Ion-beam synthesis of zinc-based nanoparticles in SiO2

Karolina Czarnacka; Maksim A. Makhavikou; Fadei F. Komarov

doi:10.1117/12.2243262

14 December 2016 Ion-beam synthesis of zinc-based nanoparticles in SiO₂

Karolina Czarnacka, Maksim A. Makhavikou, Fadei F. Komarov

Proceedings Volume 10010, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VIII; 100100B (2016) https://doi.org/10.1117/12.2243262
Event: Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies 2016, 2016, Constanta, Romania

Abstract

In this paper production process of Zn nanocrystals in SiO₂ by using an implantation of high dose zinc ions with energy of 130 keV and annealing process in 700°C were described. Using electron microscopy was established that annealing causes extension of admixtures distribution on depth and zinc nanoparticles size increasing from approx. 1 - 6 nm to 12 - 18 nm.

For prepared material AC conductivity measurements were made in temperatures range from liquid nitride temperature (LNT) to 373 K and at frequencies range from 50 Hz to 5 MHz. Strong frequency dependence on conductivity proves that in this nanocomposite Zn-SiO₂ conduction takes place by electron hopping exchange (tunneling) between metallic phase nanoparticles.

It was established that three activation energies of conductivity occurs in temperatures range of LNT – 373 K – in low temperatures ΔE₁≈0.001 eV, in medium temperatures ΔE₂≈0.025 eV and in higher temperatures area ΔE₃≈0.096 eV. This is due to the presence of at least two types of nanoparticles. First there are zinc nanoparticles with zinc oxide coating, second there are nanoparticles without the coating. The highest activation energy occurs during electrons tunneling between nanoparticles with zinc oxide coating. Intermediate activation energy corresponds to tunneling from nanoparticle with coating to nanoparticle without coating or conversely. The lowest activation energy corresponds to electrons hopping between nanoparticles without coatings.

Citation Download Citation

Karolina Czarnacka, Maksim A. Makhavikou, and Fadei F. Komarov "Ion-beam synthesis of zinc-based nanoparticles in SiO₂", Proc. SPIE 10010, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VIII, 100100B (14 December 2016); https://doi.org/10.1117/12.2243262

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