Abstract
Synthesis of nanoparticles doped with various ions can significantly expand their functionality. The conditions of synthesis exert significant influence on the distribution nature of doped ions and therefore the physicochemical properties of nanoparticles. In this paper, a correlation between the conditions of synthesis of manganese-containing cadmium sulfide or zinc sulfide nanoparticles and their optical and magnetic properties is analyzed. Electron paramagnetic resonance was used to study the distribution of manganese ions in nanoparticles and the intensity of interaction between them depending on the conditions of synthesis of nanoparticles, the concentration of manganese, and the type of initial semiconductor. The increase of manganese concentration is shown to result in the formation of smaller CdS-based nanoparticles. Luminescent properties of nanoparticles were studied. The 580 nm peak, which is typical for manganese ions, becomes more distinguished with the increase of their concentration and the time of synthesis.
Highlights
The synthesis of semiconductor nanoparticles such as quantum dots (QDs) with desired properties is among the most rapidly developing areas in the chemistry of nanoparticles
The optical and electron paramagnetic resonance (EPR) spectroscopy methods used to study correlation between the structural features of quantum dots doped with Mn ions and their synthesis conditions
The luminescence spectra of CdS-based nanoparticles have a peak at 580 nm typical for manganese ions, which becomes more distinguished with an increase of their concentration and the time of synthesis
Summary
The synthesis of semiconductor nanoparticles such as quantum dots (QDs) with desired properties is among the most rapidly developing areas in the chemistry of nanoparticles. The quantum confinement effect in nanocrystals allows for the fabrication of materials with various properties from identical precursors just by changing reaction conditions [1]. The presence of doped ions in semiconductor nanocrystals provides them with additional energy levels and, exerts significant influence on the optical and magnetic properties of the quantum dots [5,6]. The location of dopant ions (individual ions in a QD matrix or on the surface of nanoparticles or ions in an aggregated form) contribute to different optical and magnetic properties of the nanoparticles [7,8,9,10,11]. A relevant problem is the Photonics 2019, 6, 107; doi:10.3390/photonics6040107 www.mdpi.com/journal/photonics
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