Abstract:
The effects of pH value and precursors concentrations in the
growth solution as well as of ultrasound irradiation on the
properties of CdS:Mn nanoparticles in PVA matrix are studied.
Analysis of the photoluminescence spectra indicates that
the increase of the pH value in the growth solution leads to
the increase of the density of surface electron states that participate
in radiative transitions and to the enlargement of
CdS:Mn nanoparticles.We discuss a stabilization of the sizes of CdS:Mn nanoparticles
at pH=6 and change of nanoparticle size with decreasing
pH value at elevated concentrations of ions HS- . It is shown
that in the ultrasound-treated samples the size of the particles
does not depend on pH value. The effects of ultrasound result
primarily from acoustic cavitation. It is demonstrated that the
action of two external factors (the value of the medium pH
and ultrasound treatment) on the characteristics of nanoparticles
is correlated.
