Number 4
Dates Received 12 June 2019; revised manuscript received 05 August 2019; published online 22 August 2019
Citation 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
Keywords 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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