Abstract:
Four ZnS nanopowders containing an uncontrolled impurity of manganese
were studied using EPR technique. The powders with the average sizes (6...8 nm)
were synthesized by either joint or sequential decomposition of diethyldithiocarbamate
complexes of zinc and europium in high-boiling solvents at various temperatures.
All samples demonstrated the EPR signal that is not typical for ZnS powders with
μm-sized particles. Computer simulation showed that EPR spectra of all the samples
could be fitted by two components.
The ratio of centers
amounts Mn2+(C)/Mn2+(D) for the samples studied was 2.1/1 (in the samples 1 and 4) and
1.7/1 (in the samples 2 and 3), respectively. EPR of Mn2+ ions was shown to be an effective
method for detecting planar lattice defects in ZnS nanoparticles.
