https://doi.org/10.15407/spqeo5.03.337
Semiconductor Physics, Quantum
Electronics & Optoelectronics. 2002. V. 5, N 3. P.337-341 .
PACS: 68.18.+p, 78.67 Bf
Growth kinetics of PbS nanocrystals
in organo-metallic Langmuir-Blodgett films studied by optical absorption
spectroscopy
Institut for Single Crystals, NAS of Ukraine,
60 prospect Lenina, 61001 Kharkov, Ukraine
E-mail: savin@isc.kharkov.com
Abstract.
Formation and growth of lead sulfide nanocrystals in lead stearate Langmuir-Blodgett
(LB) films are investigated using the optical absorption spectroscopy
method. The kinetics of changes in the concentration of lead ions in different
states formed during the growth process, as well as the evolution of the
nanocrystal average size versus growth time, are studied. Irrespective
of the primary Pb2+ ion concentration
in films, found was a nonlinear dependence of the nanoparticle growth
rate vs time: at the initial stage the growth rate is higher than at the
final one. The idea of diffusive decomposition of solid solution is used
to analyze the experimental results. It is shown that high concentrations
of metal ions at the interfaces of LB-film monolayers as well as diffusion
restrictions of mass-transfer process play a decisive role in the formation
and growth of nanocrystals in ordered organic matrixes.
Keywords: lead
sulfide nanoparticles, Langmuir-Blodgett films, growth process, optical
absorption.
Paper received 13.11.02; accepted for publication
10.12.02.
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